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Патент USA US2133073

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Oct. 11, 1938.
R. BECK ET AL
2,133,073
METHOD OF‘ AND APPARATUS FOR CONTROLLING PRESSURE FLUID
Filed Deb. 30, 1935
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RBECK ET AL
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2,133,073
METHOD‘ OF AND APPARATUS FOR CONTROLLING PRESSURE FLUID
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Oct. 11, 1938.
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R, BECK ET AL
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2,133,073
METHOD OF ANIZ APPARATUS FOR CONTROLLING PRESSURE FLUID
Filed Dec.- 50, 1935
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‘Oct. 11, 1933.
R. BECK ET AL
2,133,073
METHOD OF AND APPARATUS FOR CONTROLLING PRESSURE FLUID
Filed Dec. 50, 1935
2%»?
5 Sheets-Sheet 4
2,133,073
Patented Oct. ll, 1938
+
UNITED STATES
"PATENT - OFFICE ; ‘ '
2,133,073. r
.
VMETHQD' OF AND APPARATUSY‘FOR CON
~
"
TROLLING PMRESSUKEVFLUID
‘
Rudolf . Beck and James Briscoe, Bridgeport,
Conn, assignors, by mesne assignments, to
Manning,‘ Maxwell .& Moore, Incorporated‘,
' New York, N. Y._, a corporation of ‘New Jersey
_ Application December 30, 1935, semi No. 56,658
'
11 Claims.’ (or. 137-521) _
'
This invention pertains; to [a method of and proved valve means designed to respond to varia
apparatus’ for regulating and controlling thev ' tions in. temperature‘rather. than. variations in
pressure. of the working ?uid and by such re
sponselto open-‘a relief valve on the superheater;
it provides :fonsuch. control of‘ the relief valve
pressure fluid in a system embodying ?uid pres
sure generators or other: containers, for example,
5. boilers, superheaters, or oil. stills, the present
“without-recourse toi'electrical apparatus; and
application for Letters Patent being. a continua
tion-in-part- of our copending application Serial.
No, 111,162, ?led February .14, 1934, now Patent
provides control valve means‘ of sensitive type
including a control valve" or valves designed. au
made manifest; intheemore detailed description, -
tomatically t‘opopen and. close ‘in response to 'a
predeterminedenergy characteristicof the pres
sure: fluid,.speci?cally to :the temperature of the
?uid. In the patenttolCarl H. Graesser, No.
thermal motor means comprising a motor element
(for example, a bimetallic couple) which is sensi 15
buts'o devisedas to be‘capable of withstanding
No; 2,059,722,-granted. Nov. 3, 1936., In its more‘ ‘ exposure to high temperature and‘pressure with
10’
1'
speci?c aspects the invention is concerned with’ out‘ substantial-injury. ,- ,
, Withthese- and‘ other. objects which will be
a novel arrangementandconstruction of valves,
the invention comprises, among other things,
tively »_resD,0nsive_ ' to 7 temperature, change and
1,951,049, dated March 13, 1934,~there is disclosed
and. broadly claimed a pressure'system' of the
which, by- responding to- a predetermined tem
perature ‘condition, opens- or permits ‘to closev
kind ,tol'which the presentyinvention relates and. ‘ a. valve which controls a ?uid passage. This con-v
20
trolgvalve may, for example, be employedv ‘for
controlling‘, (directly or indirectly)’ theQperation
.Under certain conditions ofmodern steam, pracr of» a main relief valve of the pressure-loaded type
tic'e,,_ as well as in. other situations,’ very high having aback pressure chamber provided with, a
temperatures and pressures are encountered. L restricted inlet—the thermally responsive con
which the present invention is‘ a speci?cime
provement.
Y
,
'
f
20
_
Whilemost automatic relief or safety valves. open , trol- valve making it readily possible to obtain a 25
and close in- response'to variations" in‘pressure‘ ' very ‘low blowidown, of the, main relief valve
_‘
in the ?uid, there are some-"situations in which withou-t sacri?ce of capacity.
In the ‘accompanying drawings, ‘herein we
abnormal temperature rise. is vmorev important
have illustrated ‘one desirable embodiment of the
than an excess pressure'in- determining the open.
3.9
30 ingot the relief, valve. Such a situation is ‘found, invention by way of example,- _
,
isa vertical section illustrating one type _
for example, in the operation of steam super
' heaters, wherein the pressure ?uid in the super-l ' oi thermally responsive valve device useful di
rectlyiuponthesuperheater;, or other container '
heater does not follow the ordinary pressure-tem
perature relation for a saturated vapor, and -
35 ' wherein, unless proper precautions beftaken, the
temperature may rise to a point at which the"
metal wall-s of the-superheater may soften and
yield. It is'manifest, that in dealing with steam
at. the high ‘pressure now commonly generated,
40
and particularly when the steam is superheated,
it'is very desirable to employ a safety or relie'ffv
valve having a low blowdown, since excess blow-'
down under such conditions means, the loss. of
‘great quantities of heat'energy.
'
1
'
in which veryhi'glrtemperaturesare encountered;
Fig, 251558,, plan‘ viewao-f the device of Fig. .1,
with the..casing'in;section on line 2-2 of Fig. 1;
35
and with certain parts broken away; _
..Fig, 3 is an. end elevation, partly broken away
and in vertical section, looking form the right
,hand, side. of Fig. 1;
,
‘
'
40
' Fig. 4 is a vertical section illustrating a highly ,
sensitive form of thermally responsive valve de~
vice useful, iorexample on a steam generator
drum, where the temperatures are not as great
The di?icu-lties encountered in attempting to
as are encountered on a superheater;
provide a pressure responsive relief valve of
i Fig.‘ 5'is a, section on line 5—5 of
I
4;
6' isra'rvertical section, through a relay
large capacity and low lolowdown,v capable of
valve deviceuseiul in association with the valves
working under present-day pressures and tem
'
>
peratures, are well known to those skilled. ‘in' of Figs. land 4;
Fig.7 is a vvertical section illustrating one de—' 501
50-, the art, and to avoid these dif?culties, it is__pro—
' posed, in accordance with the-present invention! sir-‘able type of pressure loaded relief or, main
employ thermally responsive ‘means, rather safety valverdesigned for-‘association with and to
' than pressure responsive means, in controlling‘ be controlled in its operation by the valve means
.~
I
i
I
the pressure ?uid in the system. vVlliththis ob— (if-Fig.1;
ject in view, the present invention provides im
871s“; diagrammatic view illustrating a
2
aisaove
boiler and superheater provided with a vset of
' valves such as illustrated in Figs. 1, 4, 6 and
;
Fig. 9 is a diagrammatic view to larger scale;
Fig. 10 is a view similar to Fig. 1 but illustrat
ing a modi?ed and preferred ‘form of thermally
slot in its upper edge for the reception of the end
of a ?exible motion-transmitting element l8.
This element may, for example, consist of a piece
of thin spring steel ribbon, its lower end being
permanently united to the plate It by brazing or
valve;
,,
a
‘
the like, or by clamping screws or other suitable
Fig. 11 is'a fragmentary vertical section, to _ fastening connectionsi The ?exible element [8
smaller scale, on the tine ll—| l' OfFig. 10; and. ‘passes up and around an arcuate surface 20 at
Fig. 12 is a diagrammatic view illustrating the the left-hand end (as viewed in Fig. 1) of a
responsive
'10 use of the device of. Fig. 10 for‘the control of a
This rocker may consist of a casting, 10
or may be otherwise shaped in any appropriate
In the drawings, Figs. 1 rand_2 illustrate one , way'from suitable material, and has at its under
desirable form of control valve Z. In these views, side a pocket for the reception of a ball 22. This
the numeral l designates a portion of; the shell of ball may be of'hard steel, such for example as a
15 a boiler,isuperheater, oil-still or other receptacle ,bearing,baILand'preferably rests upon a wear
or container for pressure ?uid. This shell has an resistant plate 23, for example, of nitrided or
internally screw-threaded opening for the recep
other hard'steel or the like disposed in a suitable
tion of the screw-threaded nipple 2 having the en
slot or groove in a crossbar 24, which is secured to
larged head portion 3. When employed in high’ the upper edge of a Web 25 forming a part of the
20 pressure installations, the screw-threaded part 2
bottom member of the housing. The transverse, 20
may obviously‘ be‘ replaced by a standard ?ange stiifness of the steel ribbon l8 prevents lateral
relief valve.
'
integral with the head portion 3. The head 3 of
the nipple is hollow ‘and is furnished with an'in
tcrnal- conical seat surface 4 designed to make a
?uid-tight joint with a similar conicalsurface at
the lower of a sleeve 5. ~
' rocker 2|.
>
sleeve is, provided
with a shoulder at 6 for engagement by the inner.
tilting of the part 2| on the single point support
provided by ball 22;.
‘
~
, The rocker 2| supports one end' of a lever 26
which is of resilient material, such as spring steel. 25
The upper part of the ?exible transmitting mem
ber !8, after passing over the arcuate surface 20,
is turned down onto the upper surface of the upper
'endof a bushing -1 having screw-threaded en-'
gag'ement with the threaded inner wall of the nip _ end portion of lever 26, and the several parts are
ple head 3. _ By means of this bushing 'l'the sleeve ‘?xedly united to therocker 2| by‘ means of a 30
5 may be clamped down ‘in steam-tight relation to clamping plate 27 and bolts 28;
<
the seat surface '4 of the member 3.
The free extremity of thelonge'r arm of‘lever
'At its lower end the sleeve‘ 5 is furnished with l
3.5
2 = is preferably disposed
a substantially hori
a recess which receives'the upper end of ‘a tube 8. ' zontal plane, under normal conditions, as shown
The ‘upper 'end 'of-this tube is‘ ‘?xed within the
at 28, and is supported or limited in‘its downward -
recess, for example‘ by welding, brazing, screw, ' movement by an adjustable stop member 30 hav
threading, or in any other desired manner. This
. sleeve 8. extends downwardly through the nipple
, 2, and into the .pressurel-?uid 'space’of the super
40. heater or other receptacle, and at its lower end is'
?xedly'united to a'rod 9. ‘This rod maybe sel
cured to thetube 8 at itslower end by means of
"wleding, brazing, or other appropriate connecting
' means, and the rod extends up through the sleeve
ing screw-threaded engagement withia boss 3| projecting up from the member , l3.
Near its free
end, the lever 28 is furnished with an internally
screw-threaded sleevemember 32 having a sub 40
stantially vertical axis and which receives an 'ad-- '
justable contact member
‘ This contact mem
ber is disposed immediately beneath and normally
engages the lower end of a valve lifter member 34,
45 5 and projects from the upper end of the latter; _ which extends ‘downwardly from the control or
passing through an annular guide ?ange I l at the ’
‘ upper end ,of the sleeve" 5. The tube 18 and the
rod!) are made of matcn'alsfor'example,‘bronze
exhaust valve feather 35. This valve. feather
comprises a hollow body portion 35 which receives
the lower end of arval‘ve loading’ rod
This
and steel, ‘respectively, having‘ quite different co-v ioadingrodis preferably furnished with a pair of
'50 efficients of expansion in response to temperature" cylindrical enlargements 38 adapted to slide With‘?
change. The tube 8 has av higher c'oe?icient than 7 a vertical bore in 'a' guide cap 39, the upperqend
the rod 9, so'. thatwhen these parts‘ are subjected‘ of which houses the valve loading spring 40, one
V ' to increasing temperature. the different rates. of '
end of. which bears against the-inner surface of .
expansion of‘ the tube 8_ and the rod 9l‘causes the
rod 9 'to' move bodily downward,$"while: decrease
the cap'and the other end of which bears onthe
upper ‘end of‘thev loading rod 38.4 Since the lever
' in temperature causes a reverse movement, the
arm to which the movement of the member I8 is
parts 8 and 9 thus constituting arthiermal motors vapplied is relatively short, such movement is mul
Theupper end of thesleeve 5 has a screw
threaded engagement with an opening in a down
60 wardly directed boss [0, preferably forming ‘an
integral part of the’ lower wall [3 of the housing
' of a control valve Z.
This housing may be made
tiplied as applied to the valve lifter 34.
The cap 39 is screw threaded at its lower'end
and engages a threaded opening in the valve block 60
4|, which is removably secured in place by‘means
of bolts Ma. ‘The cover'member I4 is secured
' g of any suitable material, for example cast-iron or to the block by a screw 42. This blockis fur
bronze, and comprises'the' cover member M which 'nished with a chamber vt3 communicating by
is removable from the base portion.
7
,
g _
The upper end of the rod 9,,is screw threaded
and has screwethreaded engagement with a screw
means of- a passage 44 with‘a screw-threaded
socket adapted to receive the screw-threaded
end of a pipe 45,leading from a sourceof supply 3
threaded bore in a block l5, a lock nut’ l5a being of pressure ?uid as hereinafter more 'fully
provided for retaining the parts in assembled relaé 70?‘ tion. The'block I5 is vfurnished with a slotat its ‘I ‘The lower part of the block 4| is furnished with
described.
7 upper end and this slot receives a plate l6 which
is preferably‘held in assembled relation to the
block l5 by means of a cotter pin ll passing
through aligned holes in the block- Hand in the”
75: plate l6, This piate I6 is also furnished with a
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a
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V
'
.
-
a screw-threaded bore axially aligned with the
opening whichreceives the cap 39, and this bore;
receives the screw-threaded sleeve-like upper part
46 of a valve seat member, which is furnished near
its lower end with the annular seat surface 43 75
3
2,188,078
with which the valve feather 35 normallyvco-i
operates.‘ When seated, the valve feather ‘closes
the passage through the valve seat which con
nects the chamber 43 with an exhaust passage 49.v
Ul
s’ioned that when. pressure ?uid, entering. through
the passage 52, ?lls the space 53, a portion of it
enters through the bleeder opening BI and ?lls
the space 62 and exerts a somewhat greater pres
The passage 49 extends transversely through a
sure on the upper side- of the valve feather than
member 48, preferably a casting, which may The ' "
is exerted :by ‘,the‘?uidin'the space 53 against the
secured within the housing by means of the afore
lower side of the valve feather. The valve feather
mentioned bolts Ma, the exhaust passage“ lead ‘ is thus normally held against its seat by the pres-- '
ing out to one side of the housing and terminating ‘sure ?uid alone, so that no springs or other load
for example at the point 50 (Fig.1 2) .
, -
If thisrcontrol valve device Z. thus far described,
ing‘means ‘are necessary. However, if the pres 10
sure in the chamber 52 be relieved, as by allowing
be employed as the relief valve proper, the pipe
pressure ‘?uid to flow rapidly therefrom, then the
' . 45 may then extend directly to the'boiler or other.
effective pressure on the upper side of the valve
container for the pressure ?uid. However, for
the purposes above mentioned, we prefer to em-v
ploy the valve heretofore described merely as a
becomes less than that on the lower side, and .
15
the valve opens very quickly to full capacity.
‘ "' The generator Gimay be provided with a safety
control valve to determine the opening and clos-V valve or valves T-of usual type. As here shown, it
ing of a relief valve of large capacity, and pref- 1 isgl‘also furnished with a ‘control valve-K which,
in certain details is'somewhat di?erent from the
erably of the pressure loaded type.
In'Fig. 8 we have illustrated one desirable ar» ‘
tail in Figs. 4 and 5.
from the outlet end ofa superheater S to a main
portion 65 and a removable cover 61. The bot
tom of the casing has downwardly directed hol
M. The superheater receives. pressure fluid from
20.
control ‘valve Z1. The valve K is illustrated in de
rangement wherein the‘valve device Z just: de
scribed is mounted on a delivery ‘pipe D leading
”
"This valve‘ K comprises a casing having a body
25
a generator 'G, for * example, a steam boiler,‘ ‘ low boss or .nipple 68 which may have a screw
through a pipe P leading from a'header H‘ ‘con-.
thereaded portion’ adapted to be screwed into a
screw-threaded opening in 'a‘boiler shell S .(Fig.'
pipe is furnished withQa relief valve V’ of large’ 4) or which’ may comprise an integral ?ange
nected to the boiler. ‘ As here‘shown, the delivery
member 69 (Fig. 8) adapted to be secured to a
In Fig. 7 we have illustrated, by way of ex-" ?tting‘ 10 mounted on the shell of the generator‘
ample, one desirable formof relief valve.~This G. ‘The’ nipple 68 has an axial bore ‘H opening
valve V comprises a casing having a ?ange 5|; into the pressure ?uid space in the generator‘ and
is provided‘ with a branch 12‘ at its upper end
by means of which it may be attachedto a suit‘
able ?tting on pipe D. A passage 52~concentric ‘which leads into the chamber or space "within
capacity and of the pressure loaded type. .. a
- with ?ange 5| leads up into a chamber 53 within»
the body of the casing. A transverseweb 54 ex-‘
tends through the chamber 53 and supports a
sleeve provided with vthe annular valve seat 55
surrounding the passage 56, which in turn opens.
into the exhaust passage 51 formed in the part,
within the web 54,-and which extends laterallyouti
40
the body of the casing of’ the valve K. At the
upper end of the bore ‘H. an annular ?ange ‘H
constitutes a support for the upper end of a tube
15 whichpasses-freely down through the bore ‘H .
The upper end‘of'the tube is ?xedly secured, as
by brazing, screw-threading, or the like, to the
?ange 14.
Within this tube is arranged a rod '
to one side of the casing, where it'may open to '16‘ which- extends ~freelyithrough the‘ tube but
the atmosphere or be continuedthrough any suit-' which'is securely united. to the lower end of the
able pipe or conduit to a desired’ pointof-dis» tube T5 at the point 11 by means of brazing, screw
~ ‘threading, orthe like.’ The parts 15 and 16,'as
thus“'arranged, constitute a bimetallic thermo
an annular guide sleeve 58 of somewhatlargerq. static, device, the tube ‘I5 ‘being of a material
charge.
,
'The upper part of. the casing is furnishedewith
internal diameter than passage ‘ 5V5-and which‘ which expands more rapidly,‘ when‘ heated, than
may, if desired, be of some wear-resistant mate‘ does‘the material of the rod 16. These parts may
rial and accurately machined toprovide aproper. be made of the same materials mentioned as use
sliding contact with the-hollow'skirt‘ portion 59. ful in the construction of'the‘bimetallic thermo
of the combined piston and valve feather 6'5.~ jstatr8, Sof the device of Fig. I.
e‘
a
The rod 15 projects up into the chamber 13 of
peripheral surface adapted'to make steam-tight; thecasing and has attached thereto a transverse
contact with the vseat 55. The interior of the substantially horizontal bar 18' (Fig; 5'). At its
. vskirt portion of the valve feather, together with opposite'ends this‘ bar carries a pair of spacer
the upper part of. the casing,'forms a chamber 52 sleeves ‘I9 ‘which support a-yoke member 80, the
for pressure ?uid above the ,valve .65, the space parts being united by bolts 81 passing through
This skirt portion of the valve feather hasia>
52 constituting aback pressurechamber whose I the- sleeve '19 and havingscrew-threaded engage
60
lower wall is movable. A restricted bleeder pas-V’
V sage 6| leads through a wall of this chamber,‘
ment with the bar 18. The yoke member 851s
furnished with’ a screw-threaded opening which
receives a'bolt 82' having‘ a head 83.v This head
from the space 53. The valve casing is furnished“.
with a cover 53 suitably secured'vby'bolts. (not ?ts within a socket 84 similar to that of asocket
wrench, the socket 84 having _a stem 85 provided
shown), andthis cover has a passage ‘34' com
municating‘at one end with the back pressure with a polygonal head 85‘ adapted’ to receive a
chamber 62. The cover is also furnished with a -Wrench or other tool whereby the stem with its ‘
boss $3a having a pair of screw-threaded sockets ,
socket maybe turned. The stem 85 passes up
65 and 65a communicating with the passage 64.
through a- stu?inggbox in a ‘hollow. boss 81 pro
The socket 65 receives the screwéthreaded end of '
jecting from the cover 51, such stuffing box in
cluding a glandwliav adapted‘ to compress suitable '7
such as 6! through a Wall of the chamberythe' packing material to prevent leakage of pressure
valve skirt 59 may be made loose ‘enough to pro-1 fluid longitudinally of the stem. ‘A cap 89, which
vide a Very narrow annular leak passage between . may besecured- in place by 'a'wire seal passing
the pipe 45. Alternatively,-instead ofva passage
it and the guide sleeve 58.
.75
’
. 1*
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The valve parts are so designedi-anddim‘en- .
vthrough opening 90, normally houses the upper
endofthestem85.;~
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2,133,073
, The inner wall of the body 96 of the casing is
furnished with a ledge at 9I ‘having a recess
justing screw I I I, ma. threaded bore in the lower
end of head I96. The head of screw III is dis
which receives two bearingballs 92 spaced apart
less than the width ofthe lever 93 which they‘
support. ‘These'balls arev not movable and form
' a fulcrum for, one end of the lever 93. The latter
is of resilient material and is arranged within the
' chamber ‘F3 in normally substantial horizontal
position. ‘ A leaf spring 95 is ?xed at 96% to the
wall of the casing and extends longitudinally
above the lever 93, being spaced from the latter
throughout the greaterpart of its length,.and is
secured to the lever at the point 91. The lever
93'has an aperture'at 94; A block 99 is welded,
posed within a chamber II2 to which'access may
be had by means of a removable plug I I3.
The casing has a screw-threaded opening H4 Cr
in its bottom wall, and also has a screw-threaded
socket I I 5 leading from the chamber I99. A pipe
II‘I leads from the latter socket to a screw
threaded socket H8 in the lower, part 'I I9 of a
casing of an exhaust valve R (Figsrfi and 8). 10
This second exhaust or relay valve, or its equiva
lent, is provided for use with the valve device of'
Fig. 4, since it protects the temperature sensitive
elements of the latter from contact with ?uid at
15 brazed, or otherwise secured to the under side of
superheater temperature, and also permits the
lever 93 and supports a ball 99 disposed Within the 7 use of the inwardly opening valve I92 and avoid
opening 94 and held in proper position by a ver
ance of parts passing through ‘stuf?ng boxes or
equivalent friction producing elements.
tical portion of a leaf spring 95% secured to block
99. The lower end "of the screw 82 is normally
20
spaced slightly from~this ball. By turning the
screw 82 (by means of the socket-wrench device
86) the temperature at which the screw 92 will
begin to exert pressure on ball .99 and lever 93 may
‘ .
be predetermined.
Since the member 99 is but a
25 short distance from the fulcrum 92, any motion .
30
of the thermostatic device is multiplied in being
transmitted to the Valve, now to be described.
,At normal temperatures the lower end of screw
8.2 does not engage ball 99 and ‘the resilient lever
93 is'held‘ loosely vin contact with the balls I99‘
‘ and 92 by‘the leaf spring 95 whose function is
merely to keep the lever in proper operative posi
tion. Under normal conditions the balls I99 and
99 , are positioned by the spring elements. I I9 and
35 95a respectively so thatv the centers of the balls
are on the vertical axes of the parts‘ I96 and 82
respectively.
Whengthe 1 temperature rises and
screw 82 begins to press downwardly on the ball
99, thelever 93 is ?exed downwardly in an arc,
the. balls 92 forming a fixed fulcrum adjacent to
one end of the lever; ' If it were not for the balls
I99 and 99, interposed between the lever 93 and
1 the parts I I I ‘and 92,‘ respectively, and which re
_ duce the‘ friction between the engaging vparts to
a ,minimum, such ?exing of‘ the ‘lever (which
This exhaust valvevcasingv is furnished with a
chamber I29 at its upper part within which slides '
the cylindrical head portion, I2I of a relay or ex
haust valve feather I22 disposed within a cham
ber I2Ia near the central part‘ of. the casing.
This exhaust valve feather cooperates with an
' annular valve seat I23 de?ning‘ a ‘passage con
necting the chamber I2 Ia and a discharge passage‘
I24 in thelower part‘ of the casing. Within this
latter chamber slides a hollow cylindrical pis
ton member I26.v The interior of this piston, to
gether with the lower part of casing I I 9, forms a 80
chamber ' for pressure ?uid, and a restricted
Vbleeder'passage i526a leads through the piston,
which forms a‘_ movable upper wall of the cham
ber, into the discharge passage I24. The ‘passage
I24 is furnished with a lateral outlet I25 which
may be screw-threaded if desired for the recep
tion of an exhaust pipe, not shown, leading to any
suitable point. The casing is also furnished with
a screw-threaded socket I21 communicating with
chamber I29 and whichrreceives a pipe E28 lead;
ing to the opening H4 in the bottom of the cas
ing of valve K, or to any other convenient source
of saturated, ‘steam or vapor '(not superheated)
approximately at boiler pressure.
The exhaust
valve casing also has a threadedsocket I29'com 45
results in a‘slight: lateral shiftingof the contact municating
with the-chamber I2Ia, and from
points of the‘ balls) would result insubstantial,
.
this
socket
ajpi'pe
I39 leads to the socket 915*‘ of ‘
frictionhthereby' lessening the delicacy of opera-4
" a
tion. In particulanjsuch friction would tend, to, the main relief valve V.
' By employing the control valve'K in combina
develop side pressure of the member I96 against
its guides such as would prevent‘ valve I92 from , tion with the control valve Z. shown in Fig. l,
seating accurately,,with consequent leakage of - and in the combination illustrated in Fig. 8, it is
possible to cause they relief valve V to blow in
steam and rapid wear of the valve seat.
The upper part of the casing 68 is furnished
.with a chamber ‘I99 from which a passage, de
?ned by an'annular‘valve seat I9I, leads into
chamber ‘173. A controlor dischargevalve feather
‘I92 normally engages the seat I?la'nd is furn-.
response to excess temperature, either in the dis
charge pipe D from the superheater or in the
generator G itself. Assuming that the bimetallic
thermostat of the valve K has been’ designed to
respond to a predetermined abnormal tempera—
ture in the generator G, and assuming that all of
the other "valves are closed, it may be noted that
steam ‘from .the' generator normally ‘?lls the
by a light coiled spring I94 which may be ad
chamber ‘I3 and forces valve feather I92 against
' justably tensioned by means of a nut I95 engag
ing the upper end of the stem I93. This spring, its seat IN, and keeps all of the valve parts at a_
assisted by the ?uid pressure iii-chamber 13, nor- ' substantially uniform temperature and pressure,
during normal operation of the generator. How
65 mally‘holds the valve feather in contact with its
' ished'with astem I93 which projects up through
60 the top of the casing. This stem is surrounded
seat.
-
'
'
.
'
' The valve feather I2 is furnished with a cylin
drical head Ill?fwhich slides in a bore in a rib I91
on the wall of the casing. This head I06 is fur
nished with a vertically‘elongated slot I98 which
receives the free end 'of the lever 93. This free
end of therlever normally rests on a ball bearing
Hi9 which is conveniently retained in position by
a downturned end portion I I9 of the spring 95,
75 and which rests upon the upper end; of anad
_ ever, if the generator temperature rises abnor
mally, the thermostatic element ‘I5 expands and
pulls down-on rod "I6. This in turn draws the
yoke 80 downwardly and imposes tension on the
resilient lever 93.
This tension gradually in-v
creases, thus storing energy in the leverruntil
70
eventually the vforce exerted by the free end of‘
the lever 93. is su?icient to slightly overbalance
the steam pressure on valve I92 plus the pull of
spring I94. 'As soon as the valve is slightly off its 75
5
2,133,079)
seat pressure will build up in‘chamber I00, as the , enough to unseat the valve slightly. As soon as
pressure ?uid begins-to escape between the valve
steam can not escape rapidly throughthe re
stricted vent ,I26a of the relay or exhaust valve. and its .seat, the fluid. pressure'above the valve
Thereupon, the‘stored-up energy of resilient lever is reduced; and the stored-up energy of the spring
93 Fluid
will suddenly
at generator
snap valve‘
pressure
I02 wide
fromopen.
space 13 is
. will suddenly open the valve to its full extent
so as to‘ permit pressure ?uid from the chamber
now permitted to flow into chamber-I00 and 62 to exhaust through the pipe 45, thence through
through the pipe I I1 into the space below‘ thev ‘ the valve seat 41. and out through the passage‘
piston I26 of the exhaust'valve R. The space 13 49.’ This at'onceyenables the'iinbalanced' ?uid
and pipe I I‘! constituting parts of a conduit lead‘- _ pressure to open the main valve 60 so that pres 10
ing from the generator to the‘ exhaust valve de I sure ?uid is discharged very rapidly from the
vice R. This valve has previously been held‘to‘its ' superheater delivery pipe D, thus maintaining a
20
seat by fluid at substantially generator pressure in rapid flow of ?uid through the supei‘heater which
the chamber I20 delivered through the pipe I28. will reduce. the temperaturev in the superheater
and if the discharge capacity of the valve is
However, when the piston ‘I26 is exposed ‘to gen
erator pressure by the opening of valve? I02, ‘the selected properly in relation to the heating ca
valve I22 ‘is raised, it being noted that Vthe‘pisto'nv pacity of the superheater burner, the superheater
I26 is of greaterv diameter than the piston III‘. will be maintained at a safe temperature. When
Pressure ?uid is thus permitted to ?ow'from the the temperature has been lowered," the tube‘ 8
back pressure chamber 62' through the pipe I30 contracts, allowing the’ member I8'to riseand
into the chamber I2 Ia of the'exhaustivalve, thence
through the valve seat I23 and into the exhaust
passage I25. The main valve 60 is’ now unseated
by reason of the unbalanced pres'surebeneathjit,
and the valve opens wide to permit escape of
pressure fluid very rapidly from the generator.
thus permits'the spring .40 to restore the ex
haustvalve'35 to its seat; Pressure immediately
builds up in the chamber 62 and thus closes the
valve 60 so that further loss ‘of pressure ?uid is
prevented.
_
'
25
‘
vObviously, by choosing the members 8 and 9
of proper relative coe?lcients of expansion and
Obviously, from the construction described, the ,of
proper relative length, the exhaust valve 35,
relief valve V will blow whenever the tempera
and. hence the relief valve 60, may be made to
ture, either in the generator itself or in the super
heater delivery pipe D, exceeds a predetermined‘ open at substantially any desired temperature. 30
It will-.be noted that only the part 8 is exposed
temperature. The control valves herein described
are of highly sensitive character such that they ,
may readily be set to respond to a temperature
variation within a range of 25° F. and it will be
noted that whichever of the controlvalves'operé
ates ?rst, the relief valve V, in responding, will
draw steam from the superheater so that there is
no possibility that the latter will become‘ over
heated by failure of a proper ?ow of} ?uid there
40 through. 'By the use of the exhaust valve R in
association with control valve K; itis possible to
obtain greater 'sensitiveness ‘of operationat the
relatively'low temperatures‘to which the valve K
is-exposed," since‘the thermostatic device is only
required to open the delicately loaded valve‘ 'de
to the maximum pressure and temperature con
ditions within'thesuperheater, and. that by the
time the pressure ?uid has passed through the
chamber. 53 and through the chamber 62 and
thence to'the chamber 43 of the control valve,
its temperature will have dropped to such an ex
tent that injury to the parts of 1the control valve
byexcess temperature need not be feared.
By the useof the motion-transmitting mem 40
ber I8 all movable joints between. the thermally
responsive element and the leverl? are elimi
nated,‘so_ that there is no lost motion between
these parts, and thus the operation of the con
trolvalve is very accurate anddependable. Since, 45
as above noted, the parts of the control valve,
vice I02, whereupon'?uid at generator pressure . with the exception of the part 8, are not exposed
unbalances' the relay or exhaust'valve'and re
to the pressure ?uid at high temperature, they
leases the pressure in the back pressure chamber do ‘not- rapidly deteriorate and are capable of
of ‘the relief valve V. Since the temperature
range to which control valve Z is exposed is large,
the substantial ‘movement of the parts of the
thermostatic device may be depended on to pro
duce the desired movement of the valve device 36,
even though the latter be exposed to substantial
pressure.
.
‘
.
"
'
performing theirintended function over along 50
period of? time without repairs. . The proper
‘working of the lever arrangements'in both valve
designs-Fig.1 and Fig. ‘lv depends on proper di
mensioning of the resilient levers. A. numerical
example will indicatethe method by which suit 55
able dimensions 1 may be determined.
Suppose
Operation
valve 35v has an ‘effective seatingv area of .10
square. inch and is used-for 500’ lbs. per square
Assuming that the valve 60 is closed, and; that ' inch pressure and requires a 116 inch lift for op
thevalves 35, I02 and I22 are also closed, if the
erating valve 60. Further, spring 40 may exert
temperature of the pressure “?uid within the- . a. pressure of" 10 lbs. The ‘steam pressure on .10 60
superheater rises‘ above a'predetermined ‘point, square inch ls_50 lbs. making a total of 60 lbs.
the tube 8 expands, thus drawing the rod 9 down- 7
wardly ‘and pulling on the ?exible'element I8.
The pull on this element tends to tip the rocker
member 2| about‘ the fulcrum provided by the
roller 22, but such movement is opposed by the
action of the spring 40 andby the pressure ?uid
in chamber 43, which normally tend to hold the
valve 35 against its seat and with the member
70 34 engaging the member 33." However, after the
member 8 has'expanded in response to the at-,
Resilient‘lever/? ‘should then be designed so
that wither-load of 60 lbs. at point 33 it will
de?ect at least 11; inch.
‘ -i
v
,
65
"'It‘w'ill- benoted also, that ?guring‘ on 60 lbs.
at the outside end of the lever 25, anda lever
I ratio of v1':5-, the pull at I8 has tobe about 300
lbs. and the load on ball.22 is 360 lbs.v This will
, indicate-to anyone versed in the art thereason 70
for avoidingvplainor- pivot bearings and using
tainment :of ‘a predetermined temperature,‘ the rolling bearings throughout. . Knife-edge bear
rings, oi course, might be used, but the ball-roll
.resilient lev'er'26 'will have beenstressed there
by, and will havestored'up energy. ‘Eventually, er transmission as indicatedhas the advantage,
” the force exerted by the lever willbecome‘great
. of lower cost and less wear.‘v - »
-
'
75
6
2,133,073.
7 The valve device illustrated in Fig. 1 is pri-v -_ lower end
theinterior of the pressure ?uid
marily designed .for superheater protection-or container withwhich the device is associated,
other uses. where high accuracy is not'neces-V such bore I33: forming a chamber for the recep
sary. When 1 such; an arrangement as that. of
5 ~ Fig. l isiexposedjto substantial variations in tem
tion of pressure ?uid. 'The upper, end of this
bore is defined.‘ by a'?ange E34 integral with the
perature, for example‘, to :drafts of air, some member, I32 and within which is snugly ?tted a
errors in operation may’ result from unequal ex
long, depending tube I35 of a metalvlhich has
pansion or? contraction of the operating'parts, a<relatively high coe?icienti‘of expansion, for
and this error rgmay amount to as much as 10 example brass orsorne other alloy especially
10 to 15° F. in "the temperature at;which the valve designed to expand rapidly when subjected to 10
will open or‘ close. However; such relatively slight increase in temperature. This tube I35 is welded
errors are of little consequence whenjthe valve is or otherwise. permanently unitedso as to forrn a
used for superheater protection or in similar
places where a temperature variation of 10 to
15 15° is so smalla percentage of the total tem-v
Iperature.
e
i
r
v
;
While the device of Fig. l is useful; for the
purpose and under the ‘conditions above described
and may be preferable in such situations in view
20 of its'simpliclty, cheapness, and the ready ac
.cessibility of the operating parts, the valve de
gvice of Fig. 4 is more useful under other condi
tions (for exarnple where great accuracy in op
eratiori is required) and ifdesired may be sub
25 stituted for the device of Fig. l in such a, sys
tern vas that illustrated in Figs. 8 and 9. The
device of Fig. 4' is intended tu controi} pressure,
in response to the equivalent tiaporrtemperature
and is accurate to Within 2 or 31‘ F. It ‘thus may
30 be used, for example, tocontrol the blowing of a
boiler'working at 500'llbs. pressure and, with a
blovvdown of clnly 10 lbs. since ‘such a blowdown
corresponds to a change in vapor temperaturegof
only 27° F. In the arrangement shown in Figi'é
35
.
4;)
45
face of the ?ange I3I so as; to reach well into
the pressure ?uid'in’the container. Within the
lower end-of this tube there is arranged a cylin
der I31 of a material having a relatively low
coe?icient oi expansion as compared with the
tube I35, and this cylinder is preferably welded
or otherwise secured at I38 to the lower end of
the .tube so ‘as to close such lower end against
the entry of pressure ?uid. Preferably the cyl
inder I3‘I'terminates' at a point below the lower
surface of the ?ange member BI and secured
to its upper end is a cylinder or ‘tube I40 pref
erably of a metal'having a coef?cient of expan
sion similar: to that: of the tube I35. The parts
I40 and I4; may be united by a weld. I4I or -
in‘ any other suitable manner and the member
E46E projects upwardly beyond the upper end of‘
the tube i357 into a chamber formed by a casing
I 42 which is secured to the upperjpart of the
all of the operating parts are kept at substantially - member I32 by means of bolts I431’ or the like;
the same temperature by immersion in; saturated the. upper surface of the member I32 forming
vapor substantially ‘at a boiler pressure so that the ?oor of this chamber. I V
,
v
changes in outside temperature do not appre
The
upper
end
(it?
the
member
I
40
is
reduced
ciably aifect'the operation of the device. In‘this in diameter to provide’ a shoulder upon which
device the casing or housing 66 must be steam rests 'a yoke member I44 which is‘secured to
tight and heavy enough. to sustain the boiler the member I 40' by screwthreading the upper 40
pressure. If {the device ‘of. Fig. 4 is to be sub
end of the latter and applying thereto a’ clamping
stituted for that of Fig. 1 in the system shownirin nutwhich rests upon the upper-surface of the
FigsyB and 0, the passage," isiclosedr and the member
I44. The member I44 projects at op
pipe 45 is connected to the casing
H5, and posite sides of‘the member I40 and is provided
the opening ;at II4 would constitute the dis
near its opposite ends
upright posts I45
which carry'a bridge piece I46. This bridge
A preferred form of thermally responsive con
piece has a screw-threaded opening, at its center
trolling device, useful, in place of that illus
in axialalignment with the member I40 and
charge.
~
7
I
"
-
.
"
71
trated‘ in Fig. 1, and; a'daptedto' be used either
in combination with 'or in place of a controller
7 like that of Fig. 4,‘ in a system such as illustrated
in'Figs. 8 and 9, or which may be used alone
is shown in detailin Fig. 10. This control valve
_ device Q is especially’ designed to insure accu-'
' racy’ of operation" in: spite of the wide?uctua
tions of temperature to‘ which it is subjected,
to reduce friction betweenithe moving parts,
and to provide a controlvalve of wide ‘utility. '
‘60
leak=tight joint at the point I36 to’ the ?ange
I34 and extends downwardly to the chamber I33
and to a substantial distance below the lower sur
Referring. to’ the construction illustrated in
Fig. 10, the numeralgl3l designates the base
this screwethreaded opening receivesthe ad
justing screw I41.’ Thiss'crew has a cylindrical
head which, ?ts loosely within the; lower end of
a sleeve I48 to which it is pivotaily secured by
means of a loose rivet I43, the sleeve I48 being
free to rock slightly with reference to the’ screw.
Near its upper end the sleeve I48’ has a trans
verse pin I50 extending at right angles to the
rivetv I49% and which passes through a. trans
verse slot in the lower end of a rotary'member
I5I which turns in'a bearing opening in theéupper
wall of the casing I42. 'The member I5i pro
member oree‘attaching ?ange of the. improved 7 jects beyond the top wall' of 'theicasing and‘ is
controller device,‘ such ?ange preferably. being
a‘st'andard ?ange adapted to be'secured by bolts
:1 65 or the like to’ a'complemental ?ange on a ?tting
formingfpart of -a pressure; ?uid container, for,
example‘; the delivery pipe-;D (Fig. 8) leading
from a superheaterzsg However,_it is to beun
provided with a'klno'brl52 by means of which
it may be’ turned thereby? to turn the screw I47.
Preferably this knob I52‘: is'disposed Within a 65
housing cap I531 screw threaded or otherwise
attached to the ‘casing I42 and which may be
lockedtc prevent‘ surreptitious manipulation of
derstood that this: improved controller, device i the knob I52 by any suitable means, for ex
'70 may be attached to ?uid’ pressure containers of
other typesgforrexample, directly to a generator
ample the wire and seal I54._
1,3
.
The base member I 32 is provided with an over
70
sue-has the generatorG of Fig; 8. The‘base or V ‘ hanging portion I55 having a substantially hori
?angermember .iillvisr integral with an upright
' portion I32 having la substantially‘ cylindrical
vertical bore I33 adapted. to communicate at its
zontal vbore £56 which is; screw threaded’ atone
end‘ for .the reception of: an inlet pipe for pres
sure?uidvfThiéé pipe may, ior: example, corre 75
2,183,073
spond to the pipe 45 of Fig. 9 .or at ‘least a pipe
theiruppér ends cavities for the reception of
or conduit leading from a space normallycon
balls I82 which form the fulcrum for one end of
taining pressure ?uid and from which such pres- ‘ a ?exible resilient lever member I84. This lever
sure fluid is on occasion to be released' From is provided in itsupper surface with'an elongaté
V-shaped groove‘ I85 against the walls of which
the chamber I56 a vertical bore I51 leads up
wardly to the upper surface of the member I32, bears a ball I66~wwhich is held ‘within a cavity
such bore being enlarged near its upper end andv in the lower end of the. adjusting screw I41. A
?exible spring
member I81 is secured at one
‘ thin
_
_
the lowerend of a valve seatIme'mber I58 'hav-‘ I end at the point I88 to the lever I84 and its op
10 ing. a conical valve seat I59 de?ning a‘passag'e > posite end is'bent upwardly and ‘forked and has 16
leading from the bore I‘51 to ya chamber I60 its forkedendmesting upon the member I46 on
within the valve seat member. From this cham the opposite-sides of the. adjusting screw I41;v
internally screw threaded for the receptioncf
ber‘ I60 one or more openings I6I lead to a cham- ’
This spring ‘forms a resilient support for the
ber I62 within a casing I63 secured by bolts
long arm I90 of the lever.
~
.
~
The voppositefend I90“ of the lever rests upon 15
163% to the upper surface of the member I32; ~
The upper portion of the seat memberrl58' , the ball I 8| and the latter is preferably limited
?ts snugly within'an opening in the upper wall infits movements by a spring member 'I9I se
of the casing member I63 and is provided‘with ‘cured to‘the under side of the lever. Prefer
a vertical bore in axial alignment with the seat: ably the surface of the lever which engages the
opening I59. This bore receives the sliding ball vIIH andthesurface which rests upon the
stem member I65 of a conical valvelrfeather . ball I83 are in substantially. the same plane 'asthe
I155a which cooperates with‘the seat I59 so as points of contact of the ball _ I86swith the side
normally {tov prevent the v?ow of pressure ?uid ' walls of the 'v_-lgr.oove I85.
The overhanging'portion I55 of the member
from the chamber I51 to the chamber I60.
Preferably this stem I65 is provided with circum
ferential grooves to provide a ?uid'seal, and at
its upper end is reduced in'diameter to provide
I32 is provided with a vertical‘ bore I92 leading 25
down from-the chamber I62 and intora hori
zontal bore I96-which, if desired, may be screw
threaded for they reception of an exhaust ‘pipe
the top surface of the casing member ‘I63 and leading to :any desired point. However. this
which‘ has a head or enlargement I61 'atiits _ pipe may- be dispensed with if preferred, the pres 30
the neck portion I66 which projects up above
upper
end.
'
'
‘
"The inner casing member I63 is provided with
" an upwardly extending
portion providing a‘
sure ?uid'being allowedto exhaust directly from
the end-10f theibore I93 into the atmosphere.
Preferably, in order-toremove any condensate
which might?'collect in the interior of- the cas-.
35 of the stem member I65, such chamber being . ing I42, there is provided a drain opening I94 35
open at one side as indicated at I69. Above the leading to ai'socketin which may be screwed a
chamber I‘Bilimmediately above the upper end
chamber I68‘the casing member I63 is con
tinued as a substantially cylindrical'guidemem
ber I16 having acylindricaI borein axial ‘align
40 ment'with thevalve seat ‘I69 and-within which .
drain pipe ~I95.1eading' tofany, desired point of
discharge. Preferably» astop screw I96 is screwed
into a threaded‘ opening in the upper part of‘ the
casing ‘I63,»with‘its'head immediately beneath’
bore slides an actuator member I1I preferably the long arm'I 90» of. the lever II84 so as to limit.
.
having cylindrical enlargements near its upper ‘ downward movement, ofsaidiarm. ' .
' The "screw' I15 is ‘adjusted by ‘the maker to pro- .
and lower ends which have sliding engagement
with the walls of this bore. Near its upper- end‘ videa'clearanoe, preferably of the order of 0.002
inch between the under surfacev of block 7 I19
45 the member I1I is provided with a transverse
pin IE2 which‘ projects out at opposite sides" and the‘ upper surface of the head I61 of'the
through a slot in the upper end of the member ‘valve stem'when the valve feather I658. is seated
I16, the opposite ends of the pin‘ I12 resting and thetop'of the actuator guide I1I is in con
upon a collar I13.which in turn bears, against tact'with'thescrew‘I15. There-is also a clear
the'upper end of a coiled spring I14 encircling ance of the order of 0.002 inch betweenthe
the upper part of the-member I10 and resting .under surface of: the head I61 and the top sur
upon a shoulder of the latter. 1A stop ‘screw I15 face‘f'of the slotted member I18 when the valve
is screwed into the threaded upper end portion
is
seated.
_.
,
6
~
-
of the'member I10 and normally bears ‘against , ' ‘In the operation of this device, and assuming
55 the upper end of the member I1.I. thereby’to
limit the upward movement of the latter in re
~
spouse to the spring
I14.
‘
.
1
that it is so arranged as to take the place of the 55
controller ldevice Z of Figs. 8 and 9,.and assuming
that th'e'pipe v45 of Fig. 9leads to the bore I56
Atits lower end the member I1I is provided ‘ of the controller Q, and assuming that the valve
with. an enlarged headportion I16. having an I65a is closed against its seat I59, the parts will
upper member I11 disposed vertically above the remain in ‘this position until the temperature in 60
valve stem member I65. . The head I16 is also the pressure ?uid container reaches the point. at
provided with a lower member I18 which is slotted which ‘the relief ‘valve V is designed to blow.
to receive the-neck portion I66 of the valve stem When .the'temperature substantially reaches this
I65: Immediatelyabovethe head I61 of the point the tube I35 will have so elongated as to
valve stem there is arranged a block I19 secured ’ .
cause'the part ‘I46, together with the adjusting
screw 141,, toyfmove downwardly thereby press;
to ‘the head I16 but with a slight clearance be
tween the under surface of the block and the ing the ball I 86 against the lever I84, causing
head I61 when the parts are in normal .posie 9 the" latter to ‘flex and thus store ‘up energy.
tion, that is to say, when the valve is closed. The When ithelever has been bent to‘ a certain degree '
block‘ I19 is provided on its upper facewith a‘ in ‘response to the‘ continued elongation of the
horizontally elongate V-shaped- groove I80 which tube 135,‘; the end I90a of the lever will press so
‘ forciblyagainst the ball I8I as to move the lat
receives a motion-transmitting .ball I8 I .
. At the opposite side of the casing I42 there are ter downin opposition. to the spring I14, closing
provided two ?xed post's I82 secured'in any de-v
sired ‘manner to the member I32 and having at ~
theigap between the lower surface of the block
I19iand thelhead I61 of the valve stem and 75
8
2,133,073
: eventually unseating‘ the" valve I'65-very's1ightly
from the seat I59, the back pressure inthe' space
I51 being the sole leading means that normally
keeps the feather tight against its seat‘. As soon
,as the 'valve..l65a leaves its seat, the pressure
I ?uid in the back pressure chamber 62 of the re
lief valve V escapes through the valve seat I59
to such an extent that the pressure beneath. valve
those skilled in the art, but we contemplate that
all such arrangements as fall within the scope of
the appended claims are to be regarded as form
ing-apart of this invention. .
We
claim:
'
.
.
.
'
l; Inja valve apparatus of the kind whichcom
prises a casing having therein "a valve seat de?n
ing the outlet to a space in which ?uid pressure
is normallylmaintained, and a valve feather co
.feather I65a~is very substantially lowered; the
chamber I62and communicating passages being 7 operating with the seat and normally closing said
of limited capacity. Immediately, upon such outlet, one side of the valve feather being exposed
substantial lowering of the back pressure‘. against
the under surface .ofthe valve feather ll65a, the
‘stored-up energy of theresilient lever I64 snaps
the valve open to its fullest extent, whereupon
the pressure in the‘ chamber I62 drops suddenly
to just below the amount required to permit the
main valve feather 60~to open.
to the'fluid pressure in said space and its ‘oppo
site side beingvexposed to a lesser pressure, said
valve feather ,being arranged to open against the
fluid pressure in said space‘, in combination, valve . :
actuating means comprising 'a movable part op
erative to unseat the valve feather, a resilient
This condition is ' lever for moving said part, a‘ rolling element in
obtained by the; proper relative dimensioning-of
the steam passages in the main andpilot valve
and the elasticity of theflexible member I84.
'In .this modi?ed construction of. Fig. 10, the
terposed between said part and the lever, said
rolling element being movable longitudinally of
20
the lever, a fulcrum for the lever, and a motor
device for swinging the lever about its fulcrum,
stem I65 of the valve feather I65a is guided ac
the parts being so designed and arranged that the
curately in a rectilinear path so that'the valve ' lever ?rst ?exes before fully unseating the valve
feather always seats squarely and ?rmly, and
since‘ the ball IBI is'free to roll in the V-groove
I80, the stem I65 is not subjected to any side
thrust by reason of the arcuate movement of the
end, 5 96a of lever I84, thus avoiding any tendency
‘ i to cause the stem to bind-in its guideway.
By ar
ranging the‘ contact. ball I86 at the lower end of
the screw I41 with provision for-turning the
screw from a point outside of the casing, it is
possible readily and quickly towcalibrate the con- .
trolling‘ device so as to operate accurately at the
desired temperature, while :the use‘of balls as
the contact elements between the lever‘ and the
other parts assures .a substantially frictionless
transmission of the considerable forces involved.
40 , The bore vI33provides a jacket forlthe upper
part of the tube I35 so that a substantial length
‘of the latter is always subjected to the pressure
?uid. Preferably, "all of the active structure
within thebase and the casing I42, for example,
45 the parts I40, I44, I45, I46, etc., are made of the
same material or of one having the same coef?
,cient of expansion as the tube ‘I35, so that as the
temperature of the base I32 suddenly rises when
the valve I65a opens andrhigh temperature pres
sure ?uid enters thespaces I56, I62 and M3, the
operative parts'all expand at substantially. the
same rate, thus avoiding inaccuracies due to
'
differential expansion.
After the valve has opened and the tempera-v
55 ture of the pressure fluid in the ‘container has
dropped, the endISi) of lever I84 rises and spring
H4 gradually ‘moves the valve feather I65“ to
ward its seat. When the valve feather is still
0.002 inch from its seat, the actuator part I18 is
60 stopped by the "screw I15 and thereafter, increas
ing fluid pressure beneath the valve feather I65a
seats the latter without opposition from the .actue
ator parts. The stop screw-I96 is so adjusted by
the maker that when lever‘ I84 has beenn?lexed to
6.5. a maximum extent and contacts with the stop
feather thereby to store up energy for suddenly
opening the valve to full capacity immediately,
after it begins to leave its seat.‘
2,; In a relief valve apparatus of the kind which
includes a housing havingtherein a valveseat,
a main valve feather constituting a movable wall .50
for a fluid chamber otherwise closed except for
a restricted ?uidpassage and ‘a duct of relatively
greater capacity, and a control device including a
control valve feather normally closing said duct,
and means guiding said feather to move in a 35
substantially rectilinear path, in combination,
valve actuating means comprising‘ amotor de
vice including a movable part; a lever having a
short arm and a relatively long arm, means for
transmitting movement from, said movable part
to the’ short arm of the lever, and substantially
unyielding motion transmitting means interposed
between the free, end vof the long arm of the lever
and the control valve feather, said motion transe
mitting means including a} freely rolling ball mov
able longitudinally of the lever thereby to avoid
cramping of the Valve feather by reason of. the
arcuate movement of the end of the lever.
B. In a relief valve apparatus of the kind which
includes a housing having therein a main valve ,
seat, a main valve feather, and a back pressure
chamber having a restricted entrance for pres
sure fluid and in which sufficient pressure is nor
mally maintained to hold the main valve feather
to its seat, and a control device including a rec
tilinearly reciprocable control valve feather nor
mally closing an exhaust'passage leading from
s'ai'cl'back pressure chamber, in combination, valve
actuating means comprising a motor device in
cluding a reciprocable part, a lever varranged to
a bearing ball operative to transmit motion from
the lever to the ‘control valve feather, said ball
movable lengthwise of the lever.
screw,>the valve feather 1155?‘ is spaced from its, beingfreely
4. In a control valve apparatus of the kind in—
seat by a distance ofithe order of a“; of ' an inch.
»While we have. illustrated desirable‘ embodi-. cluding a casingihaving therein a space for pres:
.ments of theinvention by way of example, we -~ sure ?uid, av valve feather normally closing a
duct of substantial capacity connecting said space
/ wish itto be understood that various changes in
size,‘ proportion and arrangement of parts, ‘as well with a ‘chamber otherwise closed except for a
‘ asthe substitution of other materials than those
speci?cally mentioned, may bemadewithout de
parting'from the spirit'ofthe invention“ _ Other
; useful. arrangements mayisuggest themselves. to
60
be swung about'a fulcrum point bymovement of
said reciprocable motor partin one direction, and
relatively, restricted passageway for '?uid, and
guide means constraining the valve feather. to
move Jaxially 'in' a rectilinear path, said valve
feather. being arranged to open against the pres
suregin said: duct, in combination, valve actuat
65
9
2,133,073
ing means within the casing comprising a re
silient valve opening lever, a motor device, means‘
actuable by said motor to move the lever thereby
to unseat the valve feather to open said duct, said
means including a bearing ball freely movable
longitudinally of the lever.
.
9. Actuating means for unseating a normally
closed valve feather of the kind having a guide
stem which slides axially in a rigid bearing and
which has ahead at its end, said actuating
means having parts disposed above and below
said head, stop means operativenormally to po
5. Valve actuating means operative to unseat 7 sition said parts so that they are spaced slightly
a normally closed valve feather from its seat, from the head, the part above the head having a
ball support, a ball, resting on said support, a
' said actuating means comprising a part provided
lever having one end resting on the ball, a ful 10
with a slot, a resilient lever, ?xed fulcrum means
for the lever, one end of the lever being disposed crum for-the lever, and motor means for swing
within the slot in said part, an anti-friction ball ing the lever about its fulcrum thereby to unseat
disposed between the lever and'an adjacent wall the valve.
10. Actuating means for unseating a normally I
of the slot in said part, the ball being movable
15 along said wall, longitudinally of the lever, and , ‘closed valve feather of the kind'having a stem
motor means operative to ?ex the lever thereby . which slides axially in a rigid bearing having
'a rectilinear slideway for the stem, said actuating
to unseat the valve feather.
6. Valve actuating means operative to unseat a means, comprising a movable part having a ball
normally
closed rectilinearly movable, valve
feather from its seat, said actuating means ,com
prising a motor device including a movable part,
a pressure applying ball associated with said part,
a lever having a cavity in which the ball rests,
a fulcrum for one end of the lever, and sub
25 stantially unyielding motion-transmitting means
interposed between the other end of the lever
and the valve feather, said motion-transmitting
means comprising a rigid ball arranged for free
movement longitudinally of the lever thereby to
30 avoid cramping of the feather by reason of the
arcuate movement of the end of the lever. '
7.,Valve actuating means operative to unseat
a normally closed valve feather from its seat, said
actuating means comprising a resilient lever, a
35 fulcrum for said lever, one end of the lever being
arranged to actuate the valve feather, a spring
supported at one end and having its other end
bearing upon the lever at a point remote from the
fulcrum of the latter, motor means comprising
a movable part, and adjustable means actuable'
by said movable part and adapted‘ to bear upon
the lever at a point intermediate the ends of the
latter whereby operation of the motor, means is '
effective to unseat thevalve feather.
45
support disposed above the end of the stem, said
ball support having a V-groove extending sub- 7
stantially perpendicular to the axis of the stem,
a ball in said groove, a lever having one end
resting on the ball, a second ball constituting a
fulcrum for the lever, and lever actuating mo
tor means comprising a moving part, and a third
ball interposed between said latter part and the
lever, the points of contact of the several balls
with the lever being substantially in the same
plane.
'
11. Valve actuating means operative to unseat 30
a normally closed rectilinearly movable valve
feather from its seat, said actuating means com
prising a resilient valve opening lever, a pair of
spaced balls constituting a two-point fulcrum for
said lever adjacent to one end thereof, the other 35
end portion of the lever being arranged to actu
ate the valve feather, and substantially unyield
ing motion-transmitting means interposed be
tween the other end of the lever and the valve
feather, said motion~transmitting means com 40
prising a rigid ball arranged for free movement
longitudinally of the lever thereby to avoid
cramping of the valve feather by reason of the
arcuate movement of the end of the lever, motor
8. Actuating means for unseating a normally
closed valve feather of the kind having a guiding
means comprising a movable part, and an anti
stem which slides axially in a rigid bearing, said
part and the lever and bearing upon a part of ,
the lever at a point intermediate the ends of the
latter whereby operation of the motor means is
perpendicular to the axis of the stem, a ball free '_ effective to unseat the valve feather and there
to roll along‘ said guideway, a lever having one by open said duct.
JAMES BRISCOE.
end resting on said ball, a'fulcrum for the lever,
RUDOIF BECK.
and motor means for swinging the lever about its
actuating means comprising a movable part pro- '
vided with an elongate guideway substantially
fulcrum.
,
,
45
friction ball interposed between said movable
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