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Патент USA US2404102

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July l@ v14%.
H. B; SCHULTZ
REGULATING VAIQVE
Filed DSC. 12, 1942
‘caw 92a
2, @45102
Patented July 16, 1946
2,404,102
UNITED STATES PATENT OFFICE
2,404,102
REGULATIN G VALVE
Harold B. schuim, south Bend, Ina., assigner to
Bendix Aviation Corporation, South Bend, Ind.,
a corporation of Delaware
1
Application December 12, 1942, Serial No. 468,763>
6 Claims. (Cl. 137-153)
This invention relates generally to iiuid pres
sure systems for aircraft, and particularly to im
provements in regulating or unloading valves de
signed to maintain a close range of pressures in
such systems.
Fluid pressure systems for aircraft generally
employ aV pump, which is connected by a power
takeoff from the engine, for placing fluid under
pressure which is stored in an accumulator.
Since it is ordinarily not practicable to disconnect
2
will not require close concentricity to be main
tained in the Working parts thereof, thereby de
creasing the cost of manufacture.
A still further object is to provide a regulator
or unloading valve which will have incorporated
therein means for preventing the flow of fluid in
a reverse direction through the valve.
Another object is to provide a novel valve con
struction which requires only a single casting to
serve as the valve body, and which will require a
minimum of Wear resistant/liners in the body
the pump from the engine when the desired upper
limit of pressure in the accumulator is reached,
thereof.
it is the practice to employ a valve in such a sys
Other desirable advantages and functions of
tem which will operate to unload pumped fluid
the regulator or unloading valve comprising this
back into a reservoir. Such valves are also oper ld invention will be apparent from a study of the
able to prevent unloading back to reservoir when
the pressure in the accumulator has fallen to
specification and drawing in which the single iig
ure shows a iiuid pressure system having therein
some selected value, at which time the pump will
the valve according to the present invention
pass fluid to the accumulator until the upper
shown in longitudinal section,
pressure limit is reached once more.
20
Referring now to the drawing, the fluid pres
The valves of the prior art have generally been
sure system shown comprises a reservoir I 0, a
open to the objection that they will not operate
pump I2 .connected through a regulator valve I3
at the desired pressure limits, i. e., they do not
to an accumulator I4 which is maintained at a
start the loading operation consistently at the
desired pressure value by means of the valve I3,
low Ipressure limit, nor do they start the unload-> 25 the operation of which will be described later.
ing operation consistently at high pressure limit.
The accumulator I4 may be connected to work
If the operating range of such valves cannot be
as shown, and the regulator valve I3 is connected
closely held, it is obvious that such systems will
back to the reservoir IU' by means of a conduit IB.
not be operated at optimum.
The regulator or unloading valve I3 comprises
Another objection open to the valves of the 30 a body I8 having a pumping or inlet port 20 .con
prior art lies in the fact that they are not ad
nected to the pump l2, a working port22 con
justable for pressure systems which are desired
nected to the accumulator I4, and a relief‘or
to be held at different pressure values. No de?l
reservoir port 24 connected to the conduit lr6
nite standard having been set in the industry for
which in turn passes'iluid back to the reservoir
the pressures to be employed in such systems, it `
I0 under conditions which will be later described.
is necessary to design each valve according to the
For passing pumped fluid from pumping port
pressure valves used, and it therefore is impos
29 to the Working or accumulator port 22 a .pas
sible to use the valves interchangeably with sys
sage 26 is provided which has Within it„at the
tems using diiîerent pressure values. n
intersection of the working port 22 and the pas
lit is therefore an object of this invention to "
provide a regulator or unloading valve for such
a fluid pressure system which will be operable at
`the desired limits of pressure.
Another object is to provide a valve of the type
mentioned which is adjustable, so that it will
sage 26, a check valve 28, which prevents the re
turn of fluid from the accumulator port 22 to
the pump l2. Check valve 28 is constantly urged
to the left by a coil spring 3D which abuts a cap
screw 32 threaded into the body I8, and is pro
vided With relief ports 34 to equalize with the ac
open at any desired predetermined high pressure,
and so that it can be made interchangeable in
cumulator any pressure behind it.
unloading period is kept to a minimum.
Within the liner 40 and is normally biased to the
left by a spring Sil'which abuts the hollow seat
'
A bore 35 intersects the relief port 24 and the
pressure systems employing diiïerent pressure
pumping port 2U, and is enlarged as at 38 to pro
values.
,
Vide for a wear resistant liner 40, which is held
Yet another object is to provide such a valve, 50 in position by a hollow seat member 42 and a
which when in the open position, will have very
threaded plug 44.
little resistance to fluid flow, so that the head
For preventing the flow of pumped fluid to the
against which the pump must operate during the
reservoir I0 a movable plunger 48 is provided
.
A still further object is to provide a valve which
2,404,102
3.
member 42. Means are p-rovided for the control
of the movements of the plunger 48 as regards its
position for unloading fluid to the reservoir or its
position for loading pumped fluid into the ac
cumulator 22, and includes a member 54 adapted
for movement with respect to the hollow plunger
48. Member 54 has a passage 56 therein, which
communicates with a bore 58, upon which ball
valve 60 is adapted to seat, and which communi
cates with the chamber formed .behind the hol
low plunger 48, the member 54, and the hollow
seat member 42. A piston member 62 slides in
the bore 58 and contacts the ball 68. A load is
maintained on ball 68 and its seat .by means of
4
the pumping port 28, out the relief port 24 and
into the reservoir I8.
When the demand for fluid on the accumulator
I4 causes the pressure within it to drop the valve
will travel to closed position as shown in the fig
ure, so that fluid under pressure can be passed
from the pump I2 to the accumulator I4 until
the desired upper limit of pressure is once more
attained. ' The sequence of operations taking
place in the valve I2 under such conditions is as
follows:
When the pressure in the accumulator I4 drops,
as has been explained, the spring 84 tends to
overcome the force on nrst the seat of Iball 14 and
the spring 84 which may be load adjusted by 15 then the smaller area of the piston member 18,
and the ball valve ED will then close. `With the
means of the adjusting screw 65 which is en
ball valve 14 open, fluid is free to pass from the
closed by an acorn nut 68 threaded to the body I8.
pumping port 2l! through the passages 89, 82, and
Adapted to contact the piston member 62 is a
84 into the chamber behind the hollow valve
second piston member 18 which is slidable in a
bore 12 in the hollow seat member 42, and Iwhich 20 plunger 48 and the member 54. A pressure dif
ferential is thus created across the plunger 48
contacts a second ball valve 14, whose seat is
and it will then seat as shown in the figure.
larger in effective area than the seat of ball valve
While the valve has been described with refer
68. Ball valve 14 at times may be seated, and is at
ence to a particular set of operating conditions,
all times urged to the left by a spring 16 which
abuts a keeper 18 which is staked into position 25 which includes operation below the upper limit
of pressure at which the valve unloads pumped
in the hollow seat member 42. A passage 8i! in
fluid back to the reservoir, and an operating range
the valve body I8, and a passage 82 in the hollow
as determined by the ball valves S8 and 14, it will
seat member 42 serves to transmit the pressure at
be apparent that the point at which unloading
and the pressure can at times be communicated 30 may begin and the range during which the un
loading operation obtains may easily be adjusted
to the chamber behind the hollow plunger 48 into
to for any desired set of operating conditions.
passages 56 and 58 by means of a passage 84.
` For example, t-o cause the Valve to unload at a
The operation of the valve just described is as
higher pressure value, it is only necessary to in
follows:
crease the load in spring 64 by means of the
Assuming no residual pressure in the system,
adjusting screw 86. To increase the range in
the position of the parts shown will be such that
the working port 22 to the seat for the ball ’54,
which the unloading operation takes place it is
the hollow plunger 48 will be seated as shown in
only necessary to increase the area of the seat of
the ñgure, since it is urged to the left by the
ball valve 14 with respect to the area of the seat
spring 58; and the member 54 will be urged to the
right to a position where it abuts the hollow Iseat 40 of ball valve 68. Conversely, it will only be neces
sary to decrease the area of the seat of ball valve
member 42, since member 54 is urged to the right
6l) with respect to the area of the seat of ball
by the load maintained in the spring 64 against
valve 14 to increase the range. Obviously the
the ball 6D. When the pump I2 begins to pass
increased or decreased difference in seat areas
fluid under pressure to the accumulator I4, a part
may be obtained by the 'selection of members 54
of the fluid is passed through the passages 88, 82,
and 42, which have with them seat areas accord
84 and into the chamber formed behind the hol
ing the particular range of desired pressures.
low plunger 48 into the passages 58 and 58 and
Obviously the eiïective area of piston member 10
the iluid also impinges against ball 68, which is
seated on member 54. The pressure continues 50 must be between the area of the two ball valve
seats.
~
to build up until the member 54 has moved to
It will also be obvious that the valve described
the position as shown in the single ñgure, and
has a minimum number of parts which require
will remain in that position until the upper de
concentricity to be held very closely to insure
sired limit of pressure in the accumulator I4 is
close ñts for minimizing leakage through the
attained.
55 valve. Thus to prevent the leaking of pumped
When the upper limit of pressure is reached the
iiuid through the valve into the reservoir, only
force against the seat of ball valve 80 is 'suiiicient
the plunger 48 must be held concentric with its
to unseat it against the force of spring 64,__ kAs
seat, the .ball valves 88 and 14 being adapted to
the ball Valve 68 unseats, the pressure behind it
seat readily regardless of the alignment of springs
is relieved, and as the pressure cannot be ad 60 84 and 16 and the piston members S2 and 18. The
mitted readily through the restricted passage 56.
only other member required to be held closely
the pressure acting on the right hand end of pis
concentrically is the check valve 28, and the im
ton member 10 through the passages 88 and 82
portance of close concentricity in the check valve
further unseats the ball 60 until the ball 14, which
28 is not relatively great.
is urged to the left by spring 16 is seated in the 65
While the invention has been described with
seat member 42. When the ball 14 is seated the
reference to a preferable embodiment thereof, it
load in spring 84 is opposed by the hydraulic
is not to be limited in any 'Wise by the embodiment
force against the seat of ball valve 14 and ball
shown, nor otherwise than by the terms of the
50 is thus held from itsseat. Once the ball 14
appended claims.
is seated the pressure behind the plunger 48 and
I claim:
the member 54 is relieved through the passages
1. A regulator valve which opens at an upper
55 and 58 and the plunger 48 with the member
limit to relieve pressure from a fluid pressure
54 moves to the right with this relief of pressure
system and which is closed ata lower limit com
against the hollow seat member 42, thereby per
prising a body having pumping, working and re
mitting fluid to pass from the pump I2, through 75. lief ports,` means establishing communication be
`2,404,105;
5
'tweenthe pumping and working ports, a bore
-intersecting the relief port and having a valve
seat disposed therein, means including said bore
yand Yvalve seat for establishing communication
between said pumping and relief ports, a pres
sure responsive normally spring-closed plunger
movable in said bore and constructed and ar
ranged to cooperate with said valve seat for clos
ing the relief port, said plunger being so con
stituted that its end adjacent the valve seat is
subjected tothe pressure at the pumping port
and -its other end is subjected to a variable pres
sure, control means for regulating said variable
>pressure comprising a member movable with re
spect to the plunger and having a restricted pas
'sa'ge therethrough» for dissipating fluid from said
other end of said'plunger and a first control valve
seat thereon, a first control valve biased to said
seat, conduit means establishing communica
tion between the working port and said other end
lof the plunger, said conduit means being pro
-vided with a second control valve seat, a second
control valve biased toward the second control
`-valve seat, the first control valve seat being of
'smaller cross-sectional area than the second con
trol valve seat, means intermediate and in con
'tact with both said control valves arranged so
`that but one of said control valves may be seated
Iat »a time,`the bias ‘for the first control valve
exceeding that ofthe second control valve, the
Yfirst control valve and intermediate means be
'in‘g’arranged so that said first control valve will
lbecome at least slightly unseated when the pres
sure transmitted from said working port exceeds
said upper limit to create adiiîerential in pres- '
sure on said intermediate means causing it to
completely unseat said first control valve and
vpermit the seating of said second control valve,
the unseating of said control valve being effec
tive to dissipate sufficient pressure from said
other end of the plunger to cause it to move to
pass fluid from the pumping port to the relief
'seated therefrom, means intermediate the'ñrst
and second control valves and arranged for un
seating the second control valve when the first
`control valve is seated and vice versa, the first
Acontrol valve being arranged so that it will be
come unseated when the pressure transmitted
from said working port exceeds said upper limit,
the arrangement being such that suñicient move
ment of the second control valve toward its seat
creates a differential in pressure on said second
control valve causing it to move towards its seat
to further unseat said ñrst control valve and to
seat said second control valve, the unseating of
said first control valve being effective to dis
sipate sufñcient pressure from said other end of
`the plunger to cause it to move to pass fluid from
the pumping port to the relief port.
3. A regulator valve which opens atan upper
limit to relieve pressure from a fluid pressure
system and which is closed at a lower limit com
prising a body having pumping, working and re
lief ports, means establishing communication be
tween the pumping and working poits, a bore
intersecting the relief port and having a valve
seat disposed therein, means including said bore
and valve seat for establishing communication
lbetween said pumping and relief ports, a pres
sure responsive normally spring-closed plunger
movable in said bore and constructed and ar
ranged to cooperate with said valve seat for clos
ing the relief port, said plunger being so consti
tuted that its end adjacent the valve seat is sub
jected to the pressure at the pumping port and
`its other end is subjected to a variable pressure,
control means for regulating said variable pres
sure comprising a member movable with respect
to the plunger and having a restricted passage
therethrough for dissipating fluid from said other
`end of said plunger and a first control Valve seat
thereon, a ñrst control valve spring biased to
said seat, conduit means establishing’communi
cation between the working port and said other
end of the plunger, said conduit means being
provided with a second control valve seat, a sec'
2. A regulator valve which opens at an upper 45 ond control valve spring biased toward the sec
limit to relieve pressure from a ñuid pressure
ond control valve seat, the ñrst control valve seat
system and which is closed at a lower limit corn
`being of smaller cross-sectional area than the sec
prising a body having pumping, working and re
ond control valve seat, means including. a plural
lief ports, means establishing communication be
ity of piston members coaxially arranged with
tween the pumping and working ports, a bore 50 -respect to each other and disposed intermediately
`intersecting the relief port and having a valve
and in contact 'with both said control valves
seat disposed therein, means including said bore
arranged so that but one of said control valves
and valve seat for establishing communication
may be seated at a time, the bias for the first con
between said pumping and relief ports, a pressure
trol valve exceeding that of the second control
Vresponsive normally spring-closed plunger mov 55 valve, the first control valve and intermediate
able in said bore and constructed and arranged to
means being arranged so that said first control
cooperate with said valve seat for closing the re
valve will be at least slightly unseated when the
lief port, said plunger being so constituted that
pressure transmitted from said working port ex
‘its end adjacent the valve seat is subjected to the
ceeds‘said upper limit to create a diiîerential in
pressure at the pumping port and its other end 60 pressure on said intermediate means causing it
is subjected to a variable pressure, control means t
-to completely unseat said first control valve and
port.
for regulating said variable pressure comprising
'a member movable with respect to the plunger
`permit the seating of said second control valve,
the unseating of said control valve being effec
tive to dissipate sufficient pressure from said
and having a restricted passage therethrough for
dissipating fluid from said other end of said 65 other end o'f the plunger to cause it to move to
plunger and a ñrst control valve seat thereon,
pass fiuid from the pumping port to the relief
a first control valve biased toward said seat and
port.
4. A regulator valve for a fluid pressure system
normally seated thereon, the first control valve
comprising a body having an inlet, working and
seat being of smaller cross-sectional area than
relief ports, means establishing communication
the second control valve seat, conduit means
between the inlet and working ports, a conduit
establishing communication between the working
interconnecting theV inlet and relief ports, a
port and said other end of the plunger,`said con
plunger disposed in the conduit constructed and
duit means being provided with a second control
arranged to control communication between the
valve seat, a second control valve biased toward
inlet and relief ports, said plunger being nor
the second control valve seat and normally un
2,404,102
,7
`
l.ma‘lly spring ‘biased to cut off communication be
unseated, the first valve seat being of smaller
cross-sectional area than the second valve seat,
a pair of piston members coaxially arranged in
tween the inlet and relief ports and so consti
tuted to respond to the inlet port pressure acting
on one end for moving said plunger in a direc
tion to establish communication between the in
jlet and relief ports and to respond to working
termediate the ñrst and second valves and con
structed and arranged so that one only of said
port pressure acting on the other end for mov
ing said plunger in a direction toy cut 01T com
first valve being greater than the force urging f
valves is seated at a time, the force seating the
the second Valve toward its seat, said ñrst valve
munication between said inlet and relief ports,
means for controlling the working port pressure 10 being arranged to unseat in response to the work
ing port pressure above a predetermined value,
acting on said other end of the plunger compris
the
arrangement being such that suiîìcient move
ing a first valve carried by the plunger and nor
ment of the second control valve toward its seat
mally spring seated, a passageway communicating
creates a differential in pressure on said second
the ñrst valve and said other end of the plunger
with the working port pressure, a second valve 15 valve to seat it in said passageway, the unseat
ing of said ñrst valve being effective to dissipate
,insaid passageway urged toward its seat and nor
the working port pressure acting on said member
mally unseated to permit the working port pres
and said other end of the plunger to cause them
sure to act on said other end of the plunger
to move in a direction to establish communication
and on said ñrst valve, the first valve seat being
between the inlet and relief ports.
~
of smaller cross-sectional area than the second 20
valve seat, means disposed between the valves
.and so arranged that one only of said valves is
6. A regulator valve for a ñuid pressure system
comprising a body having inlet, working and relief
ports, means establishing communication between
the inlet and working ports, a conduit intercon
necting the inlet and relief ports, a plunger dis
seated at a time, the force seating the first valve
being greater than the force urging the second
valve toward its seat, said ñrst valve being ar 25
posed in the conduit and constructed and ar
ranged to unseat in response to the working port
ranged to control communication between the
pressure above a predetermined value, the ar
inlet and relief ports, said plunger being so con
rangement being such that sufficient movement
stituted that one of its ends is subject to inlet
.of the second control valve toward its seat creates
pressure tending to move the plunger to estab
a differential in pressure on said second valve to 30
lish communication between the inlet port and
.seat it in said passageway, the unseating of said
relief port and its other end is subject to work
Iirst valve being eifective to dissipate the work
ing port pressure tending to movey the plunger
ing port pressure acting on said other end of the
to cut 01T communication between the inlet port
plunger to cause it to move to establish com
and
relief port, means for regulating said work
munication between the inlet port and relief 35 ing port
pressure acting on said other end of the
port.
plungerv and comprising a iirst valve carried by
« 5. A regulator valve for a iluid pressure system
the plunger and normally spring seated, a pas
comprising a body having inlet, working and re
sageway
establishing communication between the
lief ports, means establishing communication be
tween the inlet and working ports, a conduit 40 first valve and said other end of the plunger
with the working port, a second valve in said
interconnecting the inlet and relief ports, a
passageway
urged toward its seat and normally
plunger disposed in the conduit constructed and
unseated, means disposed between the valves and
arranged to control communication between the
so arranged that one only of said valves is seated
inlet and relief ports, said plunger being nor
a time, the force seating the first valve being
mally spring biased to cut olf communication .45 `at
greater
than the force urging the second valve to
between the inlet and relief ports and so con
ward its seat, said ñrst valve being arranged to
stituted to respond to inlet port pressure acting
Yunseat in response to the working port pressure
on one end for moving said plunger in a direc
above a predetermined value, the arrangement
tion to establish communication between the
being
such that sufficient movement of the second
inlet and relief ports and to respond to working ï50
port pressure acting on the other end for mov
ing said plunger in a direction to cut ofi' commu
nication between said inlet and relief ports, means
for controlling the working port pressure acting
control valve toward its seat creates a differen
tial in .pressure on said second valve to seat it
in said passageway, the unseating of said iirst
valve being effective to dissipate the working port
pressure acting on said »other end of the plunger
to cause it to move to establish communication be
tween the inlet port and relief port, said second
valve being constructed and arranged to unseat
same in a direction to cut off communication
in response to working port pressure at a value
between the inlet and relief ports, a ñrst valve in
less than said predetermined value to permit
the slidable member normally spring seated, a 160
on said other end of the plunger comprising a
member slidable in said plunger and having a
flanged end for engaging the plunger to urge the
passageway communicating the iianged end of
the member, the ñrst valve and the said other
end of the plunger with the working port pres
said ñrst valve to seat, whereby the working port
pressure is communicated to said other end of
the plunger to cause it to move to cut off com
munication between the inlet port and relief port.
sure, a second valve in said passageway urged
65
toward~ its seat and arranged to be normallyv -
HAROLD B. SCHULTZ.
Certìíicáte of Correction
Patent No. 2,404,102.
_
July 16, 1946.
HAROLD B. SCHULTZ
It is hereby certified that error appears in the printed specification of the above
numbered patent requiring correction as follows: Column 5, lines 68, 69, and 70, claim
2, strike out the Words and comme “the first control valve seat being of smaller cross
seetional area than the second control valve seat,” and insert the same after the commeJ
and before “means” in column`6, line 1; and that the said Letters Patent should be
read with this correction therein that the same may conform to the record of the
case in the Patent Office.
Signed and sealed this 2nd day of September, A. D. 1947.
[SEAL]
LESLIE FRAZER,
First Assistant ó'ommz'ssz'oner of Patents.
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