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Патент USA US2407891

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Sept. 17, 1946.
2,407,890
G. T. MCCLURE
PROTEGTION’VALVE DEVICE
Filed March 15, 1945
à-.„\É,
.o
INVENTOR,
Glenn ÍMcCZu're
BY
_
ATTURNEY
Patented Sept. 17, 1946
` 2,407,890
UNITED STATES PATENT OFFICE
PROTECTION VALVE DEVICE
Glenn T. McClure, McKeesport, Pa., assignor to
The Westinghouse Air Brake Company, Wil
merding, Pa., a corporation of Pennsylvania '
Application March 15, 1945, Serial N0. 582,934
11 Claims. (Cl. 30S-«84)
1
2
This invention relates to fluid pressure brakes,
and more particularlyto an air brake equipment
locomotive unit in the event that the compressor
of the type employed on a railway locomotive. i
A further object is to provide means operative
to permit the flow of fluid under pressure from
Diesel-powered locomotivesfor certain classes
on the leading unit should fail.
„
l
Y
-
of railway service in some instances comprise a
the main reservoirs on the first locomotive‘unit
plurality of individual power'units coupled to
gether. For example, a complete Diesel locomo
through the main reservoir pipe to the reservoirs
on the trailing locomotive units only after _the
tive may consist of one “A” (control) unit cou
ñuid under pressure in the reservoirs on the first
pled to first and second “B” (auxiliary) units,
locomotive unit attains a selected degree of prese
all three power units carrying engine equipments 10 sure and operative thereafter when the ñuid
controlled from the “A” unit. Diesel locomotives
pressure in the main reservoir pipe is- reduced
of `this class are operative to exert great tractive
to a chosen lower degree to prevent the flow of
effort. particularly` at low speeds. Although such
iiuid under pressure from the reservoirs on the
Diesel locomotives are regularly operated to great
ñrst unit to the main reservoir pipe, which means
advantage and` without undue risk of separation
maybe readily installed in an existing` brake
of the several units, actual experience has dem
equipment for cooperation with standard brake
onstrated that suchV an accident is possible,- and
controlling devices without impairing the normal
that the leading portion’of a Diesel locomotive
functioning of the apparatus.
l 1 v- ~
might break away from the other units and the
Other objects and advantages will be appar
rest of the train. The engineer stationed in the 20 ent in the following more detailed description of
leading portion may in fact be unaware that a
break-in-two has occurred, by reason of the
enormous power which that unit delivers, and as
the invention.
l'
‘
The single figure in the accompanying draw'
ing is a diagrammatic view, partly in section,> of
a result, the parting of the main reservoir pipe
a protection valve device constructed in accord-'
between the separated units of the locomotive 25 ance with the invention and associatedwith such
may seriously impair his control of the brake
portions of the air brake equipment of a` multi
equipment, The locomotive brake equipment on
ple unit Diesel locomotive as concern the invent
a multiple unit Diesel locomotive is, of course, de
tion.
A
signed to operate automatically upon parting of
In the drawing, the reference numerals I and
the brake pipe to effect an emergency applica 30 2 indicate a pair of main reservoirs which are
`tion of the brakes, but if the engineer is un
carried on the leading locomotive unit and com
aware of a break-in-two and consequently allows
prise a part of the usual air brake equipment
his brake valve to remain in running, position,
(not shown) thereon. The main reservoirs land
and if, as is usually the case, the controlled
2 are connected by means of a pipe 3 vto aprœ
emergency feature of the equipment has been set 35 tection valve device 4, which device operates to
for freight service to permit only a slow rate of
control communication between the pipe 3 and
brake cylinder pressure development, the loss of
a main reservoir pipe 5, as will hereinafter more
main reservoir pressure through the broken main
fully appear. A check valve device 6 is` provided
reservoir pipe will in a short time seriously limit
to prevent a back flow of fluid under` pressure
the brake cylinder pressure obtainable in the 40 from the main reservoir 2 to the pipe 3, the main
leading portion of the locomotive.
reservoir 2 being provided for the purpose of
It is an object of my invention to provide an
storing fluid under pressure to be supplied by
improved locomotive brake equipment designed
way of pipe 'l to the usual air brake equipment
for Diesel units of the above identified class, in
(not shown) installed on the leading unit of a
cluding means operative to prevent brake fail 45 Diesel locomotive. The main reservoir pipe 5
ures of this nature.
_
'
comprises a section 8, carried on the leading 1o
Another object of the invention is to provide
comotive unit, Aand a section 9 carried on the
an improved protection `valve device operative
trailing locomotive unit, the sections 8 and 9
to prevent complete loss of main reservoir pres
being connected by a coupling means I 0. The
sure in the leading locomotive in case of a train 50 section 9 is connected'to another main.- reservoir ‘
break-inftwo.
‘
Another object is to provide an improved pro'
tection valve device operative to supply fluid un
der pressure from the main `reservoirs of the
trailing locomotive units to those of the leading
l I which comprises a part of the usual air brake
equipment (not shown) for the trailing locomo
tive unit. It` will’be understood that the main
reservoirs l and 2 are adapted to be charged with
ñuid under pressure delivered by way of a pipe
2,407,890
3
I2 from a compressor (not shown) >mounted on
the leading locomotive unit and the main reser
voir II is adapted to be charged with fluid under
pressure from a suitable compressor (not shown)
mounted on the trailing locomotive unit.
The protection valve device 4 may comprise a
base structure I3 supporting a casing structure
4
V
between a surface 41 of the member 46 and a
shoulder 48 provided in the peripheral wall of the
chamber 31, as shown Yin the drawing.v
The spring seat member 44 slidably engages a
stud portion 49 of the follower member 43 for
the purpose of retaining the spring 45-in opera
tive engagement with the follower 43 and also for
I4 and containing a, supply chamber |.5„_Áwhich
limiting, in a manner Íto. be explained later, the
chamber'i-s in constant4v open communication with
upward travel ofV a pistongmember ¿50 ‘mounted
the main reservoir I by way of the pipe 3'. Con
in the chamber 33. The member 44> i's'substan
tially tubular inshape having its upper end 5I
turned inwardly forV engagement with a washer
tained in the supply chamber I5 is a supply con
trol valve I6, which valve cooperates with a valve
seat I1, formed on the end of a bushing I8, t0v
control communication by way of said bushing
between the supply chamber I5 and _a passage I9.,_.
which passage connects with thel main reservoir
pipe 8.
Formed in the casing structure I4 is a strainer
and check Valve chamber 20, which chamber is
` `52 secured to' the stud portion 49 to thereby limit
the downward movement of the member 44 and
, having'its lower end 53 ñared outwardly for sup
pQrtìI'lgj andretaihing the spring 45 at its lower
end.
`
f
.The piston member 5I] is substantially cup
shaped for accommodating the lower ends of the
in constant open communication with the supply 20 spring 45 and seat member 44 and abuts the
chamber I5 by way of a passage 2I and with a
diaphragm chamber 23 by way of a-passage 22.
For the protection of the passage 22 against the
passing` of dirt therethrough there is provided in
chamber 20 a wire screen strainer 24 which is
clamped between two sectionsof the casing struc
turev I 4f. Also contained in the chamber 2u is a
ball check valve 25 arranged for operative engage
ment with a valve seat 26 formed in a suitable
bushing 21' mounted in the casing structure I4, .
the under side of the‘check valve 25 being in com
bottom surface of kthe seat member for propelling '
the same upwardly until the upper end 5I thereof
engages the follower 43.. A'sealing ring 54 is pro'
Vided in» an annular groove in the periphery of '
the piston‘member 50 for preventing the leak
age of iluid'under pressure from the chamber 33
to the atmospheric chamber 31. The piston mem
ber 58 is further provided with a downwardlyïex
tending steinv 55 which is slidably 'mounted in a
through bushing 56 in a` wall in the casing struc- Y
ture I 4 and extends transversely through thepas
sage I9 andv bushing I8 into the supply passage
I5. The stem 55 is also provided with a sealing'
sage 28 and a chamber 29. For the protection of
ring' 51 for preventing leakage of iiuid under pres
Ythe valve device 4 and the other air brake equip
sure between the passage I9 andV chamber 33.
ment when iiuid under pressure from the main
Secured by means of a pin 58 and a retaining
reservoir pipe» 5 flows past the check valve 25, as
spring or clip 59 to the lower end -of the stem
will hereinafter more fully appear, a tubular air
cleaner or' strainer 30 of the cartridge type is
55 of the piston member 5U is the valve I5 which,
asl will' later appear, may be operated thereby into
mounted in the chamber 29-so as to have its inner
peripheryA open to the passage 28 and its outer 40 engagement with the valve seat I 1. It is pre
periphery exposed to the passage I9. Upon re'
ferred that the clearances in the mounting means
munication with the passage I9 by way of a pas
l moval of a cap nut 3I which closes the outer end
of the chamber 29 and hassealing engagement
with one end ofthe strainer 30, the strainer may
be readilyl removedv for cleaning.
Clamped‘ at> its periphery between two sections
ofthe' casing structure I4 is a flexible diaphragm
32 having at: its upper side the chamber 23, which
chamber is constantly open to the chamber- 28
by way of the passage 22'A and, as shown, maybe
connected to'a piston chamber 33 byY way’ of a
Valve chamber 34. and` a. passage 35, they passage
35. beingV open to atmosphere also by way of a
choke- 3B?. At; the, under side of' thel diaphragm
is» a. spring> chamber 31 which i's constantly> open
to atmosphere by way.y of-a passage 38.
of the valve I Ii beisuflicient to permitthe valve
tov be> self-aligning in its operation.
»
In charging the locomotive with fluid under
pressure and' under normal conditions, ñuid un
der pressure is supplied from the usual compres
sor (not shown) on the leadinglocomotive to the
main reservoir Iï by' way of theV pipe I2 and iiows
therefrom by wayy ofthe pipe 3, check valve de*
vice 6, and a pipe 60 to the main reservoir» 2,
from which fluid under pressure is supplied by
way of pipe 1 to the usual air brake control equip
ment found on the leading unit of' a Diesel loco-Ãmotive. Fluid under pressure also flows from pipe
3 through a passage 6I to the supply chamber
I5 of the protection valve device 4. At the same
Contained> in the valve chamber 34 is a valve
'time' fluid under pressure is also supplied to the
39A having a fluted': stem 40 which extends through
main reservoir- I`I on the trailing unit by the op
a suitable.’ bore in the casing so that its- lower
eration of auxiliary compressor meang` (not
endY may be . operativelyA engaged by the dia 60 shown) mounted' on that'unit.
Y
‘
phragmv 32. Interposed between and operatively
Fluid under pressure supplied to the chamber
engagingy a cap nut 42| at the top of the >chamber
34 and' the; valve 39 is a springY 42 which urges
I5 of the protection valve device 4 flows from
that chamber by way of the passage 2l to the
chamber 28, thence by> way of a choke 62, in'
said‘ valve toward its seated position.
Contained: in the,` chamber 31I andV interposed
betweenl a diaphragmv follower 43 and a spring
seat; member 424 isl aL compression spring 45, which,
asY will hereinafter more fully» appear, serves to
establish they degrees of fluid pressure in the sup
ply chamber> I5 at: which the Valve I6- will be
, opened or closed'.
The` follower 43 is slidably
serted in passage 22 for reasons which will appear
later, and the passage 22 to the diaphragm cham
ber 23, whence it will flow past the fiuted stem 40
and valve 39 to the piston chamber V33 by way of
>the passage 35. Fluid under pressure being sup
plied to the piston‘chamber 33 will also iiow to
atmosphere by way of choke 35 at a, restricted.
guided-»in an annular member 46, the _member
.46 Aalso serving as amedium for clamping the dia
initial charging', fluid under pressure in'cham'ber ’
phragm 32' andl being arranged in the chamber 31
so, as~ to coniine. the travel of the' follower'43
the bushing- I3, chamber I9 and main reservoir
rate.
The valve I6 being unseated as shown» at '
I5 may-'also lflow to main reservoir II by Way of
2,407,890
6
‘ pipe 5, if the iluid‘pressure in the main reservoir
>the fluid pressure therein to be rapidly depleted.
II is‘lower, such `as when the compressor (not
It will be apparenttherefore that substantiallyV
shown) on the trailing unit is not operating.
Since the degree of iluid pressure in the cham
the full force of the spring 45 will be effective at
once to open the valve I6 promptly.
It should be further explained that any tem
porary ñuid pressure vdrop in the chamber I5,
which' might be caused by the sudden opening of
‘ bers 23 and 33 is substantially the same and, the ï
effective area of the piston member 5l) is greater
than that of the diaphragm 32, the piston mem
ber 5I] will respond to a lower degree of ñuid pres
sure than will the diaphragm 32. It will here be
the valve I6, especially with a high pressure dif
ferential across it, will not, due to the how re
understood that the relative flow capacities of 10 stricting choke (i2,v result in a corresponding re
chokes ‘B2 and 3B are such that the flow of fluid
duction in the pressure of fluid in diaphragm
under pressure through choke 52 will be sufficient
chamber 23, thus insuring against anlundesirable
`to maintain the fluid pressure acting on the pis«
operation of the diaphragm 32 and the piston
ton member 53 at approximately that of the
member 53 to again close the valve i6. Thus the
main reservoir against the flow of fluid under 15 choke 62 serves to stabilize the diaphragm so that
pressure to atmosphere through choke 33. When
communication from the main reservoir I to the
`the pressure of fluid in the chamber 3.3 ‘has
piston chamber 33 is maintained closed :and the
> reached a chosen degree (22 pounds for example)
communication from main reservoir I to the
l as determined by the valve of the spring 45, the
main reservoir I I `is maintained open against ac
piston member 56 will move the spring seat mem 20 cidental movement.
i
ber 44 upwardly against `the opposing pressure of
the spring 45 until the valve I5 engages the valve
,ls'eat I1. With this movement the piston member
“50 acts through the medium of its stem 55 and
`the pin 58 to move the valve I6 into sealing en
gagement with' the valve seat I'I, closing commu
nication between the chambers I5 and I9 and
thus between mainreservoir I and main reser
If, however, the main reservoir line` 5 is broken
or opened to the atmosphere as by the accidental
separation of the locomotive units, fluid under
pressure in the main reservoir I will flow to at
25
mosphere by way of the pipe 3, protection valve
device il, and the undesired rupture in the main
reservoir pipe 5. The resulting reductionin the
fluid pressure in chamber I5 of the valve device
4 will cause fluid under pressure to flow from the
`diaphragm chamber 23 by way of passage 22,
However, fluid under pressure will continue to
flow from chamber I5 to chambers 23 and 33 by
choke 62, chamber 23 and passage 2| to chamber
the route previously described. When the pres
i5 and thence to atmosphere by way of bushing
sure of fluid in the diaphragm chamber 23 has
I3, passage I3 and main reservoir pipe 5. When
attained a higher chosen degree, such as 100
the pressure of fluid in chamber 23 has been re
pounds, th‘e diaphragm 32 will deflect downward 35 duced to some chosen low degree such as eighty
pounds, the predominant pressure of the spring
ly in response thereto, causing the follower 43 to
move downwardly until stopped by the engage
35 will cause the diaphragml32 to deillect up
wardly and act through the medium of the stem
ment of the lower outer` surface thereof with the
dû to move the valve 39 against the opposing
shoulder 48 in the chamber 3l. It should be
noted that the spring 45 had previously been 40 pressure of the spring 42 to itsunseated position
compressed a certain amount due to the upward
in which it is shown in the drawing.
-movement of the piston member 58,' consequently
With the valve 39 unseated, fluid under pres
sure in diaphragm chamber 23, and consequently
`theforce of the spring acting to oppose the down
ward deflection of th'e diaphragm was corre
fluid under pressure in chamber I5 connected to
spondingly increased.
chamber 23 by way of passage ZI, chamber 2l),
choke G2 and passage 22, will flow to the piston
Upon the deflection of the diaphragm 32 to its
chamber 33. In response to the fluid pressure
lower position the spring 42 will act to move the
acting on the piston member 5I), the piston mem-^
valve 39 from the position in which it is shown4
ber will move upwardly against the opposing
.to its lower seated position, closing commmuni
pressure of the spring 45. This movement of
`cation between chambers 23 and 33. This is the
the piston member will cause the valve IIS to again
normal position for valve 39 on a leading unit
engage the valve seat I'I, thus preventing fur
with the brake equipment thereof fully charged.
ther loss of fluid under pressure from the mainV .
Fluid under pressure in the piston chamber 33
reservoir I by way of pipe 5.
,
and the passage 35 will continue to now to atmos
ph'ere by way of the choke 36, thereby reducing
The reduction` in the pressure of fluid inthe
the fluid pressure in chamber 33. When the
main reservoir I will cause the compressor on
the leading locomotive unit to start operating in
»pressure of ñuid in the chamber 33 acting on the
`lower side of the piston member 50 decreases be
the usual manner. This action in combination
low the pressure of the spring 45 acting on the
with the closing of the valve I5 might, if the choke
upper side of the piston member, the springwill 60 52 were not employed, cause a rapid increase in
`act to move the piston member downwardly to
the fluid pressure‘in the diaphragm chamber 23
-the position in which it is shown in the drawing.
causing the valve 43 to seat and the valve I6 to .
open again before the fault causing the loss of
The downward movement of the piston member
`will cause the valve I5 to assume the position in
fluid under pressure had been corrected. There
which it is shown, this being the normal position 65 'would then follow another reductionv in fluid
4for `valve I6 on a leading unit with the brake
Lpressure and a consequent rapid pumping action.
This rapid pumping action is obviated yby the
equipment thereof fully charged. Communica
effect of the choke 62 in the passage `22 which
tion is again established between the main reser
>delays the> pressure build-up in the chamber 23
voir I on the leading unit and the main reservoir
and thereby lengthens the time interval between
1 I I on the trailing unit by way of pipe 3, passage
the closing and opening of the valve IS.
6I, chamber I5, bushing I8, passage I3 and main
As previously noted, the effective area of` the
‘reservoir pipe 5.
piston member 53 is considerably greater than
It will be understood that th'e volume of the
that of the diaphragm 32. For this reason and
passage 35 and the chamber 33 is relatively small
‘and that consequently the choke 35 will cause 75 also because chamber 33 is at atmospheric pres
2,407,890
8
7
sure 4and the pressure of the spring 4.5 has been
reduced by the upward movementI of Athe dia
phragm, Ythe piston member will exert a force
greatly in excess of that required to propel the
valve I6 to its seated position. This excess of
force is desired to insure the seating of the valve
l‘even though it or the- valve seat I'I might be dirty
.and :covered with sludge which usually accumu
lates in the communicating pipes of a fluid pres
.,sure brake system.
closing said valve, a spring urging the'movable
abutment in ya direction for opening -said valve,
and valve means for controlling communication
between one of said two passages and said mov
able abutment means, said valve means being re
sponsive to a reduction in iluid Apressure in vsaid
one passage to a predetermined degree to open
the latter communication and responsive to an
increase in fluid pressure in said one passage to
r10 a predetermined higher degree to close the latter
Assuming now that the compressor means on
communication.
2. The combination with a fluid conducting
`inoperative and that the compressor means on
conduit normally charged with ñuid under pres
the trailing unit is operating to supply fluid under
sure, of a valve device comprising a casing having
pressure to the main reservoir I I, the various
two communicating passages constituting a por
parts of the protection valve device 4 will be in
tion of -said conduit, a valve operative to open`
¿the positions in which they are shown in -the
and close the communication between said pas
drawing. Fluid under pressure in the main res
sages, movable abutment means for actuating
ervoir II will flow therefrom to the main reser
said valve and operative in response to ?luid'pres'
voir I by way of the main reservoir pipe 5, passage 20 sure for closing said valve, a spring urging the
I9, bushing I8, chamber I5, passage 6I and pipe
movable abutment in a direction for opening said
V3 until the exemplary 22 pounds are reached, at
valve, valve means for controlling communica
which ytime the valve I6 will be operated to its
tion between one of said two passages and vsaid
`seated position in the same manner as herein
movable abutment means, said valve means being
lbefore described for 22 pounds of main reservoir 25 responsive to a reduction in ñuid pressure in said '
pressure during the initial charging of the loco
one passage to a predetermined degree to open
motive.
'
the latter communication and responsive to an
:the leading locomotive unit has been rendered
. However, although the flow of iiuid under pres
-increase in fluid pressure in said one passage to
sure above 22 pounds from the main reservoir II
a predetermined higher degree to close the latter
to the main reservoir I is interrupted at valve I6, 30 communication, and means for reducing the lpres
this flow `will continue from passage I9, and res
sure of fluid acting on said movable abutment
ervoir II, 'by Way of strainer 3G in chamber 29,
passage 28, past ball check valve 25, chamberZIì,
passage 2I, chamber I5, passage 6I and pipe 3.
means.
’
3. In a fluid pressure flow control valve device
comprising a casing having two connected pas
When a ñuid pressure of 100 Ypounds is attained 35 sages through which ñuid under pressure may
in the main reservoir I and a camber 23 of the
flow from one section of a fluid conduit to :an
protection valve 4, the same operation for unseat
other spaced section of the conduit, a valve
ing the valve I6 will take place as previously
mounted in said casing and operative to one po
described in connection with the initial charging
sition to close communication between said `pas
Of `the locomotive.
It will thus be seen that the greatest possible
protection for the braking means on the leading
unit of the locomotive against loss of fluid under
pressure is provided by the protection valve device
' 4 embodying the invention. It prevents the pass
sages and operative to another position to open
communication between said passages, means
responsive to the pressure of fluid in one of said
passages for actuating said valve to its closed po
sition and responsive to a reduction in the pres
sure of fluid acting thereon for actuating said
ing of fluid under pressure from the first main
reservoir to the main reservoir pipe until oper
ating pressures with a marginal degree of safety
are available; When, due to some failure behind
valve to its open position, a second Valve having
a position for establishing communication
through which the -fluid under pressure in said
one passage may be supplied to said means and
the leading locomotive unit, the margin of safety 50 having a position for closing said communication,
is lost the main reservoir I will again be segre
a movable member responsive to an increase in
gated from the main reservoir pipe leading to the
fluid pressure in said one passage toa chosen
trailing locomotive units. If, for any reason, the
degree for eiïecting .the operation of said second
`fluid pressure supply to the ñrst main reservoir
valve to its communication closing position and
`should fail and fluid Vunder pressure is available 55 responsive to a reduction in the 'ñuid pressure in
in any of the trailing units, the protection valve
said one passage for effecting the operationrof
-device will then operate -to supply Iluid under
said second valve to its communication establish
pressure from the main reservoir pipe to the ñrst
ing position, and means for reducing the pressure
main reservoir. Upon attaining safe operating
of fluid acting on said means.
Y
pressures in the ñrst main reservoir, the protect 60
4. In a fluid pressure flow control valve device
ing valve device will again function to retain those
having two connected passages adapted to estab
ypressures if the ñuid under pressure in the main
lish communication between two ñuid conducting
reservoir pipe is being depleted beyond a safe
conduits, a valve operative to one position lto close
degree.
«
the connection between said passages and opera
Having now described my invention, what I 65 tive to another position for opening the com
claim as new and desire to secure by Letters Pat
munication between said passages, means oper
ent, is:
ative by ñuid under pressure from one of vsaid
passages for actuating said valve to close the con
nection between said passages and operative upon
a reduction in the pressure ,of ñuid supplied
thereto for-actuating said valve to open the con
nection between said passages, valve means re
sponsive to variations in the pressure of Afluid in
-said one passage for controlling the pressure -of
iluid acting on the ñrst mentioned means„a pas
1. The combination with a fluid conducting
conduit normally charged with fluid under pres
sure, of a valve device comprising a casing having
two communicating passages constituting a por
tion of said conduit, a valve operative to open and
close the communication between said passages,
movable abutment means for actuating said valve
and> operative in response to fluid pressure for
2,407,890
sage by-passing sald valve and leading from the
other of said passages to said one passage through
which fluid under pressure may flow from said
other passage to said one passage when said valve
of fluid pressure acting thereon to interrupt said
supply, thereby causing the first mentioned means
to` operate said valve to open said connection,
is Iclosed, and means interposed in the by-pass
passage 4for preventing the ñow of fluid there
said'valve means being conditioned as an inci
dent to the opening of said valve to respond to
a degree of fluid pressure acting thereon lower
through from said one passage to said other pas
than said certain degree for again supplying fluid
sage.
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A
I
_
Y
under pressure from said one passage to the ñrst
„5. In a Vfiuid pressure flow control valve device
mentionedmeans, means for controlling the rate
having `two connected passages adapted to estab 10 at which fluid is supplied to said valve means to
lish communication between two fluid conducting
prevent the pressure in said valve means from
conduits, a valve operative to one position to close
being varied prematurely.
the connection between saidfpassages and opera-_l
A3. The combination with a fluid conducting
tive to another position for opening` the connec
conduit, ofga fluid pressure iiow control valve
tion between said passages, means operative by 15 device comprising a casing having two connect
fluid under pressure from one of said passages for
ed `passages constituting Va portion of said con
actuating said valve to close the connection be
duit, a valve operable to open and close the con
tween said passages and operative upon a reduc
nection between said passages, a movable mem
tion in the pressure of fluid supplied thereto for
ber responsive to iiuid pressure for operating said
actuating said valve to openthe connection be 20 valve to close said connection and responsive to
tween said passages, valve means responsive to
a reduction in the fiuid pressure for operating
variations in the pressure of fluid in said one pas
said valve to open said connection, means for ,
sage for controlling the pressure of ;ñuid acting
reducing the iluid pressure acting on the mov
able member at a relatively slow rate, and valve
means responsive to variations in the pressure of
. on the ñrst mentioned means, a passage by-pass
ing said valve and leading from the other ofsaid
passages to said one passage through which fluid
under pressure may ñow from said other passage
to said one passage j when said valve is closed,
means interposed in the by-pass passage for pre
venting the ñow of fluid therethrough from said
fluid in said one-passage to control the supply of
fluid under pressure from said` one passage to
said movable member and thereby the ñuidpres
sure acting on said movable member, said valve
30 means being _operative in >response to a `cer-,v
one passage to said other passage, and fluid
tain degree of fluid pressure to supply fluid un
cleaning means interposed in the by-pass passage
der pressure to said movable member to eiîect
at a point located between said other passage
the operation of said valve to close said connec
and the last mentioned means.
tion and being conditioned as an incident to the
6. The combination with a iluid conducting
connection closing operation of said valve to be
conduit of a iluid pressure flow control valve de
operative at a degree of fluid pressure higher
vice comprising a casing having two fluid flow
-than said certain degree to interrupt the supply
connecting passages constituting a portion of
of fluid under pressure from said one passage to
said movable member.
‘
said conduit, a valve operable to open and close
the iiuid flow connection between said passages, 40
9. The combination with a fluid conducting
means responsive to fluid pressure for- operating
conduit, of a fluid pressure flow control valve
said valve to close said connection and respon
device comprising a casing having two connected
sive to a reduction in fluid pressure for operating
passages constituting a portion of said conduit,
said valve to open said connection, means for
a valve operable to open and close the connection
reducing the fluid pressure acting on the first 45 betweenV said passages, a movable member re
mentioned means at a relativ'ely slow rate, and
sponsive to fluid pressure for operating said valve
valve means operative to supply fluid under pres
to close said connection and responsive to a re
sure from said one passage to the ñrst mentioned
duction in the fluid pressure for operating said
4 means to effect the operation to close said valve
valve to open said connection, means for reduc
and operative in response to a certain degree
ing the fluid pressure acting on the movable
of fluid pressure acting thereon to interrupt said
member at a relatively slow rate, valve means re
supply, thereby causing the ñrst mentioned means
sponsive to variations in the pressure of iluid in
to operate said valve to open said connection,
said one passage to control the supply of fluid
said valve means being conditioned as an inci
under pressure from said ‘one passage to said
dent to the opening of said valve to respond to
a degree of fluid pressure acting thereon lower
movable member and thereby the ñuid pressure
acting on said movable member, said valve means
than said certain degree for again supplying fluid
being operative in response to a certain degree
under pressure from said one passage to the ñrst
of fluid pressure to supply fluid under pressure
mentioned means.
`
to said movable member to effect the operation
7.' The combination with a fluid conducting 60 of said valve to close said connection and being
conduit of a fluid pressure iiow control valve de
conditioned as an incident to the connection
vice comprising a casing having-two fiuid ilow
connecting passages constituting a portion of said
a degree of fluid pressure higher than said cer
closing operation of said valve to~be operative at
conduit, a valve operable to open and clos-e the
tain degree to interrupt the supply of ñuíd under
fiuid flow connection between said passages,
pressure from said one passage to said movable
means responsive to liuid pressure for operating
member, and means for restricting -the rate at
said valve to close said connection and respon
which fluid under pressure is supplied to the valve
sive to a reduction in fluid pressure for operat
means to prevent the pressure of fluid in said
ing said valve to open said connection, means
valve means from increasing at such a fast rate
for reducing the fluid pressure acting on the first 70 as to cause the valve means to operate prema
mentioned means at a relatively slow rate, valve
turely to interrupt said supply.
means operative to supply ñuid under pressure
10. In a ñuid pressure brake system compris
from said one passage to the íirst mentioned
ing a plurality of ñuid pressure reservoirs inter
means to effect the operation to close said valve
connected by means of a common conduit in
and operative in responsive to a certain degree 75 which system it is `desired to maintain fluid in
¿comme
11
lI2
one reservoir at pressures above a »chosen degree,
passage psf-*passing ‘said ‘valve throughfwhieh
aprotection valve device interposed vbetween said
iluid under pressure may ñow vfrom ¿said other
one reservoir and 4said conduit -comprising ya cas
passage to said one passage. ' ' '
ing having two connected passages one of which
is connected to said one reservoir and the other
to said conduit, a valve operative to one position
to close the connection between said passages
and operative to another position to open the
connection between said passages, va movable
11. In a fluid vpressure brake system ¿compris
ing »a plurality of 'fluid pressure main reservoirs
interconnected by means of la Vcommon conduit
in which system it 'is desired `to maintain Yiiuid
in‘one reservoir at pressures Within a chosen
range, a vprotection valve dev-ice interposed ¿be
tween said reservoir Íand said »conduit 'comprising
a casing having one ‘passage 'open to said conduit
and «another passage open to »said one reservoir,
a valve controlling communication between »fs‘aid
passages, piston means lconnected vto said ‘valve
and 'operative .to `one-position to close "said fva'lv-e
in response toa constant supply of fluid at a
pressure above a certain chosen degree and op
erative to another'position upon the ‘interrup-`
tion of said »supply to 'open »said Valve, and valve
member responsive to fluid' pressure Vfor operating
said valve to -close said connection and respon
sive to »a reduction in theiîuid pressure for oper
ati-ng said valve to open said connection, means
for reducing the vfluid pressure acting on the
movable member at -a »relatively slow rate, valve
means responsive to varia-tions in the pressure of
fluid lin said one «passage to control the supply
of fluid under pressure from V'said one passage to
sa'id movable member and 4thereby the fluid pres
sure 'acting on said movable'member, «said valve
means open ïfor supplying fluid'under pressure
from said one reservoir to said piston means, said
means being operative in »response to 'a -certain
`degree »of lfluid pressure to supply >ñuid under
pressure «to-said movable lmember to »effect the
operation of Vsaid valve yto close said connection
and lbeing conditioned -as an incident to »the con
nection clos-ing operation »of'said >valve to be op
valve means being -conditîonable by said piston
means when in vsaid yone position to respond to
an increase in ñuid pressure 'to a, predetermined 25 degree above said chosen degree to ‘close said
erative at -a ïdegree?of ñuid pressure higher than
said V`certain degree to interrupt the supply 'of
ñuid under pressure from said 4one -passage vto
said movable member, `-and >a unidirectional -ñow 30
communication and to respond ‘to a decrease -in
" fluid pressure to a certain predetermined >lower
degree tovopen said communicat-ion.
¿GLENN T.
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