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Патент USA US2412218

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Deb. 1.0, 1946.’
' -
Filed Aug. 31, 1944
> 4 Sheets-Sheet 2
Mina/v l‘l/LMER
6:0/POEJ \f/bmkow'rz
THaMAs/YAH'ER 190mm
?r {M PW"
Dec. 10, 1946.
Filed Aug. 51, 1944
4 Sheets-Sheet 4
Patented Dec. 10, 1946
CONTROL nsvros
Milton Hilmer, Center Valley, and George J. Sig
narovitz, Allentown, Pa., and Thomas Napier
Adlam, West Orange, N. 3., assignors to Sarco
Company, Inc., New York, N. Y., a corporation
of New York
Application August 31, 1944, Serial No. 552,190’ " v
8 Claims.
(Cl. 236-474)
by the pressure of the velocity head of the me
This invention is for a control device for auto
matically regulating the flow of a fluid to a re
dium in the system.
Fig. 6 is a similar view of the pressure control
when the systemv is under negative pressure.
ceiver in accordance with the pressure of the ?uid
therein and the temperature exteriorly thereof.
The invention primarily comprehends a control
device for automatically regulating the flow of a
Fig. 7 is a diagrammatic view illustrating the
control device installed‘in a system.
. ,
V . Referring to the drawings by charactersof ref
?uid such as a medium for a heating or a cooling
_ system which is admitted into the system through
erence, the control device includes a control valve
A for automatically admitting therethrough fluid
a valve adapted to be regulated by reciprocating .
mediums to heating or cooling systems, one such
.means movable between limits to varythe size 10 system being indicated generallyv by the reference
of the opening of the port thereof and which re
character B. The control valve A is actuated by
ciprocating means is moved in response to pre
an hydraulic piston l0 under pressure delivered
determined pressure requirements of the ?uid
by a motor driven pump C which is placed in or
in the system and the temperature of the atmos
out of operation in accordance with predeter
phere outside of the enclosure. containing the
mined pressure requirements in the system and
the atmospheric temperature outside of the en
The invention further embodies a control de
closure containing the system which functions
vice of the indicated character in which the re
through a lever system D to actuate an electric
ciprocating meansfor regulating the size of the 20 switch E in circuit with the motor ll of the
port opening is actuated by motor driven hydrau
' motor driven pump C.
lic pressure creating means, the motor of which
The rotor of the pump C is coupled to the ro
is in circuit with an electric switch for rendering
tating shaft of the electric motor vll andv the
the same active and inactive and wherein the
pump and motor are supported by an angle
switch is actuated by a lever movable in response 25 bracket l2 secured to anddepending fromthe
to predetermined pressure requirements in the
system and the atmospheric temperature outside
underside of the lower head I3 of a cylinder it
in which the piston I0 is mounted. The pump
and motor together with‘the cylinder [4 are con
of the enclosure containing the system.
More particularly, the invention contemplates
a control device for regulating the flow of a medi
um to a system in which said medium may be
tained within a casing I5 which also forms an
oil reservoir in which the pump and, motor are
immersed and from which the oilis ‘taken in
under positive or negative pressure and the posi
tive pressure in the system may be the actual
pressure or the pressure due to the velocity head
and forced by the pump through the discharge
” conduit l6 into the cylinder, “to create-them]
of the medium therein.
' draulic pressure therein below the piston Ill. The
= casing I5 is provided with a
reference is now made to the'following speci?
cation and the accompanying drawings in which
there is disclosed the preferred embodiments of
the invention.
In the drawings:
cover is formed with a depending annular ?ange
, l9 snugly ?tted within the upper end of the cyl
inder M to which the cylinder is secured by bolts
close the underlying structure.
Fig. 2 is a sectional view taken approximately
on the line 2—2 of Figure 1.
A discharge pipe 2| leads from the cylinder’ M
to a solenoid valve 22 located‘in the casing l5
and through which valve the oil in the cylinder
is returned to the casing to thereby relieve'the
Fig. 1 is a side viewof a control device con
structed in accordance with the invention, with
parts broken away and shown in section to dis
cover 11 secured in
sealingrelation thereon by‘bolts I 8 and which
With the foregoing and other objects in View,
hydraulic pressure below the piston IE1. The
casing I5 is provided with an oil admission open
ing in the cover I‘! and a drain opening in the
bottom wall thereof which are respectively closed
Fig. 3 is an enlarged fragmentary sectional view
by screw plugs 23 and 24.
taken approximately on the line 3-—-3 of Figure 2.
The piston I0 is af?xed to the lower end of ‘a
Fig. 4 is a fragmentary diagrammatic view il 50
lustrating the leverage action for effecting actu
ation of the electric switch.
Fig. 5 is a fragmentary side view with parts
shown in section of the pressure control and
connection with the system when the control is'
piston rod 25 which extends upwardly through
a guide opening 25v in the upper end wall of an
inverted cup-shaped member 21 mounted upon
the cover I‘! and threadedly secured in the central
' ‘opening 28 thereof.'
A coiled expansion spring
29 surrounds the piston rod 25 and is inter
posed between the piston l8 and the end wall of
the inverted cup-shaped member 21 so as to ten
otally attached by a fulcrum pintle 6| to a
bracket 62 carried by the housing 48. The yoke is
provided with spaced parallel legs 63 and 64
having aligned apertures 65 and 65 through which
sion the piston against the hydraulic pressure
produced in the cylinder M. The piston rod 25 5 a thrust rod 81 is freely slidable. The thrust
also protrudes through an opening 38 in the
rod is threaded as at 68 and threadedly engages
upper end wall¢of an inverted cup-shapedmem
ber 3| which’is ‘secured to the piston ‘rod by a
set screw 32 so as to move with said rod and to
nut 169 between which and the leg
“64 a coiled expansion ‘spring '78 is interposed in
I surrounding relation to the thrust rod for nor
mount the same for telescopic sliding engagement lO ‘mally urging the nut 69 into engagement with
with the-cup-shaped member 21.
‘the leg 63 of the yoke. The opposite end of the
The control valve A is of anydesired type and
thrust rod-is formed with a keried head 1| by
v as illustrated the same‘ is pprovidedwith inlet
.means ‘of which ‘the thrust rod is rotated to
and outlet openings 33 and 34 and .w'ithaligned
>~adjustthesame“axially. The thrust rod adja
ports 35 through which the :?ow‘of the medium 11'5 wcentthe ker?edhead has secured thereto a disk
is controlled by valve disks 36 carried by a valve
‘i2 having a :knurled periphery with which a
stem 31. The valve is of the normally closed
detent spring .73 engages to retain the thrust
type having a coiled expansion spring :38 ‘engag
vrod ‘in "axially ‘adjusted position.
ing the upper end of the valve stem 3.‘! .so ‘as
,The‘leg 63 of the yoke 60 is also provided with
to normally maintain the disks 36 in contact with 20 a stud 14 which is disposed below and in paral
the valve seats 35. The valve is secured in an
lel spacedrelation to thethrust rod 6.‘! and ‘said
opening ‘in‘the upper end of ayoke ‘39 mounted
stud adjacentlits 'free terminal is provided ‘with
uponahousing 40 which .is cast integrally vwith
a ‘laterally projecting pin T5 to which .is ;‘at
‘the cover T1 to {dispose thehousing in upstand
tached ‘a coiled ,con'tractile spring .115, the oppo
.ing .rela'tionrthereon and by whicharrangement .25 "sitelend of‘ which is anchored seat 71 .to the
the ‘valve stem ‘is positioned jinlaxial alignment
housing 59min an-elevatedvposition so that the
with. and .is adapted to be engaged by the piston
spring '75 normally exerts .a’tension to swing
rbizli?ior‘moVemé‘nt ‘therewith‘to open the valve
‘the ‘yoke upwardly while .tensioning the same
ports ‘35 ‘by the hydraulic pressure established
underitheipiston Hi.
{The electrical switch’E consists of an insulated
housing having ‘therein {?xed contact elements
‘4'2lfandT4‘3 .andapivotedicontact element 44 'ful
.c'rume'd as at “4'5Ifor movement into engagement
against downward movement. A.lclepending.abut- '
:30 jmen'tl?nger 18 having its free lower end in en
gagement with the rock lever‘SS 'is;mountedfor
sliding movement :on the stud "l4 andisadapted
[to be retained ‘in adjusted ‘position thereon by
a ‘set "screw' 19.
withfthe'?xed contact elements 42 and “respec 35' 'Thelever system ‘D is‘interposed between the
tivély and normally urged by a spring "48 into
'thrust'rod 6'! of the 'yoke 60 and a pair‘o'f plunge
' contact with-the ?xed contact element ‘42. "The
1 switch .E is arrangedfin a circuit which includes
a‘ source of current supply “having a conductor
ers 88 and 8| respectively responsive to the ;pre
determined pressure requirements in ‘ ‘the system
“B and the atmospheric 'temperature‘outside ‘the
18 ‘leading 'from one pole thereof and connected 40 ~ enclosure containing the system. 'Theplunger-W
with one side of the motor Ill and having inter
posed thereina starting switch £43. A conductor
50 leads from the other polethereo-f and .is con
.nected with themovable contact element '44 of
protrudes through the-apertured‘headof a cas
ing ‘83' with the protruding end thereof ‘pivotally
vconnectedto the upper'en'd of a ‘lever 84 of the
_ ‘lever system ‘B and with the outer end vof ‘the
theswitch SE, while-a conductor 5| leads .from 4*"p11in'ger ‘ai‘?xed to {the head 585 of an vexpansible
theifixed contact element '42 thereof to the other
"and contractible sealing "tube ‘88 located ‘in the
side 01’ the motor, thus completing one of the
casing ‘83 'in spaced-relation'fto the end and-pe
v[circuits with theswitch. The-switch is .also in
circuit with the winding of the solenoid valve
ripheral wall ‘thereof. ‘The sealing tube I86 has
its inner ‘end secured to the ‘aperture'd head of ,
Q12 “by aconduc'tor'52 which 'leads vfrom one side 50 the casing 183 tOFthere'byse'a'I o'if‘the plunger 80
omen Winding to the fixed contact element 43
from "th‘e'cas‘ing ‘83. "The casing '83 ‘is in com
--of thesw'itch and .a conductor 53 which leads
inunication with the system ‘B "by ‘means of “the
_-irom ithe iotherisideof .isaid winding andis con
piping vf8"! 'through ‘which ‘the ‘pressure 1‘of ‘the ‘
nected to the conductor .48 ‘leading to the cur
:medium 'in the system‘tis "transmittedto : ie lhead
rent supply 411,,- thus completing the'ci-rcuit
throughthe movable contactielement 44.
The switch Eisprovided with van actuator pin
7 FLIIJwhichengagesWith thepivotal contactelement
44 ‘and is adapted upon inwardmovement thereof
to separate said pivotal contact element {from
the :?xed contact element 42 to thus break the
circuit’ with the ‘motor 4H and upon ‘further
. movement of said pin to .force said pivotal con
85 to move the plunger atian'dithe'upperrendrof
the lever r84 ‘against the tension "of 1a coiled ex
pansion , spring ‘388 disposediin surrounding :r'e'la
:ti'ontto {the ‘plunger 80 *b etween~~the enlarged head
thereof "and the z'apertured ‘head “of i the casing 83.
The lever system D is located in ran auxiliary
housing 89 to which the casing r8'3IiS secured by
vbolts ‘r911
the ;plunger 5B0 projecting 'into the
ihousing-zthroughfan opening ‘9A .imthe sidewall
tact-element into contact with the‘ ?xed contact
v92¢thereo'fand with the inner end of the ‘plunger
element 43 tothereby close the circuit with they <35 pivotally engaging the :llpper-wend :of :the lever =‘84
winding of the solenoid valve to thereby open
assdescribed. VII-‘he- auxiliary :housing 89 is ~se
the ‘valve. ‘The switchliiis rigidly attached .to
cured by bolts 93 to 1a side _wall .of the housing
andsupportedby avpairlof arms 55 and56 which
40 and which housings have registering open
‘are pivoted by a fulcrum =pintle .51 to .abracket
ings $4 and ,‘95 disposed in {alignment with 'the
“58 ‘carried by the housing 48. A .rock lever 58 70': axisof the-thrustrod 6.1. i.
is also pivotally carried by, the ‘fulcrum pintle
The .plungern?l also . projects into the auxiliary
‘~51..forswinging-movement with theswitch .and
housing 89 through an ‘opening A55 ,in ‘the ‘side
-relati-ve thereto :for shifting .theactuator pin .54;
. wall 92 thereof so .as?to ‘(21151305617118 plunger 8|
"inwardly as described.
;.parallel.to_and inlthe same 'verticalplane withlthe
Disposed above the switchllE .is a yoke '68 piv-, if?fplungerjll. The .,plunger .8] ihasits inner end
movement of the‘ annulus longitudinally of; the
»-lever by turning :of the screw H0. ‘The abut
"tion 91 to the offset lower end of the lever 84,
ment element>I09 is a?ixed to said annulusfor
the outer end of the plunger being a?ixed to
‘movement therewith by studs I I2 which are slid
'the head 98 of an expansible ‘and contractible
able in oppositely disposed longitudinally extend
sealing tube 99 located in a casing I00 in spaced
ing guide slots I I3 in the lever I04 and have their
relation to the end and peripheral wall thereof.
outer ends extending through openings in oppo
The sealing tube 99 and the casing I00 are se
site side portions of the abutment element with
cured at their inner ends to the side wall 92 of
their inner ends anchored in threaded openings
the auxiliary housing 89 to seal the tube 99 with
in the casing I00 andto seal off the plunger 8| 10 in said annulus. The manipulating screw IIO
projects through a slot I I4 in the auxiliaryhous
from the casing. The said casing is in com
swingably connected by a pin and slot connec
ing 89 and is provided with a head “5 for man
munication with a bulb IN by means of flexi
ble tubing I02 which bulb and tubing and the
‘ space within the casing surrounding the sealing
‘ tube 99 contain a thermal liquid which acts upon 15
the head of the sealing tube to move the plunger
-_BI and the lower end of the lever 84 in accord—_ »
'ance with the pressure set up in the thermal
ually turning the same.
A switch actuating leg I I6 is a?lxed to the
inverted cup-shaped member 3I which is'carried
by the piston rod '25 and the electric switch E is
' provided with ‘a projection II1 which is disposed
above the ‘free end of the leg I I6 so that when the
piston rod is moved upwardly by‘the hydraulic
liquid by the expansion thereof due to any in
crease in temperature of ‘the atmosphere at the 20 pressure created by the pump C the leg H6 en
gages the projection H1. and swings the switch
location of the bulb. The pressure upon the head
E and the rock lever 59 upwardly which lever
of the sealing tube 99 is normally opposed by the
upon impingement against a stop ?nger I'I8 de
tension of a coiled expansion spring I03 sur
presses the actuator pin 54 to break the circuit
rounding the plunger 8I between the enlarged
head thereof and the side wall 92 of the auxiliary 25 with the motor II and thereby discontinue the
operation of the pump C. When the operation
housing 89. The spring I03 thus functions to
of the motor and pump is thus discontinued, the
move the plunger 8| and the lower end of the
upward opening movement of the valve stem’ 31
lever outwardly upon any contraction of the ther
ceases and the valve disks 36 are maintained in .
mal liquid due to a decrease in temperature of
30 open relation which is the maximum‘ opened‘po
the atmosphere at the location of the bulb.
sition of the said disks. If, however, ‘a su?lcient
The lever system D also includes a lever I04
which is swingably mounted on pivot pins I05
engaging through bearing openings in the bifur
quantity of the medium has passed through the
valve to maintain the predetermined pressure'in
the system B before the valve disks 36 have been
cated lower end I06 thereof and through a brack
et I01 secured to the inner face of the auxiliary 35 moved 'to their maximum opened position, the
pressure in the system B will be exerted against
' housing 89 for movement of said lever in a plane
the head 85 to force the same together with the
extending longitudinally through the lever 84.
plunger 80 inwardly. The inward movement oi‘
A thrust arm I08 is pivoted to the upper end of
the plunger 80 functions to rock the levers 84
the lever I94 and is slidably guided adjacent its
inner end in the aligned openings 94 and 95 of 40 and I04 to thereby move the lever arm I08 in
wardly against the thrust rod. 61 of the yoke 60
the housing 40 and auxiliary housing 89 to there
which swings downwardly and rocks the rock le
by dispose the same in axial alignment with the
ver 59 so as to depress the actuator pin 54 and
thrust rod 61 and with the free end of said thrust
thereby move the movable contact element 44 to
arm I08 normally arranged in abutting engage
45 break the circuit with the motor II. This dis
ment with the free end of the thrust rod 67.
continues the operation of the pump and the up
The lever I04 is of tubular construction and
ward movement of the valve stem 31 so that the
‘the same is provided with an abutment element
valve disks 36 are maintained in open suspended
I09 disposed in engagement with the lever 84 on
relation which permits the flow of the medium
which it rocks as a fulcrum when the opposite
ends of lever 84 have relative movement due to 50 into the system B.
unequal movement of the plungers 80 and BI
or when the plungers move in opposite directions.
In the event that the pressure in the system‘ B
continues to rise, the plunger 80 will be moved
farther inwardly which will effect a farther in
ward movement of the lever arm I08 was to
84 moves inwardly and outwardly a distance equal
to the sum total of the movements of the plung 55 swing the yoke 60 and the rock lever 59 down
wardly to depress the actuator pin 54 farther to
ers 80 and 8! to thereby swing the lever I04 in
thereby move the movable contact element 44
wardly when the sum total of the movements of
In} addition to said rocking movement, the lever
into engagement with the ?xed contact element
the plungers effects inward movement of the
43 and close the circuit with the solenoid valve
lever 84, the spring ‘I6 of the yoke 60 function
ing to swing the lever I04 outwardly when the 60 which is then opened to permit of the discharge
sum total of the movements of the plungers ef
fects outward movement of the lever 84. The
aforesaid movement of the lever I94 effects rock
_'ing movement of the yoke 60 through the thrust
rod‘ 67 and thrust arm I08 to thereby actuate 65
the electric switch E.
of the oil in the cylinder I4 therefrom to the res
ervoir. When suf?cient oil has escaped to per
mit the piston I0 to fall a distance so that the
movable contact element 44 swings away from the
?xed contact element 43 the circuit with the sole
noid valvefis broken which deenergizes the same
to thereby close the valve and discontinue the
escape of the oil from the cylinder I4._ This dis
continues the downward or closing movement. of
crum point with-the lever 84 to thereby vary the
extent of movement of the thrust arm I08 with 70 the valve disks which are again maintained in
‘reference to the movement of the lever 84. For
The abutment element I09 is adjustable lon
gitudinally of the lever I04 for varying the ful
open suspended-relation.
this purpose a manipulating screw “0 is pro
'vidediwhich is swivelly mounted to the lower end
‘of the lever I04 with the threaded end thereof
The aforesaid operations will be automatically
repeated until the valve disks are in a position
where the required quantity of medium willfpass
“engaging an annulus III within the lever I04 for 75 through the valve into the system‘B to maintain
:the iipreiietennlned' .ipressure 1 therein, (whereupon
~thefappa'ratus .willibezin zequilibriumrand‘willrre
‘l'l‘he- system-:B may alsoibeeundertnegaitivespres
‘sure or below atmospheric pressure in which
' ?niainiin :equilibrium soi' long as :the “temperature
ev'ent‘the casing =I<23 connected with the'system
on :they outside of "the :enclosure zcontaim'ng :the
B‘ by piping I 24 as ‘illustrated: in 'FigureiG ' of the
v~system Bremainsbonstant.
.‘(If ithe‘f temperature at the locationof‘the bulb
drawings will be under negative pressure-inter
nally and the spring tit-functioning to normally
.IOI '1401' outside ‘of‘the enclosure : containing the
movethe head 85 and the piston-*80‘=-outwardly:is
rsystem Brincreases, the" thermal ?uid'withinithe
opposed byla, coiledrexpansionspring I25'which
bulb-willrexpand and "exertpressure on the; head
198 to lfOI‘CB .the same together :with' the 1 plunger
‘f81iiI1'Wa-I‘d1y which will rock the levers 1‘:84 and
-'I‘Mto-therebymove'the lever arm 3I08 inwardly
and rock the yoke 60 and 'rockilever 2591110 de
_press the actuator pin 54 and'bneak'thericircuit
is interposed between the head :85’ and “the: casing
I23 whereby the springsi88-and'l‘25 will vmove the
piston‘BIl in accordance-withvariations in/the
negative pressure in? the casing‘ I23.
:As 'hereinbefore‘described the abutment ele
ment I09 is movable longitudinally ‘of 'thedever
‘withithe motor. ‘This discontinues the operation
I04 so as to ‘adjust the relative-effects ‘Jot-‘the
"pffthegpump and the upwardimovement- of the
“valve stem whereby the. opening movement of the
movement of- the » plungers~80 andt-B I and; conse
‘valve.- disks ‘ceases "and the "same are maintained
quentlytherelative eirect of- the voutside‘tempera
tureof the bulb JIM/end the steam pressure “act
open‘ suspended "relation. ~ If v the temperature
ing on the plunger head 85. I As the-abutment ele
.at the locationl'of the bulb continues toinereasev 20 ment I09 is moved-inwardly toward thethrust
*thepressureon the-head ‘98 will increase with
arm~ID8Vby adjusting the knobiII'v-i, the-effector
~»a consequent ' further .' inward movement ' of the
the steampressure-onvth-e plungerheadr?i is
..plunger~8I whiohthroughthe yoke :60 and rock
increased,-that_ is,v a relatively large temperature
change surrounding the bulb - IOI .is required ‘to
‘lever 59><effects e farther‘downward movement/0f
~=t1he<actuator pin'54 to thereby closethe circuit
“with the solenoid valve‘ 22 whichcpens to vpermit
‘of thedischargeof the oil fromlthe-ocylindernlell.
This permits of the descent of the piston" I0 until
-~the circuit ‘with the solenoid valve is broken
: whereupon the valve closes and discontinues the
discharge of~the oil fromthe cylinder M'sothat'
vthe downward‘ movementof the valve disks will
g-ceasetand the isameiwilleagain be maintained-in
topen suspended‘relation-topermit of the passage
,of thel'medium .vtherethrough in accordance with
@the'requirement of the'temperature condition at
(thelocation-of the .bulb_
In- the .event that a decrease in‘pressure- oc
curs in "the system B or a decrease. inttempera
ture- occurs atlthe location of the bulb‘IllI, the
' pressure ,on the" heads I 85 . and F 98 I will vbe dimin
ishedthus permittingthe springs .88 and 103 to
»mov-;e : the plungers 80* and e 8 I - outwardly respec
tively l-toithereby-r relieve'the _ pressure on the yoke
“so: that the spring ‘I6 rocks the. same- upwardly.
This-.relievestthe pressure on the rock lever 59 so
~ that .the movable contact elementw44~ engages the
?xed contact element 42 to closeit'he circuit'w-ith
' -' themotor'vwhereby the pump C'is'started ‘and the
piston I 0 forced upwardly to effect-,a-widere-opem“
vingsiof 'the'valve ports. should'such changes in
:pressure and temperature occur simultaneously
thetlever 84 will be -rocked~in accordance-with
tthe sum total of the ‘movements of‘ the-plungers
80_.and-:8I :with a consequent‘ operation of the 1'. ._
\switchE anduaresultant movement of ,ther-v-alve
*stemifl >to=en1argeor decrease the valve ‘port
_ 1 Theppressure acting upon the piston head~85
‘to'move the plunger -80 maybe the pressure of
themediulnin the system B as hereinbefore de~
scribed :or- the same maybe the pressure set :upby
the velocityloflthe medium passing-through a
restricted ‘ori?ce in the systemr-B. In Eigureb
cause. an increment changein the steamipressure.
Conversely as the abutment element I09 is moved
outwardly or away-from the thrustvarm 108, the
effect of the steam ,pressureis decreased and‘that
of the bulb increased, so that‘in .this latter posi
tion ,arrelatively smallchange .of temperature *at
the bulb IOI eiTects thesameinorement otpres
sureehange on the plunger (head .85. Therefore,
by manipulating the knob H5,- itispossible-to
locate the abutment'element 109 so laslto supply
the correct amount of steam pressure (when the
temperature at the bulb I.0I variesffrom 70 de
grees F., down tothe predeterminedrlow tem
perature of 0 degree .F., oflillustration.
If ‘it is-found on certain. installations that l the
steam pressure is too high at 0 degreeiFL, byad
justing theknob\toireduce the
pressureor conversely if it is too. low, itispos
sible to increase the same. This, renders .it “pos
sible to adjust the-device so that the-same is
adaptable to varying pressure andttemperature
An outwardly opening relief. check valveIZ'Iis
threadedly secured in the casing-"83 in theitwo
forms of‘the inventionshown in ‘Figures 1 to ,5
inclusive of ‘the drawings and in thecasing'l23
in; the form of the invention shown in Figure 6
thereof, for relieving and exhausting to the at
mosphere the steam pressure therein when the
same becomes excessive or exceeds the “pres
sure set on the check valve.
The valve Ayhas its inlet end 33 connected with
a supply steam. line I28 and its outlet end“
connected with a pipeline I29 leading‘ to the
system “B. A ,by-passline, I30~having a shutoff
valve I'3I therein is provided which ‘connects
the supply steam line I28 with thespipeline .129
on opposite sidesof the steam valveA. Within
the loop formed by the by-pass' line I30, there is
interposeda strainer ‘I32 adjacent the vvalvelA
v"of .the drawings the casing .83 is! connectedwith w. -' and on opposite .sidestof the valveA. are shutoff
.thesystemB by'piping'v H9 having an open end
,-I20 located at thecenter of arestricted ori?ce
valves I33 and I34 adaptedto betclosedlforrdi
recting the: steam through’ the evby-pass vline "and
1:2] .in- the :system B with the said .open , end .- I20
around the valve-A when .theautomaticlcontrol
~ disposed‘ in confronting > relation to the direction
is not required in whichevent-the valve -I»3-I is
vofl?ow of themedium therein.
70 vopened.
The dynamic pressurelof themediumsinduced
:A room thermostat ' I35 .may/ her-located. ln-rany
ibynthe velocity of ~ the now thereofyat the ori?ce
.desired‘ipart of the :enclosure or building heated
by the system. B which thermostat‘ as>illustrated
JI‘ZI will bevtransmitted to thelhead. 85 of thee):
fpansible land’. contractibletube- \86 .for moving the
in Figure '7 'of theidrawingszmayi‘betinserted'fin
the conductor=2line~4r8~s0 thatrth-ezsame junctions
' 2,412,218.
to disconnect the circuit-with the switch ll when
the enclosure or building reaches a predetermined
temperature set on the thermostat ;to thereby
permit the valve A to close and discontinue the
flow of steam to the system B.
What is claimed is:
‘ 1.‘ In a control device, a valve for permitting
the passage of a mediumtherethrough to a re
the passagejof'amedium therethrough to a re
ceivena pressure creating means for actuat
ing ‘the valve by the pressure created there
by,v electrical means for driving said pressure
creating means, a‘ solenoid valve for vrelieving
the, pressure created by said pressure creating
means, an electrical switch in circuit with saidv
electrical means and said solenoid valve, a pair
ofrspacedplungers, means interposed between
ceiver, a pressure creating means foractuating
said valve, electrical means for driving said pres 19.: said receiver and one of said plungers and acted
upon'by and responsivev to the pressure of the
sure creating-means, an electrical switch in cir-_
medium in the receiver for moving said; plunger,
cuit with said electrical means, a pair of spaced
in response to pressure changes of the medium,
plungers, means interposed between said receiver
thermo-sensitive means located exteriorly of said
and one of said plungers and acted upon by and
1- receiver,’ means interposed between the~other
responsive to the pressure of the medium in the
plunger and ‘said 'thermo-sensitive means and
receiverfor moving said plunger in response to
responsive thereto for moving the same in re
pressure changes of the medium, thermo-sensi
sponse to temperature changes exteriorly of said
tive means located exteriorly of said receiver,
receiver, a lever connected at its opposite ends to
means interposed between the other plunger and
said thermo-sensitive means and responsive 20‘ said plungers respectively for pivotal movement
with each of said plungers and translatory move- ,
thereto for moving the same in response to tem
merit therewith, a second lever pivoted at one‘
perature changes exteriorly of said receiver, a
end for movement in a plane extending longi
lever connected at its opposite ends to said plung
tudinally through said ?rst named lever and hav
ers respectively for movement therewith, a sec
ing an‘abutment de?ning a fulcrum on which
ond lever pivoted at one end and having an abut
'said ?rst named lever rocks on relative move
mentj de?ning a fulcrum against which the ?rst
mentlof said plungers, said second named lever
named lever engages and means operatively en
swinging on its pivotal connection when the sum
gaging said second named lever, and said switch
total'of the movement of the plungers effect
for actuating said switch by the sum total of the
translatory movement of the ?rst named lever,
movements of said plungers effecting translatory
means operatively engaging said second named
movement of said ?rst named lever and swinging
lever and said switch for effecting actuation of"
movement, of said second named lever to thereby
said switch upon‘ swinging movement of said sec
control the operation of said electrical means and
ond named lever to thereby discontinue opera
the pressure creating means so as to maintain a
tion of said electrical means and the pressurev
flow of said medium in accordance with pressure
creating means whereby the valve, is maintained
requirements thereof and the temperature ex
in suspended open relation permitting the pas
teriorly of the receiver.
sage ,ofthe mediumtherethrough to the receiver,
.2. In a control device, a valve for permitting
said switch actuating means functioning on fur
the passage of a medium therethrough to av re
ceiver, a pressure creating means for actuating 40 ther swinging movement of said second named
lever to actuate the‘ switch to closethe circuit
said valve, electrical means for driving said pres
with said solenoid valve to thereby effect a re
sure creating means, an electrical switch in cir-_
duction of the pressure created by said pressure I
cuit with said electrical means, a pair of spaced
creating means, so as to limit the passage of the
plungers,~means interposedbetween said receiver _
andone of ‘said plungers and acted upon by and sh. Cl medium through said valve to the receiver for
automatically maintaining a ?ow of said medium
responsive to the pressure of the medium in, the
in accordance with pressure requirements there
receiver for moving said plunger, in response to ,
of;in the'receiver and the temperature exte-v
pressure vchanges of the medium, thermo-sensi
riorly of the receiver.~
, '
tive means‘ located exteriorly of said receiver,
means; interposed between the other plunger and 50
said; thermo-sensitive means and responsive
thereto for, moving the same in response to
temperature changes exteriorly of said receiver, 7
,4. In a control device, a valve for permitting
the passage of a medium-to a receiver, a pres
sure creating means for actuating the valve,
electrical means for driving said pressure creat
ingxmeans, anielectrical switch in circuit with
aslever‘ connected at its opposite ends to said
plungers respectively for movement therewith, a 55 said electrical means, a pair of spaced plung
second leverpivoted at one end and having an
ers, means interposed between said receiver and -
abutment, de?ning'a fulcrum against which the
one of said plungers and acted upon by and re
sponsive to the pressure of the medium in the
?rst named lever engages and rocks on relative
receiver for moving said plunger in response to
movement of said plungers, means operatively
engaging said second named lever and said switch 60 pressure changes of the medium, thermo-sensi
for actuating said switch by the sum total of the
movements of the said plungers effecting trans
latory movement of said ?rst named lever and‘
swinging movement of said second named lever
to thereby control the operation of said electri 65
cal means and the pressure creating means so
as to maintain a flow of said medium in ac
tive ~meahslocated ,exteriorly of said receiver,
means interposed between the other plunger and
said thermo-sensitive means ‘and responsive,
thereto for moving the same in response to tem
perature changes exteriorly of said receiver, a
lever connected at its opposite ends to said plung
ers respectively for pivotal movement with ref
erence to each of said plungers and for trans
latory; movement therewith, a second lever piv- .
said abutment being adjustable longitudinally of 7o oted at one end for movement in a plane ex
tending longitudinally through said ?rst named
said second named lever for varying the ful
lever and having an abutment de?ning a ful
crum point with the ?rst named lever to there
crum on which said ?rst named lever rocks on
by vary the pressure of the medium in the re
relative movement of said plungers, said second
3. In a control device, a valve for permitting 75 named lever swinging on its pivotal connection
cordance with'pressure requirements thereof and
the temperature exteriorlyyof ‘the receiver and
winters: '
upon- translatory ' movement I of said ?rst named?
cordance ‘with = pressure- changes “of the lm'ediuml
lever, means operatively ‘engaging said second
named lever‘andisaid switchior effecting‘ actu
anon/pf. said switch upon swinging-1 movement
riorly: thereof; and-1 said abutmentibeing adjusts-V
o'ii-ls‘aid 1 second» named 'lever- to thereby discon“—-
tinueoperationwof said electrical means and said
_ pressure-‘creating means whereby’ the valve. is
in: the receiver and? temperature changes ~ ext‘e'é
able longitudinally/‘of saidisecondnamed'leveri'for"
regulating the devicestorend‘er'the sameradapt
able for varying pressure and ‘temperature ranges.
7. In‘ acontroldevice, a valvetfor permitting
theipassag'e ofamedium therethrough' to. ajre~
maintained in open relation (permitting the pas‘
sage of thermedium therethrough to the receiver
ceiver; means‘. for‘ actuating said‘valve, ‘electria
so‘lpa‘s'rto maintain a'?owof‘» the medium in ac 10 cal»; means for-“operating saidi valvev actuating.‘v
means; an'electricaliswitch in circuit‘withsaidi
cordance» with --the pressure requirements there»
electrical means; ap'air of spaced plungers, means:
ofl-in-fthe- receiver and the‘ temperature exte
interposed between said receiver? and‘ one ‘of. said"
riorlyg‘ot the receiver.
plungers- and acted upon by and. responsive i't‘o
;In a control device,‘ a‘ valve for permitting‘
thelpassage ofFa medium: therethrough to a re 15' the-lpressure'lofi the medium in the receiverrtor
moving» said» plungerv in response‘ to pressure‘
ceiver; a- pressure creatingmeanslfor actuating
said valve; electrical means‘ior driving said press'urei'creating‘meansian electrical switch in cir
cuit'lwitl'isaidlelectrical means, a pair ofspaced
posedibetween'the- other plunger. and said‘thermoe
elements; means interposed between said‘v re
ceiver andoneof said elements. and acted upon
' sensitivemeans ‘and responsive thereto for mov
ing ‘the 1 same in response to ‘ temperature changes 1.
byiand/responsive to'the pressure ofithe-medium
ini-tht'e" receiver‘ for moving saidielement inv re
sp'On'seF-to pressure changes of» the medium,
thermo-sensitive meanselocat‘ed exteriorly of said
receiver,‘- means interposed between the other
element and saidithermo-sensitivemeans and re
sponsivethereto formovin'g the @same in response
changes vof‘th'e medium, thermo-sensitive means:
locatedexterliorly of's'aid receiver,‘ means-inter»
exteriorly of said receiver, a lever connected to’
said-plungers atsp'aced' longitudinal points there'
on; a second lever mounted for swinging move‘
ment,~ an- abutment arranged between said ‘levers.
and3 de?ning’ a fulcrum th‘erebetween on which
saidl?rst named lever-rocks; means operatively‘
engaging-said second named'lever and said switch
toetemperature‘:changes of said ‘receiver, a- lever
forv actuating said switch by the movements of‘
connected:atlits-opposite ‘ ends to saidclements
said plungers e?ectingimovement of said? levers
respectivelylfor movementstherewith, a- second
to ‘ therebyr control the: operation‘: of. said electri
cal‘means and thevalve. actuating means so as.
lever pivotedl for swinging movement-and hav
ing-anabutment ide?ning-afulcrum against which
namedi‘lever ' engages» and means opera-v
tively¢engaging said ‘second named 'lever and'said
to regulate the‘ flow off the medium through the,
valve, in accordance with‘ pressure changes of
the -’ medium1 in. the receiver." and‘ temperature
switch-i for‘ actuating said. switch byv the move
changes ext'er-iorly thereof, and-saidabutmentbe
ments #01‘? said elements; e?ecting: movement’ of
ing adjustable longitudinally» of‘said' levers for
regulating the-device to render thesame adapt
able for-varying pressure and temperature ranges.
said" levers’ to=thereby control the operation of
said‘lelectrical meanszand-the' pressure creating
m'eans'so'as to maintainwav?ow- of saidmedium
through saidivalve--in-1 accordance with pressure
requirements thereofiin the receiver and the vternpératureext'eriorly- of the-receiver.
In aecontrolfdevice. a~valve~ for permitting
the-passage ofi'a ~ medium vetherethrough ‘to a -re- ~ 45
ceiverg-m'eans for actuating said valve, electrical
means ror: operating saidivalve actuating means;
an'i-electri'cal switch inicircuit with~said electri
’ 8'." In- a control device, a‘ valve for permitting
> the'passage of ‘a’ medium therethrough to a re-‘
ceiver; pressure creatingmeans for actuatingsaid'»
valve; means for’' driving said pressure creating
means‘and means controllingsaid driving means,
saidlast namedmeans including a pair of spaced
. elements-g means inter-posedbetween'said receiver
cal means, a pair of spaced-plungersi means in
and 'o'ne‘ofis‘aid elements and acted‘upon by and
movablelinjresponseltothe pressure of the me
diu-rnethe' receiver. forv moving said- element in
terposed-between said “receiver: and one of! said
response to ‘ pressure‘ changes of“ the medium»,
plun'g'ers vandia'ct'ed; upon-by and responsive to.‘
thermoi-sensit'ive vmeans locatedexteriorly of said’
receiver-,- means interposed'between the other ele
. th‘e'itp‘ressure .ot. the'medium in the receiver for
moving saidap'lunger' in, response-to v-pressure
changesfoftthe medium; thermo-sen‘sitive means.
located'gexteriorly. of; said-:re'ceiven, meanslinteri- - ,
ment and said thermo~sensitive means and re
sponsive thereto for moving‘ the same in re
' spouse to temperature changes exteriorly of said‘
posed between the other plunger and said thermo
receiver», a» lever connected at-its opposite ends
sensitivem'ean's andresponsive thereto‘for mov
tosaid-elements respectively for movement there-- 1
with; a=-second' lever pivoted-1 for swinging move
ingith'e; same/in‘ response torttemperature changes‘
exteriorly of saidreceiver; a lever. connected- at
' ment’ and providing a/ful‘crum against which the
its-~opposite~ ends to- said plungers respectively 60' first" named lever engages, and interen‘gageable
fo'r'f'mo'v'e'rnent therewith, a second lever having an
abutmentde?ning a fulcrum against which the
means‘- between said secondlnamed' lever ‘ and said
driving means for controlling the driving means
so-as‘ to maintain a flow of said medium through
said’valve" in accordance with’ pressurev require-'
saidfsecond-named lever andsaid switch for act'u-l
ating-fs'aidswitch'by the movements of said- plun'g-~ 65 mentsvin the receiver‘ and the temperature ‘exte
ersie?‘e'cting movement of. said» levers to thereby
riorly of»- they receiver.
con-trollthe operation of‘ said electrical means
I i
andvalvelactuatingmeans'so as to regulate" the
?o‘wiio‘f; the medium through the valve in‘ ac‘
?rst» leven'engages, means operatively engaging
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