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Патент USA US3095917

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July 2, 1963
A. LATHAM, JR
SERVO VALVE
Filed April 21, 1958
3,095,907
United States Patent O ice
3,095,907
Patented July 2„ 1963
1
2
3,095,907
SERV() VALVE
Allen Latham, Jr., Jamaica Plain, Mass., assigner, by
valve having a hydraulically balanced piston therein
mesne assignments, to Borg-Warner Corporation, Chi
cago, Ill., a corporation of Illinois
which is subject to axial movement in response to a rela
tively Weak control signal, the piston thereby being adapted
to direct a iiow of hydraulic pressure fluid in relation to
the control signal Without being subject to the effect of
Filed Apr. 21, 1958, Ser. No. 729,990
the force of the pressure ñu-id controlled thereby.
12 Claims. (Cl. IS7-625.67)
Other and more particular objects, uses, and advantages
This invention relates to servo valves, and, in particular,
of this invention will become apparent upon a reading
to a hydraulic control servo valve for controlling the
of the following specification »taken in connection with the
iiow of iluid to utilization means for actuation thereof in 10 `accompanying drawing which forms 'a part thereof and
accordance with an electrical signal transmitted to the
wherein:
valve.
FIGURE 1 illustrates a control valve, in axial cross
Systems have been developed in which a valve member
section and in an enlarged scale incorporated in a hy
of a control valve is moved a small distance by a relatively
draulic system that is shown schematically.
Weak signal, such as an electrical impulse signal, whereby 15
FIGURE 2 is a sectional view of the control valve
the control valve effects ampliñcation of the control signal
illustrated in FIGURE 1 taken on line 2-2 thereof.
and converts the signal into a controlled flow of hydraulic
FIGURE 3 is a perspective View of the control valve
liu-id to a controlled valve effecting movement of a valve
piston utilized in the control valve illustrated in FIG
member thereof. Movement of the valve member of the
URE 1.
‘
controlled valve effects a ñow of hydraulic liuid from a
Reference is made to the drawing wherein like reference
source of pressure fluid to a motor or other utilization
numerals are used throughout to designate like parts
device, the hydraulic liow being proportional to and in
in the various figures thereof, and, particular reference
accordance with the strength of the particular con-trol
is made to FIGURE 1 which illustrates a hydraulic
signal. Such hydraulic systems are Well known as being
control system which may be utilized as a control system
utilized in modern aircraft where information is trans
for effecting movement of a particular aircraft mechanism
mitted into the system in the form of electrical signals
in response to information in the for-m of an electrical
from electronic equipment, such yas guidance and fire
signal received from aan electronic computer. It is to be
control computers of missiles and other armament equip
understood that the lsystem illustrated in FIGURE 1 is
ment and navigational and flight control equipment. 'I‘he
not limited only to aircraft applications but is adapted
electrical signal is derived from electrical computers and 30 to be utilized for many other types of applications. The
is fed to the servo valve or control valve to cause move
ment of the valve member thereof in a predetermined
direction and magnitude of displacement, the direction
and magnitude of displacement of the valve member being
in response and proportional to `that signal.
system comp-rises a servo or control valve, generally in
dicated by reference letter A, which is adapted to inter
connect a pressure fluid source B with a controlled
valve, generally indicated at C, tto effect axial movement of
The par 35 the controlled valve C which movement interconnects the
ticular movement of the valve member of lthe servo valve
pressure fluid source B with a utilization device or motor
effects movement of a valve member of a larger controlled
M. The flow of the pressure fluid from the controlled
valve which, in turn, interconnects 'a source of pressure
valve C Ito the utilization device is in response to a pre
iiuid with «the utilization device that is desired to be ac
determined electrical signal eifecting proportionate move
40
tuated in lresponse to the control signal.
ymen-t of the control valve A. In this manner, the piston
Since the control or servo valve is responsive to a
of the motor M is moved in a predetermined direction
relatively weak electrical signal, it is desirable that the
and for a predetermined distance to correspond to the
moving parts of the control valve ‘tbe relatively small
so that `a proportionate and accurate movement thereof
particular electrical signal fed to the control valve A. If
it is desired that the control system depicted in FIGURE
The smaller the 45 1 is to be utilized in a navigational system of an aircraft,
may be obtained from the weak signal.
control or lservo valve -is made the greater the tendency
for defects to occur therein. The tolerances of the par
ticular structure of the servo valve must be accurately
maintained as yany misalignment of 'the parts thereof would
cause leakage and malfunctioning thereof. Further, since
the relatively small moving parts of the control valve
are utilized ’to direct hydraulic pressure fluid, the moving
parts are subject to the effect of the force of hydraulic
fluid acting thereagainst. If lthe moving parts are not
hydraulically balanced, they tend to frictionally engage
the non-moving parts and are thus prevented from provid
ing an accurate movement in relation to the control signal.
`It is, therefore, an object of this invention to provide
the motor M may be adapted to `actuate a movable airfoil
thereof, such as the rudder. The navigational computer
sensing a deviation of the aircraft from a predetermined
Hight course will send the information of the deviation
in the form of an electrical impulse to the control valve
A. The control valve A will be moved axially in accord
ance with the electrical signal and cause a corresponding
movementof fthe controlled valve C to thereby intercon
55 neet the source B with the motor M to effect movement of
the piston thereof. The movement of the motor piston
causes a movement of the aircraft rudder in the desired
direction «and for a predetermined distance to compen
sate >for the deviation sensed by the nagivational com
puter and thus `returns the Aaircraft to its predetermined
valve member thereof moved in accurate proportion with 60 flight course.
respect to a relatively Weak control signal fed to the valve.
The control valve A comprises a housing 10 having a
It is -another object of this invention to provide a servo
pair of coaxial, opposed, like bores 11 and 12 interrupting
valve having la piston therein which is subject to axial
respectively, opposed ends 13 and 14 of the housing 10.
movement in response to a relatively Weak control signal.
Each bore 11 and 12 terminates at a predetermined dis
65
Itis another object of this invention to provide a servo
tance within the housing 10. The bore 11 forms an end
valve having a piston therein which is axially movable
Wall 15 in the housing 10 and the bore 12 forms an end
in response to a control signal whereby Ithe piston is
wall 16 in the housing 10. Another bore 17, having a
adapted to- interconnect a source of pressure fluid with
diameter smaller than the diameters of the bores 11 and
one utilization means and simultaneously interconnect
12, is formed in the housing 10, coaxial with bores 11
another utilization means with a sump.
and
12, and passes through both end walls 15 and 16
A further object of this invention is to provide a servo
of the housing 10.
a control or servo valve which is «adapted to have a
3,095,907
3
A pair of cover members or cup-shaped end caps 18
and 19 are adapted to be respectively fastened by any
suitable means to the ends 13 and 14 of the housing 10.
The cover members 18 and 19 cooperate respectively
with the housing 10 and bores 11 and 12 to form sealed
chambers 20 and 21.
»
-An elongated cylindrical piston 22 is disposed within
the bore 17 ofthe housing 10. Opposed ends 23 and 24
of the piston 22 are each adapted to project respectively
beyond the end Walls 15 and 16 of the housing 10 when
the piston 22 is centered within the bore 17. Piston 22 is
formed with a predetermined diameter of such a di
mension in relation to the diameter of the bore 17 of
4
The piston 22 is provided with transverse, spaced,
parallel bores 43, 44, 45, each of which has substantially
the same diameter as the corresponding passages 31, 33,
and 35. When the piston 22 is in its predetermined posi
tion relative to the housing 10, positioned therein by
spring means 23 and 30, the transverse bore 43 is coaxial
with the passage means 31, the transverse bore 44 is co
axial with the passage means 33, and the transverse bore
45 is coaxial with the passage means 3S. `One method of
assuring an accurate coaxial alignment of the transverse
bores 43, 44, and 45 with the respective corresponding
passage means 31, 33, and 35 is to bore the transverse
bores 43, 44, and 45 simultaneously through the piston
22 when the piston 22 is in its centered predetermined
ing relation with the internal surface of the housing 10, 15 position within bore 17, using the passage means 31, 33,
and 35 as the boring tool guide means. Also, the trans
delined by the bore 17, and still be adapted to be movable
' the housing 10 that the piston 22 is adapted to be in seal
relative to the housing 10 within the bore 17.
A pair of shafts '25 and 26 are each adapted to be de
tachably connected respectively to the central portions
of the ends 23 and 24 of the piston 22 and project co
axially and outwardly therefrom. Each shaft 25 and 26
is respectively connected to an armature 27 and 28 dis
verse bores 43, 44, and 45 could be formed when the
passages 3l, 33, and 35 are being formed.
The piston 22 is also provided with a pair of like, op
posed longitudinal recesses or grooves 46 and 461 formed
medially of the ends 23 and 24 of the piston 22 (see FIG
URE 3). Each medial groove 46 and 461 interconnects
posed within the respective chambers 20 and 21. It is to
the transverse bores 43, 44, and'45 with one another.
be understood that each armature 27 or» 28 may be formed
The medial recesses or grooves 46 and 461 each has a
width smaller than, or at least the same size as, the diam
integrally with the respective shaft 25 or 26, or each
armature may be formed separately and then be suitably
fastened thereto.
.
etersV of the passages 31-35, and each extends longi
tudinally of the piston 22 from passage 31 to passage 35
when the piston 22 is in its predetermined position.
Each end 23 and 24, of the piston 22 is adapted to re
Pin means 47, 48, and 49 are each disposed in and are
spectively engage a ñexible spring means 29 and 30.
Each of the spring means 29 and 30 is attached at its 30 in sealing relation respectively with the transverse bores
43, 44, and 45 of the piston 22. The pin means 47, 48,
outer end to the respective end Wall 15 or 16. The
and 49 are each formed with a diameter at least the same
springs 29 and 30 tend to maintain the piston 22 in a
size as or greater than the diameter of the respective
predetermined centered position relative to the housing
passages 31, 33, and 35. It should be understood that the
10. It is to be understood that although the shafts 25
and 26 of the armatures 27 and 28, respectively, are 35 axial lengths of the pin means 47, 48, and 49 are sub
stantially the same as the diameter of the piston 22 and
fastened to the ends 23 and 24 of the piston 22, the
permit the piston to be moved relative to the housing
springs 29 and 30 may be adapted to be suitably journalled
10 within the bore 17 thereof (see FIGURE 2) and yet
about the shafts 25 and 26 respectively by providing suit
are adapted to be in sealing relation with the internal
able apertures therein.
A pair of torque motors, indicated generally at T and 40 surface of the housing 10, deñned by the bore 17, in the
T1, are each disposed respectively in chambers 20 and 21
same manner as piston 22.
The pin means 4S is formed with a diameter that is
and may be suitably fastened to the respective end caps
18 and 19. The torque motors T and T1 are each suit
ably »connected by well known means to an electronic
computer device (not shown) which is adapted to feed
the particular torque motor an electrical signal when
appropriate. lf the electrical signal is transmitted to the
effective to divide each medial recess 46 and 461 into two
substantially equal sections 50 and 51, and 501 and 511
respectively. When the piston 22 is in its predetermined
position relative to the housing 10, the pin means 48 is
effective to prevent ñuid communication between passage
33 and either of the adjacent passages 32 and 34. Pins
torque motor T, the torque motor T eíîects movement
47 and 49 are also disposed in the respective transverse
of the armature 27 toward the torque motor T which in
turn causes axial movement of the piston 22 toward the 50 `bores 43 and 45 so that when the piston 22 is in its pre
determined position, pin means 47 prevents fluid commu
left, as viewed in the drawings. Similarly, an electrical
nication lbetween passage 31 and section 50 and thereby
impulse transmitted to torque motor T1 effects axial
prevents fluid communication between passage 31 and
movement of the piston 22 toward the right. The axial
passage 32, and, in a similar manner, pin means 49 pre
movement of the piston 22 is proportionate to the strength
of the electrical -impulse transmitted to the particular 55 vents iluid communication between passage 35 and passage
34. Because the pin means 47, 4S, and 49 have substan
torque motor. The springs 29 and 30 tend to maintain
tially the same size diameters as the corresponding pas
the piston 22 in the predetermined centered relation with
sage means 31, 33, and 35 and yet prevent ñnid commu
the housing 10 and upon termination of the electrical sig~
nication, as above stated, when the piston 22 is in its pre~
nal to either torque motor T or Tl will effect the return
60 determined position relative to the housing 10, it can be
of the piston 22 to that predetermined position.
seen that a slight movement of the piston 22 to the right
A plurality of spaced parallel passage means 31, 32,
or left from that position Will effect interconnection be
33, 34, and 35 are formed in the housing 10 interrupting
tween various of the passage means. Because of the
a mounting surface 36 thereof. Each passage means 31,
close tolerences of the sealing pin means 47, 48, and 49,
V32, 33, 34, or 35 interconnects surface 36 with the bore
17. When forming these passage means in the housing 65 with respect to the passage means 31--35, accuracy must
be maintained to prevent leakage. When the piston 22 is
10 by any well known means, such` as a multiple drill
in its predetermined position relative to the housing 10,
head, each of they passage means 31-35 may not only
only pin means 43 is subject to leakage therearound as
be formed to interconnect surface 36 with the bore 17
only passage means 33 is directing fluid to the control
but may pass completely through the housing 10 and in
terconnect the opposite surface 37 of the housing 10 with 70 valve A at this time as will later be explained. Therefore,
by positioning the pin means 47, 48, and l49 in the man
the bore 17 as illustrated in FIGURE 1. Each upper end
ner above described, it can be seen that a relatively small
of the passage means 31-35 may be sealed and closed
oiî by a pin 38, 39, 40, 41, or 42 disposed respectively
therein.
The purpose of passage means 31-35 will be
later described.
and yet accurate control or servo valve may be made
which hasv the advantage of being less susceptible to leak
75 age than conventional servo valves.
5
3,095,907
6
Although the piston 22, passage means 31-35, and
pin means 47, 43, and 49 have been described as being
connected with chamber 21 of the control valve A by a
conduit means 9‘1 interconnected with chamber 86 at
cylindrical, it is to be understood that they may have any
one end thereof and with an inlet passage 92 formed in
the end cap 19 at the other end thereof. The lower cham
ber 87 is iluidly interconnected with chamber 20 of the
control valve A by a conduit means 93 interconnected
with chamber 37 at tone end thereof and an inlet passage
means 94 formed in lthe end cap 18 at the other end
conñguration as long as the pin means are adapted to
prevent and permit ñuid communication in the later to be
described manner.
'Ihe controlled valve C comprises a bore 52 formed in
a housing 53 and is provided with an axially movable
piston 54 `disposed within the bore 52. The piston 54 has
thereof.
a plurality of spaced enlarged lands 55, 56, 57, and `58 l0
As previously stated, it is desir-able -to hydraulically
formed thereon, the lands 55 and 53 being formed at the
balance the piston 22 of the control valve A in order
respective ends of the piston 54 and the lands 56 and 57
to prevent the hydraulic pressure iluid controlled thereby
being formed on the piston 54 intermediate and spaced
from effecting the lateral movement of the piston 22.
from the lands 55 and 58 and from one another. Land
One means of hydraulically balancing the piston 22 is illus
55 defines with one end of the bore 52 a pressure receiv 15 strated in FIGURE 2. A plurality of spaced parallel pas
ing chamber 59 and land 5S deiines with the other end
sages 95 are formed in the valve housing 10, each passage
of the bore 52 and other pressure receiving chamber 60.
95 being disposed perpendicular to and interconnected
Chambers 59 and 60 are later referred to as utilization
with the respective passages 31-35 intermediate the
means as will become apparent upon a reading of the op
mounting surface 36 and the bore 17. A plurality of
eration of the system which is later presented. Lands 55 20 passages 96, similar to the passages 95, are formed in
and 56 cooperate with the bore 52 to define a chamber
the housing 10 and each are interconnected respectively
61 therebetween, lands 56 and 57 cooperate with the
with the passages 31-35 intermediate the top surface 37
bore 52 to define a chamber 62 therebetween, and lands
and the bore 17. A plurality of passages 97 are formed
57 and 58 also cooperate with the -bore 52 to define a
in the housing 10 and each are disposed perpendicular t0
chamber 63 ltherebetween. Chamber 61 is fluidly con 25 the passages 95 and 96 and respectively interconnect the
nected to a sump S Vby means of a passage means 64
passages 95 and 96 together. The passages 95, 96, and 97
formed in the housing 53 which interconnects a passage
are formed in the housing 10 in a manner to facilitate ease
means 65, shown schematically, that is, in turn, iluidly
of production, such as by drilling, and a plurality of pins
connected -to the sump S. Chamber 62 is fluidly inter
98 are disposed in each end of the passages 95, 96, and
connected with the pressure fluid source B by means of a
passage means 66 connected to the source B at one end
30
97.
It can Ibe seen that each passage 3‘1-35 includes an
interconnected network of passages 95, 96, and 97 thereby
permitting each passage 31-35 to be interconnected «with
53 at the other end thereof. Chamber 62 is also tluidly
the bore 17 at opposed points whereby each passa-ge 31
interconnected with the passage means 33 of the control
35 is adapted to be simultaneously interconnected with ap
valve A by means of a passage means 68 Iformed in the 35 propriate pairs of sections 50, 501 or 51, 511 when the
housing 5S and an interconnecting passage means 69.
piston 22 is axially moved. In this manner the piston 22
Chamber 63 is fluidly interconnected with the sump S
is adapted to be hydraulically balanced, i.e., when hy
by means of a passage means 70 formed in the housing
draulic pressure iiuid is delivered to section 5l) or 5-1 of
53 which is in turn fluidly interconnected with the pas
the groove 46 it is also delivered to the corresponding sec
thereof and to a passage means 67 formed in the housing
sage means 65.
Passage means 31 and 35 of the control valve A are
40 tion 591 or 511 of the groove 461 by the respective pas
«llui‘dly interconnected to conduit 65 by passage means 71
and 72 respectively. Passage means 32 and 34 of the
control valve A are respectively interconnected with cham
bers 59 and 6i) by passage means 73 and 74.
45
A pair of spaced passage means 75 and 76 are formed
in the housing 53 of the control valve C and are respec
sages 95, 96, and 97. if pressure ñuid is not directed
simultaneously to the corresponding sections 501, 561 or
51, 511, it can be seen that the pressure iiuid directed only
to the sections 5€) or 51 would tend to force the piston 22
upwardly into frictional engagement with the internal sur
face of the housing 10 thereby hindering accurate axial
movement of the piston 22 relative to the housing 10 in re
sponse to the control signals fed to either torque motor T
tively interconnected with the left and right sides of the
motor M by conduit means ‘77 and 78. When piston 54
and T1. This hydraulic “sticking” of the piston 22 within
of the controlled valve C is in its null position, i.e. when 50 the bore 17 is prevented by providing means for hydrauli
piston 54- is fully centered with respect to the bore 52
cally balancing the piston 22, such as described above,
of housing 53, lands 56 and 57 respectively prevent ñuid
whereby the hydraulic pressure fluid directed by the con
communication between either chamber 61 or 62 and pas
sage means 75 and between either chamber 62 or 63 and
passage means 76.
trol valve A has no effect on the function thereof.
The operation of the hydraulic system depicted in FIG
55 URE 1 is as follows: Assuming that the electronic com
A flow sensor device F is disposed in iluid communica
tion with the conduit means 78 at a point intermediate
the passage means 76 of the housing 53 and the right
side of the motor M. The flow sensor device F comprises
a housing 79 having a chamber 86 »formed therein, de 60
ñned by a bore 81.
The conduit or passage means 7S
lluidly interconnects the upper end of chamber Sti by
means of a passage means 82 forme-d in the housing 79.
puter, which is to determine the operation of the mo-tor M,
concludes that the piston of motor M should be moved to
the left, as viewed in the drawing, the computer sends an
elecrtical impulse signal to the torque motor T1. The
strength of t-he electrical signal determines the extent of de
sired displacement ott the piston of motor M. Torque
motor T1, thus energized, causes movement of the arm
ature 28 toward the torque motor T1 effecting axial move
ment of the piston 22 of the control valve A to the right.
The lower end ofthe chamber 80 is, in turn, fluidly inter
connected with the right side -of motor M by a passage 65 Movement of the piston 22 to the right permits pressure
means S3 -formed in the housing 79. A plate 34 is dis
ñuid from the source B to pass through passage means 33
posed intermediate the upper and lower ends of chamber
into section 56 of the piston ‘22 and out through passage
89 and is provided with a central aperture 85 therein.
means 32. This ñow of fluid pressure passes from pas
Plate 84- divides chamber 89 into an upper chamber 36
sage means 32 through passage means 73 to the chamber
and a lower chamber 87. A baftle 8S is adapted to be 70 or utilization means 59 of the controlled valve C. The
telescopically received within the aperture S5 of the plate
force of the pressure lluid within chamber or utilization
84 and is retained in a position tending to prevent fluid
means 59 causes axial movement of the piston 54 thereof
communication between the upper chamber 86 and lower
to the right. Any pressure fluid within the chamber or
chamber 87 of the flow sensor device F by opposed spring
utilization means 60 of the controlled valve C will be
means S9 and 90. The upper chamber 86 is fluidly inter 75 discharged by movement of the piston 54 to the right
..
3,095,907
8
forcingthe pressure iluid through conduit means 74, pas
sage means 34 of the control valve A, section 51 of the
piston 22, and out through passage means 35 to the
sump S by means of passage means 72 and 65.' Move
ment of the piston 54 of the controlled valve C to the right
right by the electronic computer, an electrical impulse
is directed to torque motor T and the converse in opera.
tion `occurs in substantially vthe same manner as that
presented above when >the impulse is directed to torque
motor T1. Ít is to be understood that upon actuation
of torque motor T the ñow of pressure fluid from source
effects Huid communication between the source of pres
B to the motor M is through conduit means 77 and from
sure fluidv B, through passage means 66 and 67, chamber
the 4rnotor M through conduit means 7S, flow sensor de
62, and passage means 76, with the conduit means 7S.
vice F «to the sump S.
The ñuid pressure delivered by conduit means 7S to the
As can be seen, there has been disclosed a control
flow sensor device F enters the upper chamber 86 and 10
valve or servo valve which is relatively simple to manu
causes movement of the shuttle or battle device Sd down
facture yet effective to cause ampliiication of relatively
wardly to permit the duid within chamber S6 to pass
weak electrical signals and convert same int-o a hydraulic
through the aperture 85 into the lower chamber 87 and
control signal to effect movement of a hydraulic valve
subsequentlyto the right side of the motor M etîecting
and the subsequent movement of the utilization device in
movement of the piston thereof to the left. This leftward
accordance with the electrical signal.
movement of the piston of the motor M causes the pres
While the servo valve A has been disclosed as being
sure fluid at the left side of the piston of the motor M to
utilized as operating a controlled valve C, it is to be
be expelled through conduit means 77', passage means 75,
understood that the control valve A may be utilized in
chamber 61, passage means 64, and passage means 65 to
the sump S.
20 many different applications in which a controlled valve
is not used, the control valve directly effecting movement
Since the fluid from the source B is flowing through con
of a utilization device or devices.
duit means 78 by movement of the controlled valve C
While the various parts of this invention have been
to the right, the pressure within the upper chamber 86 of
referred to as being located in the upper or lower, right
the ñow sensor device F is greater than the pressure within
the lower chamber 87. This differential in pressure is 25 or left, position and moving to the right or left, and
upwardly or downwardly, it will be understood that this
caused by the restricted orifice in the iiow sensor device F,
is done solely for the purpose of facilitating description
formed by the relation of the shuttle device S8 with re
and such references relate only to the relative positions
spect to the aperture 85 of the plate 84. Since chamber
or movements of the parts as shown in the accompany
20 of the control valve A senses therpressure in the lower
chamber 87 of the How sensor deviceF and chamber 21 30 ing drawing.
Also, it is to be understood that many changes and
thereof senses the pressure of the upper chamber 86, the
modiñeations may be made to the structure of the
pressure ñuid Within chamber 26 is lower in pressure value
valve disclosed without departing from the spirit and
than that within chamber 2l. Therefore, the pressure dif
scope of the invention which is deñned by the appended
lferential existing between chamber 2d and 21 is such that
the force of the pressure fluid vwithin chamber 211 acting 35 claims.
What is claimed is:
on the end 24 of the piston 22 and the armature 28 causes
1. A fluid control valve device comprising: Ia housing
movement of the piston 22. to the left in opposition to the
having a bore therein; means defining a plurality of
force of the torque motor Tl tending to maintain the pis
spaced passage means disposed in said housing intercon
ton 22 in its displaced position to the right. This feed
back arrangement of chambers 24B and 2l permits a close 40 necting said bore with the exterior of said housing, said
passage means including at least one passage means and
regulation off the control valve A in response to the flow
a pair of passage means being so disposed whereby each
of the pressure fluid directed by the controlled valve C
passage means of said pair is disposed adjacent to said
to the motor M.
one passage means; movable piston means disposed in
When the piston of motor M has moved to the Áleft a
sufficient distance to satisfy the requirements of the elec 45 said bore, said piston means having medial recess means
formed therein; biasing means carried by said housing
tronic computer, the electrical impulse directed to torque
tending to maintain said piston means in a predetermined
motor T1 is terminated by the computer and the force
position relative to said housing; pin means carried by
of the pressure iluid within chamber 21 acting on the
end 24 of the piston 22 and the armature 23 moves
said piston means dividing said recess means into sec
the piston 22 to the left past 4its null position in opposition 50 tions, one of said pin means being adapted to prevent
to the force of the springs 29 and 30 tending to maintain
, -the piston 22 in its predetermined position, i.e. its null
position. When the piston 22 is moved to the left the
pressure fluid from passage means 33 is fluidly intercon
nected through section 5l with passage means 34 and sub
sequently «with the chamber or utilization means 60
`through passage means 74. Chamber or utilization means
59 is now connected with the sump S by passage means
fluid communication between said one pass-age means
and each passage means of said pair of passage means
when said piston means is in said predetermined posi
tion; and means carried by said housing being adapted
to cause selected axial movement of said piston means
relative to said housing in opposition to said biasing
means whereby said pin means permits certain of said
sections to ñuidly interconnect said one passage means
with one of the passage means of said pair of passage
73 and 32, section 50, and passage means 31, 71, and 65.
The `force of the pressure ñuid within chamber 60 vacting 60 means.
2. A ñuid control valve device comprising: a housing
on the end of .land 58 then returns piston 54 toward its null
having
a bore therein; means defining a plurality of
position. When piston 54 is in its null position, no pres
spaced passage means disposed in said housing inter
sure -fluid is ñowing through the flow sensor device F
connecting said bore with the exterior of said housing,
whereby the pressure values of the pressure fluids within
said passage means including at least »one passage means
the upper chamber S6 and the lower lchamber 87 thereof
and a pair of passage means being so disposed whereby
are equal causing the pressure values or the pressure iluid
each passage means of said pair is disposed adjacent to
within chambers 20 and 2ly of the control valve A also to
said one passage means; movable piston means disposed
be equal. Since the respective pressure values of the pres
in said bore, said piston means having medial recess
sure fluids within chambers 20 and 21 lare now equal, the
springs 29 and 3€) of the control valve A are adapted 70 means formed therein; biasing means carried by said
housing tending to maintain said piston means in a pre
to position 4the pist-on 22 to its null or predetermined posi
determined position relative to said housing; means de
tion and the system remains as shown in FiGURE l until
ñning a transverse bore in said piston means passing
the torque motors T and T1 receive another electrical
through said recess means; pin means being disposed
signal effecting a change therein as above described.
in said transverse bore of said piston means dividing
When the motor M is desired to be moved to the
3,095,907
9
said recess means into sections, one of said pin means
of passage means being so disposed whereby each pas
sage means ot‘ said pair is disposed adjacent to said one
being adapted to prevent fluid communication between
said one passage means and each passage means of said
passage means; means iiuidly interconnecting said one
pair of passage means when said piston means is in said
predetermined position; and means carried by said hous
ing being adapted to cause selected axial movement of
said piston means relative to said housing in opposition
to said biasing means whereby said pin means permits
certain of said sections to iluidly interconnect said one
passage means with said pressure iluid source; means
5,
iiuidly interconnecting each passage vmeans of said pair
of passage means with each of said utilization means;
movable piston means disposed in said bore, said piston
means having medial recess means formed therein; bias
'ing means carried by said housing tending to maintain
passage means with one of the passage means of said 10 said piston means in a predetermined position relative
pair of passage means.
to said housing; means delining a transverse bore in said
3. A iluid control valve device comprising: a housing
having a bore therein; means defining a plurality of
piston -means passing through said recess means; pin
means lbeing disposed in said transverse lbore of said piston
spaced, substantially parallel passage means disposed in
dividing said recess means into sections, one of
said housing interconnecting said bore with the exterior 15 means
said pin means being adapted to prevent fluid communica
of said housing, said passage means including at least
one passage means and a pair of passage means being
tion between said one passage means and each passage
means of said pair of passa-ge means when said piston
so disposed whereby each passage means of said pair
means is in said predetermined position; and means carried
is disposed adjacent to said one passage means; movable
by said housing being adapted to cause selected axial
piston means disposed in said bore, said piston means 20 movement of said piston means relative to said housing
having a pair of opposed medial recess means formed
in .opposition to said ‘biasing means whereby said pin
therein; biasing means carried by said housing tending
means permits certain of said sect-ions to »iiuidly inter
to maintain said piston means in a predetermined posi
connect said one passage means with one of `the passage
tion relative to said housing; means defining a trans
verse bore in said piston means passing through said 25 means of said pair of passage means to thereby inter
connect one of said utilization means with said pressure
recess means; pin means being disposed in said trans
iiuid source.
verse bore of said piston means dividing said recess
6. A fluid control valve device being adapted to se
means into two pairs of sections, one of said pin means
lectively
interconnect one of a pair of utilization means
being yadapted to prevent fluid communication between
with
a
pressure
iìuid source comprising: a housing hav
said one passage means and each passage means of said
30 ing a lbore therein; means deiining a plurality of spaced,
pair of passage means when said piston means is in
substantially parallel passage means disposed in said
said predetermined position; and means carried by said
housing
interconnecting said bore with the exterior of
housing being adapted to cause selected axial movement
said housing, said passage means including at least one
of said piston means relative to said housing in opposi
tion to said biasing means whereby said pin means 35 passage means and a Ipair of passage means being so dis
posed wherebyeach passage means of said pair is dis
permits one pair of said sections to ñuidly interconnect
posed adjacent to said one passage means; means fluidly
said one passage means with one of the passage means
interconnecting said one passage means with said pres-l
of said pair of passage means.
sure íiuid source; means iiuidly interconnecting each
4. A ñuid control valve device being adapted to se
lectively interconnect one of a pair of utilization means 40 passage means of said pair of passage means with each
of said utilization means; movable piston means dis
with a pressure iiuid source comprising: a housing hav
posed in said bore, said piston means having a pair of
ing a bore therein; means deiining -a plurality of spaced
passage means disposed in said housing interconnecting
said bore with the exterior of said housing, said pas
opposed medial recess means formed therein; biasing
means carried by said housing -tending to maintain said
piston means in a predetermined position relative to
a pair of passage means being so disposed whereby 45 said housing; means defining a transverse bore in said
piston means passing through said recess means; pin
each passage means of said pair is disposed adjacent
means being disposed in said transverse lbore of said piston
to said one passage means; means iiuidly interconnecting
means dividing said recess means into two pairs of sec
said one passage means with said pressure iluid source;
tions, one of said pin means being adapted to prevent iluid
means ñuidly interconnecting each passage means of
communication between said one passage means and each
said pair of passage means with each of said utilization
passage means of said pair of passage means when said
means; movable piston means disposed in said bore,
piston means is in said predetermined position; and means
said piston means having medial recess means formed
sage means including at least one passage means and
therein; biasing means carried by said housing tending
carried by said housing being adapted to cause selected
axial movement _of said piston means relative to said
to maintain said piston means in a predetermined posi
tion relative to said housing; pin means carried by said 55 housing in opposition to said biasing means lwhereby said
pin-means permits one pair of said section-s to fluidly
piston means dividing said recess means into sections,
interconnect said one passage means with one of the pas
one of said pin means being adapted to prevent ñuid
sage means of said pair of passage means to thereby in
communication between said one passage means and
terconnect one of said utilization means with said pres
each passage means of said pair of passage means when
said piston means is in said predetermined position; `and 60 sure fluid source.
7. A fluid control valve device comprising: a housing
means carried by said housing being adapted to cause
having a bore therein; means defining a plurality off
selected axial movement of said piston means relative
spaced pass-age means disposed in said housing inter
to said housing in opposition to said biasing means
connecting said bore with the exterior of said housing,
whereby said pins means permits certain of said sections
to tiuidly interconnect said one passage means with one 65 said passage means including at least one passage means,
a iirst pair of passage means and a second pair of pas
of the passage means of said pair of passage means to
thereby interconnect one of said utilization means with
sage means being so disposed whereby each passage
said pressure iiuid source.
means of said first pair of passage means is disposed ad
5. A iiuid control valve device being adapted to se
jacent to said one passage means and each passage means
lectively interconnect one of a pair of utilization means 70 of said second pair of passage means is disposed lremote
with a pressure iiuid source comprising: a housing hav
from said one passage means and adjacent to one of the
ing a bore therein; means defining a plurality of spaced
passage means of said first pair of passage means; mov
pass-age means disposed in said housing interconnecting
said bore with the exterior of said housing, said passage
able piston means disposed in said bore, said piston
means having medial recess means formed therein; ibias
means including at least one passage means and a pair 75 mg means carried by said housing tending to maintain
3,095,907
11
said piston means in a predetermined position relative to
said housing; a plurality of spaced pin means carried by
said piston means dividing said recess means into sec
tions, said pin means being so spaced that whensaid
piston means is in said predetermined position one of
said pin means prevents fluid communication between
t
-
j
12
v
l
v
said housing tending to maintain said piston means in
predetermined position relative to said housing; means
defining a plurality of spaced transverse bores in said
piston means passing through said recess means; a piu
rality of pin means, each of said pin means being disposed
iirst pair of passage means and other of said pin means
prevent fluid communication between each passage means
in one ofrsaid transverse bores of said piston means divid
ing said recess means into two pairs of s ctions, said pin
means being so spaced that when said piston means is in
said predetermined position one of said pin means prevents
of said iirst pair of passage means and its adjacent pas
ñuid communication between said one passage means
sage means of said second pair of passage means; and
means carried by said housing adapted to cause selected
axial movement of said piston means relative to said
and each passage meansof said tiret pair of passage
means and other of said pin means prevent duid communi
cation between each passage means of said first pai-r of
passage means and its` adjacent passage means of said
second pair of passage means; and means carried by said
housing adapted to cause selected axial movement of said
piston means relative to said housing in opposition to said
said one passage means and each passage means of said
housing in opposition to said biasing means whereby said
pin means permits certain of said sections to ñuidly inter
connect said one passage means with one of the passage
means of said first pair of passage means and permits
biasing means whereby said pin means permits one pair
others of said sections to iiuidly interconnect the other
of said sections to ñuidly interconnect said one passage
passage means of said ñrst pair of passage means with its
said adjacent passage means of said second pair of passage 20 means with one of the passage means of said first pair Y
of pass-age means and’ permits the other pair of said sec
means.
tions to fluidly interconnect the other passageineans of
8. A fluid control valve device comprising: a housing
said ñrst pair of passage means with its said adjacent
having a «bore therein; means defining a plurality of
passage means of said second pair of passage means.
spaced passage means disposed in said housing inter
10. A fluid control valve device being adapted to selec
connecting said bore with the exterior of said housing, 25
tively interconnect one of two utilization means with a
_said «passage means including at least one passage means,
pressure fluid source and simultaneously interconnect the
a iirst pair of passage means and a second pair of pas
other of said utilization means with a sump comprising:
_sage means being so disposed whereby each passage
a housing having a bore therein; means defining a plu~
means of said first pair of passage means is disposed ad
jacent to said one passage means and each passage means 30 rality of spaced passage means disposed in said housing
of said second pair of passage means is disposed remote
interconnecting said bore with the exterior of said hous
from said one passage means and adjacent to one of the
passage means of said first pair of passage means; mov
ing, said passage means including at least one passage
able Vpiston means disposed in said bore, said piston
means having medial recess means formed therein; «bias
ing means carried by said housing tending to maintain
said piston means ina predetermined position relative to
said housing; means deiining a plurality of spaced trans
verse bores in said piston .means passing through said
recess means; a plurality of pin means, each of said pin
means being disposed in one of said transverse bores
of said piston means dividing said recess -means into
means, a first pair of passage means and a second pair
of passage means being so disposed whereby each pas
35 sage means of said first pair of passage means is dis
posed adjaeent to said one pass-age means and each pas
sage means of said second pair of passage means is
disposed remote from said one passage means and ad
jacent to one of the passage means of said first pair of
40 passage means; means ñuidly interconnecting said one
passage means with said pressure fluid source; means
fiuidly interconnecting each passage means of said first
pair of pass-age means with each of said utilization
sections, said pin means being so spaced that when said
means; means liuidly interconnecting each passage means
piston rmeans is in said predetermined position one odi
45
of said second pair of passage means with said sump;
said pin «means prevents ñuid communication between
said one passage means and each passage means of said
movable piston means «disposed in said bore, said piston
ñrst pair of passage means and other of said pin means
means having medial recess means formed therein; bias
ing means carried by said housing tending to maintain
prevent huid communication between each passage fmeans
of said ñrst pair of passage means and its Vadjacent pas 50 said piston means in a predetermined position relative
to said housing; a plurality of spaced pin means carried
sage means of said second pair of pass-age means; and
means carried by said housing adapted to cause selected
by said piston means dividing said recess means into
axial movement of said pis-ton means relative to said
sections, said pin means being so spaced that when said
housing in opposition to saidV biasing means whereby said
piston means is in said predetermined position one of said
pin means permits certain off said sections to fluidly in 55 pin means prevents ñuid communication between said
terconnect said one passage .means with one of the pas
one passage means and each passage means of said ñrst
sage means of said first pair of passage means and per‘
mits :others of said sections to -ñuidly interconnect the
other passage means of said first pair of passage means
with its said adjacent passage means of said second pair
pair of passage means and ‘other of said pin means pre
vent iiuid communication between each passage means
of said first pair of passage means and its adjacent pas
60 sage means of said second pair of passage means; and
means carried by said housing adapted to cause selected
of passage means.
9. A fluid control valve device comprising: a housing
axial movement of said piston means relative to said
housing in opposition to said biasing means whereby said
having a bore therein; means defining a plurality of
spaced, substantially parallel passage means Vdisposed in
said housing interconnecting said bore with the exterior
pin means permits certain of said sections .to fiuidly inter
connect said one passage means with one of the passage
of said housing, said passage means including at least 65 means of said ñrst pair of passage means and permits
one passage means, a first pair of passage means and a
others of said sections to fluidly interconnect the other
second pair of passage means being so disposed whereby
passage means »of said first pair of passage means with its
,each passage means of said Vfirst pair of passage means
_said «adjacent passage means of said second pair of pas
is disposed adjacent to said one passage means and each
sage means to thereby ñuidly interconnect one of said
70
utilization means with said pressure ñuid source and the
passage means `of said second pair of passage means is
other of said utilization means with said sump.
l_disposed remote from said one passage means and ad~
ll. A fluid control valve device being «adapted «to se
jacent to one of the passage means of said ñrst pair of
lectively interconnect one of two utilization means with
passage means; movable piston means ldisposed in said
bore, said piston means having a pair of oppose-d medial 75 a pressure ñuid source andv simultaneously interconnect
the other of said utilization means with a sump compris
recess means formed therein; biasing means carried by
3,095,907
13
14s
ing: a housing having a bore therein; Vmeans deñning a
plurality of spaced passage means disposed in said housing
interconnecting said bore »with the exterior of said hous
at least one passage means, .a iirst pair of passage means
and a second pair of passage means being so disposed
ing, said passage means including at least `one passage
means, a iirst pair of passage means and a second pair
means is disposed adjacent to said one passage means and
each passage means of said second pair of passage means
is disposed remote from said one passage means and ad
jacent to one of the passage means of said first pair of
passage means; means ñuidly interconnecting said one
of passage means `being so disposed whereby each pas
sage means ot said iirst pair of passage means is disposed
adjacent to said one passage means and each passage
means of said second pair of passage means is disposed
whereby each passage means of said iirst pair of passage
passage means with sai-d pressure ñuid source; means
remote from said one passage means and adjacent to one 10 iiuidly interconnecting each passage means of said first
of the passage means of said ñrst pair of passage means;
pair lof passage means with each of said utilization means;
means ñuidly interconnecting said `one passage means
means iiuidly interconnecting each passage means of said
with said pressure -fluid source; means ñuidly intercon
second pair of passage means with said sump; movable
necting each passage means of said first pair of passage
piston means disposed in said bore, said piston means
means with each of said utilization means; means iluidly 15 having a pair of opposed medial recess means formed
interconnecting each passage means of said second pair
therein; biasing means 'carried by sai-d housing tending to
of passage means with said sump; movable piston means
maintain said piston means in a predetermined position
disposed in said bore, said piston means having medial
relative to said housing; means defining a plurality of
recess means formed therein; biasing means carried by
»spaced transverse bores in said piston means passing
said housing tending to maintain said piston means in a 20 through said recess means; a plurality of pin means, each
predetermined position relative to said housing; means
of said pin means being disposed in one of said trans
deñning a plurality of spaced transverse bores in said
verse bores of said piston means »dividing said recess
piston means passing through said recess means; a plu
means into at least two pairs of sections, said pin means
rality of pin means, each of said pin means being dis
being so spaced that when said piston means is in said
posed in one of said transverse bores of said piston means 25 predetermined position one of said pin means prevents
dividing said -recess means into sections, said pin means
fluid communication between said one passage means
being so spaced that when said piston means is in said
and teach passage means of said first pair of passage
predetermined position one of said pin means prevents
means and other of said pin means prevent ñuid com
fluid communication between said one passage means
muni-cation between e‘aoh passage means of said iirst pair
and each passage means of said -iirst pair of passage means 30 of passage means and its adjacent passage ymeans of said
and other of said pin means prevent iiuid communication
second pair of passage means; and means carried by said
between each passage means of said iirst pair of pas
lhousing adapted to cause selected axial movement of
sage means and its adjacent passage means `of said sec
said piston means relative to said housing in opposition
ond pair of passage means; and means carried by said
to said biasing means whereby said pin means permits
housing adapted to cause selected axial movement of 35 one pair of said sections to ñuidly interconnect said one
said piston means relative to said housing in `opposition
passage means with one of the passage means of said
to said biasing means whereby said pin means permits
iirst pair of passage means and permits the other pair of
certain `of said sections to ñuidly interconnect said one
said sections to fluidiy interconnect the other passage
passage means with `one of the passage means of said
means of said ñrst pair of passage means with its said
iirst pair of passage means and permits others lof said 40 adjacent passage means of said second pair of passage
sections to -ñuidly interconnect the other passage means
means to thereby ñuidly inteiiconnect one of said utiliza
of said ñrst pair of passage means with its said adjacent
tion means with said pressure fluid source and the other
passage means of said second pair `of passage means to
of said utilization means with the sump.
thereby fluidly interconnect one of said utilization means
References Cited in the iile of this patent
with said pressure fluid source and the other of said 45
utilization means with said sump.
12. A fluid control valve device being adapted to selec
UNITED STATES PATENTS
tively interconnect one of two utilization means with a
2,591,800
Gardiner _____________ __ Apr. 8, 1952
pressure ñuid source and simultaneously interconnect the
other of said utilization means with a sump comprising: 50
a housing having a bore therein; means defining a plu
2,616,449
2,731,980
Maha _______________ __ Nov. 4, 1952
Diefenderfer _________ __ Ian. 24, 1956
2,853,976
2,875,782
2,909,195
Gerwig et ral. ________ __ Sept. 30, 1958
Shih-Ying Lee ________ __ Mar. 3, 1959
Keyt ________________ __ Oct. 20, 1959
2,920,650
Moog _______________ __ Jan. 12,
rality of spaced, substantially parallel passage means :dis
posed in said housing interconnecting said bore with the
exterior of said housing, said passage means including
`1960
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