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Патент USA US2404122

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July 16» 1946~
`
R. B. CAMPBELL
2,404,122 . v '
PIsToN BRAKE vVALVE
Filed Maron sò, 194s
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July 16; 1946.
R. B. CAMPBELL
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2,404,122
PIsToN BRAKE VALVE `
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2,404,122
Patented July 16, l1946
UNITED STATES PATEm` .QFFICE
2,404,122 '
PIs'roN BRAKE VALVE
Rodney B. Campbell, Van Nuys, Calif. l
Application March 30,1943, serial No. 481,078
9 Claims.
,
(C1. l30s-_54)
2
1
This invention primarily relates to a fluid brak
ing system, and more particularly to such a sys
tem having particular utility in the aircraft in
dustry, and therefore will be described in connec
tion therewith. Certain parts and combinations
of my system, however, are readily susceptible to
other uses, and I do not intend to be limited to
the preferred embodiment described.
Y
sure thereon and maintain it at an adjusted pre
determined maximum.
'
Another object of my invention is to provide
a fluid operated braking system including a-valve
device, in which the operation of> the actuating
or control mechanism, normally manually oper,
ated, is not critical to maintain'a predetermined
braking pressure applied by the operating fluid.
Another object‘of my invention is Ítopro'vide
Aircraft, and particularly aircraft of the large,
heavy transport type, are commonly equipped l0 a valve device'as described above in which the
with fluid operated brake systems, in which an
main valve is fully balanced hydraulically and
in which the exhaust valve is designed to open
automatically upon any slight abnormal Vrise in
the pressure of the fluid delivered to the brakes.
able conduits and a valve device to the liuid oper
ated brakes of the vehicle. Valve means are 15 While valves of the general type of my valve
are in wide use in the aircraft industry, by my
normally provided in the line of the conduits for
specific construction and arrangement-of parts
opening the conduits and permitting the oper
ating fluid to flow to the brake mechanism to
I have provided a valve which is more positive in
operation and more delicate in its response char
operate the same, and the normal-operating pres
sure of the operating fluid is commonly held below 20 acteristics than the prior art valves of which I
two hundred pounds per square inch. In normal
have knowledge, and my 'specific construction is
operating fluid, such as oil, is transmitted from
a source of supply such as a pump through suit
consequently of major importance.
.
Y
. Y
operation of such prior art systems it has been
Other objects and advantages will become evi,-V
discovered, however, that when the brakes are
dent in the following specification and inthe
applied to stop the travel of a heavy vehicle, such
~ Y
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as an airplane, a large amount of friction is 25 drawings, in which: . »
developed in the operation, which dissipates in
Fig. 1 is a ‘longitudinal vertical sectional view
taken through ,my valve, showing the valve in idle
the form of heat into the brake mechanism.
position.
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Í
Consequently, the column of operating fluid used
Fig. 2 is an end View of the right-hand end> o
to actuate the braking mechanism also absorbs
a considerable amount of this frictional heat, 30 the valve as shown in Fig. 1.V
which immediately expands the fluid, causing a
Fig. 3 is a view similar to Fig.v l, but showing
large increase in the pressure thereof. This pres
the parts in a first >operating position ¿in which
sure increase may quickly raise the pressure of
high pressure fluid is being supplied through the
the operating fluid from the normal Working
valve.
.
pressure of, for example, 200 pounds per square 35
Fig. 4 is a view similar to Fig. 3, but shows, the
inch, to an abnormally high pressure, sometimes
parts in a second -operating position in which high
attaining2000 pounds per square inch or more.
pressure'has built up within the valve to open
This abnormal rise in pressure of the operating
the auxiliary exhaust valve to permit the pressure
fluid has a number of disadvantages. For exam
to drop.
~
ple, it creates an abnormal and dangerous pres, 40 Fig. 5 is a cross-sectional view taken on the line
sure strain on the hydraulic equipment. Further
5-5 of Fig. l.
¿
Y .
.
more, and what is more serious, the increase in
Fig. 6 is a cross-sectional vie‘w'taken on the line
pressure increases the braking action, tending to
6--6 of Fíg- 1~
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lock the brakes of the airplane, which may oper-4
Referring to the drawings, I show a housing Ill
45
ate unevenly between the several brakes, caus
having a main bore II, a portion I2 of which is
ing serious accidents with their attendant loss of
of
slightly reduced diameter to provide an annu
property and life.
lar
shoulder I3 therebetween.> The housing `Ill is
It is therefore a primary object of my invention
provided with a suitably threaded inlet port I4
to provide an improved brake valve for aircraft
and other vehicles in which the pressure of the 50 which is adapted to receive the end of a pipe yor
tubing> I5 leading from a suitable source of high
operating fluid delivered to the braking mecha
pressure fluid (not shown) ., The large end of the
nism of the vehicle is at» all times automatically
-main bore I I is counterbored at Il and preferably
maintained at an adjusted predetermined maxi
mum.
-
It is a further object of my invention to pro- , 55
vide a novel valve device which will accomplish
the foregoing object, and which includes a main
valve and an auxiliary valve, the latter being
automatically operable in response to a rise in
provided with straight threads I8v which receive
a pipe fitting I9 having a suitably threaded sup~
kply port 20' thereinîadapted to receiveY the end
of a tubing 2| adaptedrto convey high pressure
fluid from the inlet port`l4 to a set of Yhydraulic
brakes or the like (not shown). The pipe fitting
_pressure of the operating fluid to relieve the pres 60 I9 is provided withran annular doughnut «packs
2,404,122
the end of the housing I 0, a fluid-tight seal being
provided therebetween by means of an annular
packing ring 53. The inner open end of the cylin
drical Vactuating member 5I is provided with an
ing ring 22 adapted to form a fluid-tight seal be
` Y tween the pipe litting and the mainbore Il.
y
A 'I'he pipe fitting I9 engages and holds in place
against the annular shoulder 1» I3 „a-tubular valve .
annular. iiange 55 which is engaged by a com
pression sprin'g 55 disposed in the annular space
. I4. The valve sleeve member' 24 is also provided!v ¿ ¿.413 ' and also engaging against the end of the valve
sleeve member 211 whichis provided with an» an-`
‘ Y nularfrecess 25 which registers with the inlet port`
’ with suitable annular packing rings 26 capable Qi _,
sleeve member 24.
‘ able belt BI, as best shown in Fig. 2. VThe split
The valve sleeve member 24 is
collar 5S is provided with ears B3 and 64 between
»provided with a minor bore 21 and a major bore"-Vr
28 oi' somewhat larger diameter, the valve sleeve,Iv y
member being of reduced external diameter con-v
centric with the major bore l28 to provide a re~
which .an actuating lever 65 is positioned, the ac- f'
tuating Vlever being pivoted on a pivot bolt 62.
The upper end of the actuating lever 65 is suitably
'connected to a brake pedalfor other actuating
mechanism adapted to rotate the actuating lever
iiß‘about the pivot VF2. The lower end ofA the a'c
tuating ylevert?, is provided with a yoke 66 in
which an anti-friction roller 6,1 is rotatably
mounted on Aa cross pin 68. As illustrated in Fig.
1; the anti-friction roller 61 vis adapted to engage
the end wall> 50--o'f the cylindrical actuating mem
duced 'annular portion 2Q. A Communicating be»
tweenrthe annular recess 25 `and the minor bore`
21Áare ,aj plurality of Ycrircurnferentially spaced
` radialjmainvalve'ports 3l, land communicating
through the V'reduced annular portion 29 of the
` î.valve ,sleeve area pluralityïof Vcirc_umferentially
spaced auxiliary ports 32. Y'
i ' Disposedrin theY minor :bore 21> of thesleev'el
‘_ member 24 is a tubular main valve member 33
adapted for axial movement in the minor bore
andl ground `for a close sliding iit therein Vand
provided with an annular doughnut packing ring
-
collar member 58 secured to the end 51 by a suit
member> and the bore Il on each side of the an-`
' nular recess 25.
.
Secured to an end 51 of the housing Iâ is a split
forming duid-tight seals between the valve sleeve
et
As
-be understood, ininstalling my device in
a hydraulic system, the high pressure tubing >I5
3S. .Thev main valve member 33 is provided at`
is .preferably connected to a high pressure pump
or‘other source of >high pressure?luid (not shown)
I its outer end V‘with an annular head 34 of slightly K _
greater diameter than the 'mino-r bore 21, theV 30
adapted to supply operating ñuid under a rela
tively high pressure such as, for example, 1000
head-'being provided with an inwardly bevelled Y. pounds per 'square inch, vto the valve device. The
supply tubing 2| is preferably connected to a hy
seating vface 35 which terminates on its inward
draulic brake or brakes (not shown) adapted to
end in Yan annular groove 36 formed on the pe
be actuated by the operating ñuiddeïliveredby the
l `
Engaging ì
riphery of the mainv valve member.
between the kannular head 35 and the pipe fitting ' inlet tubing I5 but at aY substantially lower fluid
pressure, and the exhaust pipe 45 is preferably
>Iii is- a relatively weak compression spring 3l
connected to a llow pressure discharge or the fluid
reservoir adapted to supply iiuid to the high pres
sure sourceV (not shown). Although my valve
adapted normally to urge the main valve member
l
to its seated position on the valve sleeve member, l
1 y as shown in Fig. l.
As willbe noted, when the
main, valve member 33 is ‘in seated position 46 device is particularly designed -for supplyingV op
erating fluid t0 a hydraulic brake system, it will
against the valve sleeve member 24, Vas shown in‘
be apparent that the valve device may be used in
Fig. l, the inner lendr39 of the main valve mem
otherfconnections without departing from' the
ber extends a substantial distance into the Vmajor
bore 28.
Y
'spirit Vof my invention.
f
Disposed in the ma-j'orb-ore '28 of the. ,valve€`
' In» operation, when my valve device is 'not be
ing >actuated to 'supply high pressure »operating
sleeveY member 2d for axial movement therein is
a cup-shaped auxiliary valve member 4B of some- 'Y
what greater external diameter than that ofthe
i
‘ñuid to »the hydraulic brake system, the parts 4are
lnormally'in the idle position illustrated by Fig. 1.
In Lthis position, the actuating lever 65 is in its
main y valve member 33. „ The auxiliary valve `/
member 4B has a central cavity 4I and is provided '
released position, permitting the cylindrical a-c
tuating member 5I to be moved into its rightward
` Yat'ìts open end with a conical seating face i2
adapted to telescope over and seat Aagainst the
inner end 39 of the main valve member 33, as
shown in Fig. 3. As will be noted from Fig. l, , .
when the cup-shaped auxiliary valve member »4B 55
is in the position shown therein andouto'fven
gagement with the main valve member 33, »fluid
communication' is provided between the supply
port 2i), through the interior of the main valve
member 33, and through the auxiliary valve ports 60
32 with an annular space 443 `formed between the
reduced annular portion 29er the valve sleeve
member 24 and the portion I2 of the main bore
I I, which in turn communicates with an exhaust y
position by the compression spring 5E, so that
the annular ñange 155 seats against the housing I 0.
In this position, the actuating spring 49 is fully
expanded, thus 'permitting the auxiliary valve
member-ll!! to Iremain in its open-position as shown
in
1„'in which fluid communication is pro
vided between the supply por-t 2i? and «theexhaust
port @E »through-'the -'bore of ¿the main valve mem
ber 33, -the auxiliary valve port-32, and the annu
’ larv space d'3. Thus, in this idle position the hy
draulic brake system is directlyv connected to
low'p-ressure exhaust so -that no fluid pressure is
on the vbrakes normally.
I
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When it is desired -»to supp-1y operati-ng fluid un
port "4.4 which is suitably threaded to 'receive an
exhaust pipe 45 adapted to communicate with a
der ‘pressure from the inlet tubing `I 5 to the sup
suitable point of low'pressure discharge Vor Vex-_v
ply tubing `2 l, the'actuating lever S5 is rotated in
'a clockwise direction toward the position illus
The closed end of >the auxiliary valve member _. trated in Fig. 3, which rotation operates through
4B is provided with a central boss 41 which regise 70 >engagement of the roller ¿61 with the end wall 50
ters with a spring follower element 43 which in
>o_f'lthe cylindrical»actuatingrmember 5I to move `
turn is engaged byY an actuating spring '49. The
the actuating mem-ber to the -left toward the po
other end of the actuating spring 49 engages the
sition ‘illustrated in Fig. 3. Leftward movement
end wall 50 of a cylindrical actuating member '5 I
of the actuating member 5I compresses the com
journalled in a cylindrical opening 52 formed in
V"pression spring 56. ïSuch `leftwa'rd movement also ,
haust (not shown) .
5
bodily moves'the actuating spring 49 to the left,
position illustrated in Fig. 3, it maintains the aux
moving with it the cup-shaped auxiliary valve
member 49, until the conical seating face 42
iliary valve member 40 in;pressure engagement '
thereof seats on the inner end 390i’ the main valve
member 33. Continued leftward movement of the
auxiliary valve member 40» then moves the main
valve member 33 to the left toward the position
shown in Fig, 3, in which communication is vpro
with the end 39 of «the main valve member 33,
the "pressure of engagement depending upon the
amount of compression of the actuating spring
49. Thus, the actuating spring 49 may be pref
erably designed to hold the auxiliary valve mem
ber lll)v in engagement with the main valve mem
ber 33 when in the maximum open position shown
vided between the inlet port I4 and the supply
port 29, through the annular recess «25, the main 10 in Fig. -3 until the ñuid pressure in the supply port
20 rises .to a value of, for example, 2.10 pounds
valve ports 31,' and the annular groove 36. It is
per square inch, at which time this pressure over
to be noted that when the main valve member 33
balances the action of the actuating spring 49
is in its closed position as shown in Fig. 1, high
>and forcesthe auxiliary valve member 40 to the
pressure fluid from the inlet tubing I5 fills the
right to the position illustrated in Fig. 4, thus
annularv groove 36, but since the ends of the an
further compressing the actuating spring.
nular groove are equal in cross-sectional area,
Upon rightward movement of the auxiliary
the main valve member is hydraulically balanced
valve member 40, the main valve member 33 also
as to such high pressure fluid. Consequently,
moves to the right in response to the action of
it requires little force exerted through the auxil
iary valve member 40'to move the main valve 20 the compression spring 31 bearing thereon, so
that the inwardly bevelled seating face 35 of the
member 33 from the closed position shown in
main
valve member seats on Ithe end of the valve
Fig. 1 toward the open position shown in Fig. 3.
>sleeve member 24 i-n its closed position, as illus
It is to be noted, however, that the compression
trated kin Fig. 4, before the auxiliary valve mem
spring 3l resists leftward movement of the main
ber 40 moves out of engagement with the main
valve member 33, and that as the spring Slis
valve Vmember 33. Thus, upon such a pressure
compressed by such leftward movement its re
rise in the supply port 20, the main valve mem~
sistance to the movement increases. Conse
ber 33 first closes communication between the
quently, the actuating spring 49 lis also/increas
inlet
port I4. and the supply port 20, and Áthen
ingiy compressed as the actuating lever 65 is ro
continues the movement of the auxiliary‘valve
tated from its released position shown in Fig. 1 30 member
4u to the right to the position shown in
to its open position shownin Figs. 3 and 4, in
Fig.
4
to
open
communication between the supply
which it applies a predetermined maximum fluid
port 20.and the exhaust port 44. Operating fluid
pressure to the brakes, such as, for example,'200
is then allowed to bleed from the supply tubing
pounds per square inch. Thus, the main valve
îlädirectly into the exhaust pipe 45 to reduce
member 33 may be moved by the actuating lever
the iiuid pressure in the supply tubing. , This
85 to any degree of opening between its closed
pressure drop continues until the ñuid pressure
position shown in Fig. 1 and its open position
in the supply tubing 2 i and supply port 20 drops
shown in Fig. 3. If'the main valve member 33 is
lto thev value for which the actuating springY 49
moved to its open position shown in Fig. 3, ob
is compressed by the setting of the actuatingA lever
viously the full fluid `pressure for which the actu 40 y65, such as, for example, 200 pounds per square Y
ating spring 49 isV designed (for example, _200
pounds per square inch) will be applied -to the
hydraulic brakes through the 'supply tubing 2l.
The main valve member 33 acts as a pressure re
inch, at whichtime the actuating spring 49 again
moves the auxiliary valve member 40 to its closed
position .in engagement with the main valve
member 33 to again move the main valve member
ducing device to reduce the fluid pressure applied 45 back to Ithe openv position illustrated in `Fig.,3.
to the brakes, the pressure reduction depending
Obviously, the main valve member 33 will not be
upon the degree of opening of the Valve. It will
opened in this manner until the fluid pressure
therefore be clear that the amount of'fluid pres
in the supply port 29 drops below the pressure
sure applied to the brakes depends upon the
for which the actuating sprl-ng 49 is set by the
50
rdegree to which the main valve 33 is opened, and
actuating Vlever 65, and thus there is no flutter
that the operator may apply any desired fluid
ing or' chattering of the main valve member on
pressure on the brakes up to the maximum pres
its seat. It will thus be understood -that with
sure for which the spring 49 is designed by sim
the actuating lever 65 moved to the position
ply controlling the amount of rotation of the
shown in Figs. 3 and 4, a predetermined fluid
55 pressure will be supplied to and held in the sup
actuating lever 65.
So long as itis desired to apply a predetermined
ply tubing 2l, and that any rise in fluid pressure
fluid pressure to the hydraulic brakes, the actu
inthe supply tubing 2| will cause the main valve
ating lever 65 is retained in its operating posi
member 33 to move to closed position, as illustrat
tion, such las shown in Fig. 3, .thus maintaining
ed in Fig. 4, and the auxiliary valve member 40 to
the main valve member 33 in its open position .60 move to open position to permit a reduction in
as shown therein. The device is designed so that
pressure. A'I'his action is entirely automatic, and
the main valve member remains in its set open
due to the simplicity of the parts and construc
' position so long as the fluid pressure in the sup
tion is adapted for and capable of holding the
ply port 23 remains below a predetermined de
fluid pressure in the supply tubing 2l within very
sired maximum. Upon a rise in ñuid pressure in 65 narrow limits of, for example, 5 to 10 pounds per
the supply port 20, which may be caused, for ex
square inch. Furthermore, the specific design
ample, by expansion of the operating fluid in the
of the parts and construction prevents chattering
supply tubing 2| due to heat generated by the
frictional application of the hydraulic brake, this
rise in pressure is communicated through the., 70
bore of the main valve member 33. to the interior
of the auxiliary valve member 40, tending to move
the latter to the right against the compression
_of- the actuating spring 49.` The actuating spring
¿49.»is ldesigned so that, when >compressed in the
of the valve members, which has been a source
of much difficulty in such valve devices hereto
fore. It will also be evident that if the actuating
lever 65 is rotated in a clockwise direction beyond
the position shown in Figs. 3 and 4, .the main valve
member 33 will be additionally moved to the leftto furtheropen communication between the an
.nular groove 36 and the supply port 20, thus tend
'2404,122
ing toîincrease the'Afluid"pressurev supply tothe
supply tubing 2l. VAs soon ‘as such pressure rise `
overbalances the compressive force exerted lbyv
`the lactuating -spring 49, however, theY 4’auxiliary
valve member 4i] will openas described above to
bleed off'this excess pressure. v"I‘l'rus„ it is 'impos
'diameter than said bore and having a rvpassage
»therein,`"sai-d main >valve member being axially
movable Vin said bore from a closed position in
which communication between said inlet port
and' said Ysupply port 'through said passage is
`sible for the operator `to apply a substantially
closed by said head seating against a shoulder
formed at one end ci said bore to an open posi
higher fluid 'pressure to the hydraulic »brakes than
that vfor which the Vactuating spring i9 is de-l
signed; which is an important safety `factor lin
tion inwhich said passage provides fluid com
munication between said inlet port and said sup- .
the device.
1
l
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ply port; means foryieldably maintaining said
main valve member in said closed position; a cup
~
VAs «will be understood, upon the .return of Athe
actuating 'lever to released position, 4as shown in
Fig. l, the main valve member '33 under faction
shaped auxiliary valve ’member axially movable
relative to said main valveV member and having
Van inwardly bevelled seating face on an open end
of the compression spring ¿31 willirclose as ïillu’s-` , `thereof adapted to seat `onY the periphery o'í one
trated therein, andthe auxiliary valve _member
40 will move to its open po's'ition‘as alsoVV illustra-t
ed therein.
‘
` '
end of said main valve member; a movable actu
ating member axially movable in said housing;
' spring Ämeans operatively connecting said actuat
`
' It will also be understood 'from the foregoing;
ing member and said auxiliary valve member so
~ desoription that any-desired'iluidl pressure mayl 20 that said auxiliary valve member may remain
be supplied »to the supply tubing 2l, vup to the.
out o'f engagement with said main valve member
‘predetermined maximum pressurev for ‘which the ‘
actuating spring t9 isdesigned. Thus, if the l
actuating spring £9 is designed to permit> a max~
`im-urn pressure application »of 200 pounds Yper
square inch, by only partial rotation of the actu
ating lever'tâ the operator may'apply any desired '
lower fluid'pressure to the brakes, such as, for-ex
ample, v50 pounds per square inch. ` Se long as
to provide »fluid communication between said sup»
»pl-y port and said exhaust port through said main
valve member; means for moving said actuating
member axially fromïa.` first position to oper-ate
through said spring means ñrs'tto `cause said aux
iliary valve lmember ‘to engage said main valve
'member so that said seating
seats on said .
periphery to close said fluid communication be-V
the Aactua-ting lever 65 _is maintained in such in 130 tween said supply?portY and said exhaust port,
3 Ytermediate position, Y.the lower pressure of -50 i
- and upon 'continued axial movement of said actu-v
i
pounds per square inch will be held cin-the brakes ‘
r'bl'acause'if the supplied pressure 'tends to rise, the
‘
ating member then to ïrnove said `main valve
member from said closed positionl to saidv 'open `
auxiliary valve will openjand allow the excess I
position; and means lor normally urging said
to bleed of? through 'the exhaust port 44,'and if ;.: actuating member to said first position.
Vthe supplied pressure tends Vto drop, the actuat-V
2. -In a valve device, the vcombination of : a
ï Ving, spring 49 vwill slightly open the main valve
housing having a bore therein and having an inlet
port, a supply port, Yand an exhaust port; a tubu
Í, Yup’tOi the desired application. IThus, the device
lar valve sleeve stationarily disposed in saidv bore
l will operate in substantially the same manner're 40 and having a lminor bore and a major bore axi
gar‘dless ofthe degree to which the main valve
ally aligned therein, said valve sleeve having a
3, memberrSS to permit the pressure to again build i
` >member is opened bythe operator.
My valve device is very sensitive to changes in
fluid pressure in the supply tubing ,2| and -oper
ates to hold a desired predetermined fluid pres'- 21. .
sure in the supply tubing within very close limits,
which has not been possible with the prior art
devices of which I have knowledge. This `supe
Yrior functioning is due in large part to the facty '
main ¿valve port communicating between said
minor bore and said inlet port, and having an
auxiliary valve port communicating between said
'major bore and said exhaust port; a tubular main
valve mem-ber in said Íminor bore having a pas
, Vvsage therein, said main valve member being axi
ally movable in said minor bore from a closed po
sition in which communicationx between said
that the 'main valve member 33 ,is substantially Ii() main valve port and Said supply port through
l hydraulically balanced when closed, its end 439
Ysaidpassage is closed to an ope-n position-in
` being of substantially the same area as its .other ‘
which said passage provides fluid communication
end, and in combination therewith the area of
between> said main valve port and saidpsup-plyY
` theauxiliary valve member 40 exposed to the }
port; abuis-shaped auxiliary valve member in
ï fluid pressure of «the supply port 2i) is as large .as . said maior bore and axially movable relative to
‘n possible# This latter feature is achieved by -tel-e
` scoping the auxiliary valve member 4l! over the
Vsaid main valve member, said auxiliary valve
member normally being out of engagement with
end 39 of the main-valve member 33, a self-cen
said main valve member so that huid communica
1 tering seating thereof being attained bythe coni
tion is provided between said auxiliary valve port
i cal seating face 42 whichv compensates for any 60 and said supply port through said main valve
` possible slight axial misalignment of the valve
member; an actuating member in said housing;
spring means operatively connecting said actuat
Although I have shown and described a pre
ing member and said auxiliary valve member;
§ ferred embodiment of my invention which has
and means for moving said actuating member -to
members.
'
'
l particular >application ~to hydraulic brake sys- f '
cause said spring means iirst to move said aux-V
" tems for aircraft, it will be appreciated that .I
do not intend to be limited to such a construc
iliary valve member, into engagement with said
\ tion, butpdesire to be'aiforded the full'scope of
` the following claims.
'
I claimV as my invention:
y
l. In a valve device,r the combination of : a
l housingv having an‘inlet port, a supply port, an
main valve member to close Huid communication
between said auxiliary valve port and said supply
port, and then to move said auxiliary valve mem
ber and said main valve member to move said
`main valve member from `said closed position to
said open position,
f
`¿ exhaustpcrt, and a valve bore; a tubular' main
n
In a valve device, the combination of:V a
î'valve member in said 4bore having an annular
housing having a vbore therein and having an in
1 >'headon one end thereof> of `only* slightly larger 75 let port, a supply port,> and van exhaust port; a
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tubular valve sleeve stationarily4 disposed in said
member to move said main valve member from
bore and having a minor bore anda major bore
said closed position to said >open position.
axially aligned therein, said valve sleeve' having
5. In a valve device, the combination of : a
a main valve port communicating between said
minor bore and said inlet port, and having an
housing having a bore therein and having an in
letport, a supply port, and an exhaust` port; a
tubular valve sleeve in said bore engaging a shoul
der formed in said bore and having a minor bore
auxiliary valve port communicating between said
major bore and said exhaust port; a tubular main
valve member in said minor bore having a pas
sage therein and having an annular head on one
and a major bore axially aligned thereirnsaid
valve sleeve having a main valve port communi
end thereof of only slightly larger diameter than l0. eating between said minor bore and said >inlet
said minor bore, said main valve member being
port,` and havingan auxiliaryvalve port commu-'
axially movable in said minor bore from a closed
nicating between‘said major bore andsaid ex-4
position in which communication between said
haust port; sealing means-adapted to formla
main valve port and said supply port through said
duid-tight joint between said` valve sleeve and'
passage is closed by said head seating against 15 said bore; a fitting threaded into one'endof said».
one end of said valve sleeve to an open position
housing and engaging said valve sleeve to hold
in which said passage provides fluid communi
the same rigidly in 'said housing; a tubular main
cation between said main valve port and said
valve member in-said minor bore having a pas-1
supply port; a cup-shaped auxiliary valve mem
sage therein, said >main valvemember` being ax
ber in said major bore and axially movable rela-' 20 iallyfl movable in said niinorbore from a closedv
tive to said main valve member, said auxiliary
positionin which communication ,between-said
valve member normally being out of engagement
main` valve port and said» supply port through said
with said main valve member so that fluid com
passage is closed'to an openV positionginwhich
munication is provided between said auxiliary
said'passage provides fluid 'communication be
valve port and said supply port through said main 25 tween said main valve port kand said supply portf
Valve member; an actuating member in said hous
ing; spring means operatively connecting said ac
tuating member and said auxiliary valve member;
and >means for moving said actuating member to
a cup-shaped auxiliary valve member' in'said
major bore Vand axially movable yrelative to said
main valve member, said auxiliary valve member
normally being out of engagement with said main
cause said spring means iirst to`move said aux
valve member so that fluid communication is pro
iliary valve member into engagement with said
vided between said auxiliary valve portand said
supply port through said4 main valve member; an
actuating member in’said housing; spring means
main valve member to close fluid communication`
between said’ auxiliary valve port and said supply
port, and then to move said auxiliary valve mem
operatively connecting said' actuating member
ber and said main valve member to move said 35 and said auxiliary valvefmember; and means> for
main valve member from said closed position to>
said open position.
4. In a valve device, the 'combination‘off 'a`>
housing having a bore therein and having an
inlet port, a supply port, and an exhaust port; a
tubular valve sleeve stationarily disposed in said
bore and having a minor bore and a major bore
moving said 'actuating member 'to-»cause saidf
spring means first to move said auxiliary valve'
member into engagement with said-mainuvalve
member to close fluid communication between
said auxiliary valve portand said supply port,l
and then to Hmove said auxiliary valve member
and said main `valve member to move said main
axially aligned therein, said valve sleeve having
valve member from said closed position to said
a main valve port communicating between said
open position.
minor bore and said inlet port, and having an
auxiliary valve port communicating between said
major bore and said exhaust port; a tubular main
.
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.6. In a valve device, the combination of:Y a
housing having a bore therein and having‘an in- ì
let port, a supply port, and an exhaust port; ‘a
valve member in said minor bore having a pas
tubular valve sleeve rigidly secured in said bore
and having a minor bore and a major bore ax
sage therein, said main valve member being ax
ially movable in said minor bore from a closed 50 ï ially‘aligned therein, said valvesleeve having a
position in which communication between said
»main valve port communicating between said mi»
main valve port and said supply port through
nor bore and an annular groove in the periphery»
said passage is closed to an open position in which
of said valve sleeve registering with said inlet
said passage provides fluid communication be
port, and having an auxiliary' valve port com»
tween said main valve port and said supply port; 55 »municating between said major bore and said
a cup-shaped auxiliary valve member in said ma;`
exhaust port; a tubular main valve member in
jor bore and axially movable relative to said main
said minor bore having an annular groove pas
sage formed on its periphery adapted to register
valve member, said auxiliary valve member hav
ing an inwardly bevelled annular seating face on
with said main valve port, said main valve mem
an open end thereof adapted to seat on the pe 00 ber ybeingl axiallyV movable in said> minor bore-`
from a closed position in which communication
riphery of one end of said main valve member,
said auxiliary valve member normally being out
of engagement with said main valve member so
that fluid communication is provided betweenA
said auxiliary valve port and said supply port
through said main valve member; an actuating
member in said housing; spring means operative
ly connecting said actuating member and said
' auxiliary valve member; and means for moving
said actuating member to cause said spring means
first to move said auxiliary valve member intol
engagementwith said main valve member to close
fluid communication between said auxiliary valve
port and said supply port, and then to move said
between said main valve port and said ysupply
port through said passage is closed to an open
position in which said passage provides fluid com
munication between said main valve port and
said supply port; a cup-shaped auxiliary valve
member in said major bore and axially movable
relative to said main valve member, said auxil-V
iary valve'member normally being out of engage'
ment‘with said main valve member so that fluid
communication is provided between said auxil
iaryi valve .port and said supply port through said
mainvalve member; an actuating member in'saidj
housing; spring means operatively connecting
auxiliary valve member and said main valve 75 said (actuating member and said auxiliary valve
2,404,122 Y
l2
anced lwhen said main valve member is in said
open position; an auxiliary valve member axially
movable, relative to said main valve member and
adapted to Vseat onone end of said main valve
.memberj and means vfor moving said actuating
‘member to cause said spring means ñrst 'to move
Isaid-` auxiliary valve member into engagement
ìwith ‘said mainr valve member to close fluid com- `
>member without changing substantially the area
ïmunicati'on rbetween said auxiliary valve port and
of said one end exposedv to the fluid pressure of
Vsaid supply port; a movable actuating -member
axially movable iny said housing; spring means
. lsaid supply port, and then toïmove saidV auxiliary
Ívalve member and said main valve member to
move said main valve member from said closed
operatively connecting said actuating member
l position to said open position.’
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10 and said auxiliary valve member so that said aux
. 7."In` a valveY device, the combination of: a
iliary valve member may remain out of engage
§housing' having a main bore therein and having
ment with said main valve» member to provide
`an inlet "port, asupply'port, `and an exhaust port;
la tubular valve 'sleeve in said main bore and hav-_
fluid communication between said supply port
and said exhaust port throughv said main valve
y Ylrthîerein, said valve sleeve having an annular 15 member; means for moving said actuating mem
ber axially from a iirst position toY operate
¿portion of reduced Vexternal diameter concentric
through said spring means first to cause said
lwith saidfmajorv bore toprovide an annular space
auxiliary Valve member to engage said one end
betweenv said annular portion and' said main bore
of said main valve member to close said iluid
¿communicating with said exhaust port; and hav
‘ing’ Va main valve port communicating between 20 communication between said supplyport and said
exhaust port, and upon continued axial move
said minor bore and said linl'etV port, and'having
ment of said actuating member then to move said
1an ’ auxiliaryV valve port communicating between
main. valve member from said ¿closed position to
lsaid »majorjbore 'and' said annular space; a tubu
said open position; and means disposed between
lar main valve member in said minor bore hav 25 said
housing and said actuating member for nor-`
ling a passage therein; said main valve'member
mally
urging said actuating'm'ember to saidñrst
¿being axially _movable in said minor bore from a
` closed' position in which communication between
ing’a minor bore and a major bore axially aligned
position.
.saidl passage _is 'closed to> an open position in
which 'said'passage provides fluid -communication
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» 9. In a Valve. device, the combination of: a
`said main'valve port and said supply port'through
housing having a major. bore,4 an intermediate
30 bore, and a minor bore therein in axial align-V
e `between said main valve port and said supply
`portïffa cup-shaped' 'auxiliary- valve member inr «
I said major bore andaxially A'movable relative to
said main'- valve member fr_om anopen position
»inwhich it is out of engagement with said main
Y VÍvvalve'rîneinberv to open fluid communication be'- Y ,
ment and having an inlet~ port, a supply port,
and an exhaust port; a tubular valve sleeve sta
.tionarily disposed in said major bore and having
a main bore and an auxiliary bore axially aligned
' therein, said valveY sleeve having a main valve
port communicating between saidÍ main bore and
saidinlet port and having an rauxiliary valve
`Ívtwïeeii said auxiliary valve port and said supply ` Yport
communicating _between said» auxiliary bore
`port throughsaid main Yvalve member to a closed ‘
said exhaust port; a tubular main valve
jp'osition, iniwhich git’ tengages saidv main valve I i YandV
member
in said main bore and having a passage
Y‘member to close such communicationjl an actu
therein; Vsaid main valve member' being axially
ating member in- said'housing and movable in
movable inrsaid main bore from a .closed position
the same direction as_said auxiliary valvemem
in Vwhich communication between said inlet> port
‘.ber’; a compression spring disposed in said an
.nular space and engaging between said valve
and~ said supply port through said main valve port
and said passage is closed to an open position in
*sleeveand/said actuating member to tend to urge 45 which
said passage and said main valve port pro
`saidactuating member away`v from said'auxiliary ` Y vide
fluid communication between >said. inlet port»
¿valve member to an inoperative position; an‘ .and said supply port; a» cup-shaped auxiliary
actuating spring disposed between said 'actuat
valve member in said auxiliary bore and axially
iing member and said auxiliary member and de
relative to said main valve member, said
;signed'so that? when saidactuating member is
to; movable
auxiliary valve member normally being out of en- ,
[said inoperative position 'said actuating spring ‘
gagement with said main valve member so that
fluid communication is provided between said
exhaust port and said supply portY through said
ltuating member against the action of said. com’-y
main valve member and said auxiliary valve port;
se
.lpression spring to apply -force to said auxiliary
an actuating member disposed in said minor bore;
valve member through said actuating spring lirst
exerts _substantially no force on said auxiliaryV
valve member;A and means for moving 'said ac
tomove said auxiliary valve member‘int'o said
lclosed lposition and then to move said'auxiliary
valve member and said main valvey member to
move the latter to its said 'open position.
Y
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8. In a valve device, the combination of: a
housing having an inlet port', a supply port, 1an " `
Iexhaustport,“and a valve bore; ya tubular main
spring means disposed between said actuating
member and said auxiliary valve member; means
for axially moving said actuating member to
cause said spring means ñrst to Ymove said aux
iliary valve member intov engagement with saidvr
main valve member to close fluid communication
between said exhaust port> and said supply port
` through said main valve member and said auxil
valve> member in said valve bore and having a .
iary valve port,- and Vthen'to move said auxiliaryV
65
V:passage therein, said main valve member being
Eaxially movable in said bore from a closed posi
valve member and said main valve member to
move said main valve member from said closed
. ¿tion'in which communication' between saijd inlet ` ` ' position tosaid open position; and spring means
`'port and said Ysupply port through said passage is
` closed ïtoan' open position in which saidgpassage "
¿.provideswiiuid 'communication between saidinlet
3 port and said supply port,'Y the ends of said'main
`valve member being exposed to the fluid pressure' '
îoiï‘fsaidï supply ,port and ibeing'hydraulically bal- _
disposed in said .intermediate bore for normally
maintaining said main valve member and said
auxiliary Valve member outof engagement. .r
i
RODNEY B. CAMPBELL.
y
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