US3221760A - Dry coil servo valve - Google Patents

Dry coil servo valve Download PDF

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Publication number
US3221760A
US3221760A US652489A US65248957A US3221760A US 3221760 A US3221760 A US 3221760A US 652489 A US652489 A US 652489A US 65248957 A US65248957 A US 65248957A US 3221760 A US3221760 A US 3221760A
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tube
nozzles
fluid
armature
valve
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Expired - Lifetime
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US652489A
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J D Buchanan
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HR TEXTRON Inc A CORP OF DE
Bell Aerospace Corp
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Bell Aerospace Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0438—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being of the nozzle-flapper type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2278—Pressure modulating relays or followers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y10T137/8659—Variable orifice-type modulator
    • Y10T137/86598—Opposed orifices; interposed modulator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y10T137/86606—Common to plural valve motor chambers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y10T137/86614—Electric

Definitions

  • An object of the present invention is to provide a valve of the aforesaid type in which the electrical parts of the valve are sealed oit in improved manner from the iluid containing chambers thereof.
  • Another object of the invention is to provide an improved valve as aforesaid which may be economically made by standard type production methods.
  • Another object is to provide a valve as aforesaid having relatively few parts.
  • FIG. 1 is a vertical sectional view, partly in diagram, of one form of the device of the invention.
  • FIG. 2 is a sectional view taken on line II-ll of FIG. 1.
  • one form of the device of the invention may be employed in conjunction with an hydraulic valve mechanism shown to comprise a body having therewithin a valve spool 25 and oil passageways (not shown) as disclosed for example in FIG l of copending U.S. patent application Serial No. 511,088 led May 25, 1955 by Martin P. Wolpin et al.; the uid passageways exiting from the valve body 15 as indicated at 16, 18, 20, 22, 30, 32 and 34.
  • an actuator comprising cylinder 24, piston 26, and connecting rod 28, or the like, may be loperatively coupled to the fluid conduits 20, 22 so that the latter open into the cylinder 24 at opposite sides of the piston.
  • the port 16 constitutes the pressured fluid inlet of the valve mechanism, while the port 18 constitutes the return line; and thus it will be understood that shifting of the valve spool 25 within the body 15, as controlled by the electro-magnetic component of the device as will be explained hereinafter, will cause the actuator 28 to be displaced in accord with the purpose of the mechainsm.
  • the fluid passageways 30, 32 normally supply oil under equal pressures from chambers at opposite ends of the valve spool 25, to corresponding opposed nozzles 40, 42 mounted as in a body block 44 and arranged to jet oil against opposite sides of a iiattened end portion 46 of the armature 50 of the electromagnetic component of the device.
  • the armature end portion 46 is disposed within an oil chamber 52 formed in body block 44, and chamber 52 communicates with port 34 which leads to the oil return conduit 18.
  • the armature end portion 46 is normally centered between the nozzles 40, 42 and is slightly spaced equally in relation therefrom, whereby constant flows of oil may pass through the nozzles 40, 42 from the chambers at opposite ends of the valve spool against the armature part 46 and thence through the return ZZW Patented Dec. 7, 1965 ICe conduit.
  • any displacement of the armature part relative to the nozzles 40, 42 will differentially throttle the latter, and thereby upset the previous pressureequilibrium at opposite ends of the valve spool 25.
  • Valve spool This Will cause the Valve spool to shift with consequent adjustment of the valve action controlling ow of oil from the inlet 16 through actuator ports 20, 22; thereby energizing the actuator 28 consonant with the degree of deiiection of the armature part 46 from its normal centralized position.
  • such resilient mounting may be arranged by providing the valve body portion to be interiorly bored to receive in slip-fitted relation a sleeve mounting in fluid-sealed relation a spring metal tube 102 which extends upwardly therefrom into fluid-sealed telescopically-titted relation within a bored portion of the armature part 50.
  • a lower stem portion 104 of the armature is force-tted at its upper end into the tubearmature assembly.
  • the armature part 104 tapers down to the nozzle control iiat end 46 thereof, and thus it will be seen that the armature unit is supported on the body member by means of the spring tube 102 which fluid-seals the nozzle chamber from the coil chamber and biases the armature toward central position relative to the nozzles while controlling oscillation movements of the armature for differential throttling of the nozzles in response to signals to the coi-ls, as explained hereinafter.
  • An O ring 106 may be used to fluid seal the sleeve 100 to the body 44 and a threaded nut 108 holds the sleeve 100 in assembled position.
  • electro-magnet coils 68, 70 are mounted within an enclosing housing 72 at opposite sides of the armature, and are arranged to be differentially energized in response to any control or error or other input signal, as is well understood in the art.
  • Permanent magnets as indicated at 74, 76 may also be employed at opposite sides of the armature for normally biasing the armature to centralized position.
  • the tube 102 functions simultaneously to normally spring-bias the armature towards nozzle-centered position and controls oscillations thereof and returns it to central position upon lapse of any biasing signal; while at the same .time it iiuid seals the coils 68, '70 from contamination by oil from the nozzle chamber of the mechanism.
  • a pilot valve for a servo valve mechanism including a body, said pilot valve comprising a flexible tube carried by said body in Huid-sealed relation therewith, two oppositely directed fluid-pressure nozzles carried by said body, an oscillating armature unit carried by said tube, said armature unit being formed with a paddle portion mounted in said tube in iiuid sealed relation therewith and extending between said nozzles, said unit being also formed with an outwardly extending lever portion on the side of said tube opposite said nozzles, said lever portion having abore receiving said tube in fluid sealed relation therewith, and motor means for causing the lever portion to be selectively biased to rock said paddle portion into variably throttling relation with said nozzle, said tube serving to center said paddle portion and control rocking thereof and serving as a fluid seal between said nozzles and said motor means.
  • a pilot valve having a body, said body having a bore therein, a sleeve tted in said body bore, a flexible tube mounted adjacent one end in said sleeve in uid-sealed relation therewith, two oppositely directed nozzles disposed Within said body, an oscillating llapper unit carried by said tubel adjacent the other end thereof and comprising a tapered flapper portion mounted at one end Within said tube in uid-sealed relation therewith, said flapper portion extending through said tube in free flapping relation therein and having its other end disposed between said nozzles, said unit also having an oppositely extending armature portion having a bore receiving said other end of said tube in uid-sealed relation therewith, and magnet means for biasing said armature portion and causing the apper unit to be selectively drawn into variable throttling relation with said nozzles, said tube serving to center said flapper portion between said nozzles and control oscillation thereof while serving as a ui

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Servomotors (AREA)

Description

Dec. 7, 1965 J D. BUCHANAN DRY con.. sERvo VALVE Filed April 12, 1957 I l J- J l i L INVENTOR.
J D BU CHANAN United States Patent O 3,221,760 DRY C011.. SERV@ VALVE J. D. Buchanan, Burbank, Caiif., assigner, by mesne assignments, to Bell Aerospace Corporation, Buffalo, NSY., a corporation of Delaware Filed Apr. 12, 1957, Ser. No. 652,489 2 Claims. (Cl. 137-82) This invention relates in general to servo mechanisms, and in particular to electro-hydraulic servo valves, such as shown in copending application, Serial No. 511,088 tiled May 25, 1955, by Martin P Wolpin et al. Furthermore, this invention comprises improvements over mechanisms as shown for example in U.S. Patents 2,655,939; 2,655,940; 2,625,136; 2,767,689; and British Patent 712,- 329 of 1954.
An object of the present invention is to provide a valve of the aforesaid type in which the electrical parts of the valve are sealed oit in improved manner from the iluid containing chambers thereof.
Another object of the invention is to provide an improved valve as aforesaid which may be economically made by standard type production methods.
Another object is to provide a valve as aforesaid having relatively few parts.
Other objects and advantages of the invention will be apparent from the following specification wherein one form of the invention is shown in the accompanying drawings, of which:
FIG. 1 is a vertical sectional view, partly in diagram, of one form of the device of the invention; and
FIG. 2 is a sectional view taken on line II-ll of FIG. 1.
As shown in the drawing, one form of the device of the invention may be employed in conjunction with an hydraulic valve mechanism shown to comprise a body having therewithin a valve spool 25 and oil passageways (not shown) as disclosed for example in FIG l of copending U.S. patent application Serial No. 511,088 led May 25, 1955 by Martin P. Wolpin et al.; the uid passageways exiting from the valve body 15 as indicated at 16, 18, 20, 22, 30, 32 and 34. As in the prior application referred to, an actuator comprising cylinder 24, piston 26, and connecting rod 28, or the like, may be loperatively coupled to the fluid conduits 20, 22 so that the latter open into the cylinder 24 at opposite sides of the piston. The port 16 constitutes the pressured fluid inlet of the valve mechanism, while the port 18 constitutes the return line; and thus it will be understood that shifting of the valve spool 25 within the body 15, as controlled by the electro-magnetic component of the device as will be explained hereinafter, will cause the actuator 28 to be displaced in accord with the purpose of the mechainsm.
As in the case of the copending patent application, the fluid passageways 30, 32 normally supply oil under equal pressures from chambers at opposite ends of the valve spool 25, to corresponding opposed nozzles 40, 42 mounted as in a body block 44 and arranged to jet oil against opposite sides of a iiattened end portion 46 of the armature 50 of the electromagnetic component of the device. The armature end portion 46 is disposed within an oil chamber 52 formed in body block 44, and chamber 52 communicates with port 34 which leads to the oil return conduit 18. The armature end portion 46 is normally centered between the nozzles 40, 42 and is slightly spaced equally in relation therefrom, whereby constant flows of oil may pass through the nozzles 40, 42 from the chambers at opposite ends of the valve spool against the armature part 46 and thence through the return ZZW Patented Dec. 7, 1965 ICe conduit. However, any displacement of the armature part relative to the nozzles 40, 42 will differentially throttle the latter, and thereby upset the previous pressureequilibrium at opposite ends of the valve spool 25. This Will cause the Valve spool to shift with consequent adjustment of the valve action controlling ow of oil from the inlet 16 through actuator ports 20, 22; thereby energizing the actuator 28 consonant with the degree of deiiection of the armature part 46 from its normal centralized position.
To provide for such operation of the armature it is resiliently mounted relative to the body portion 44, and as shown in FIG. l such resilient mounting may be arranged by providing the valve body portion to be interiorly bored to receive in slip-fitted relation a sleeve mounting in fluid-sealed relation a spring metal tube 102 which extends upwardly therefrom into fluid-sealed telescopically-titted relation within a bored portion of the armature part 50. A lower stem portion 104 of the armature is force-tted at its upper end into the tubearmature assembly. The armature part 104 tapers down to the nozzle control iiat end 46 thereof, and thus it will be seen that the armature unit is supported on the body member by means of the spring tube 102 which fluid-seals the nozzle chamber from the coil chamber and biases the armature toward central position relative to the nozzles while controlling oscillation movements of the armature for differential throttling of the nozzles in response to signals to the coi-ls, as explained hereinafter. An O ring 106 may be used to fluid seal the sleeve 100 to the body 44 and a threaded nut 108 holds the sleeve 100 in assembled position.
To cause the armature to rock upon the tube 102 as its fulcrum, electro- magnet coils 68, 70 are mounted within an enclosing housing 72 at opposite sides of the armature, and are arranged to be differentially energized in response to any control or error or other input signal, as is well understood in the art. Permanent magnets as indicated at 74, 76 may also be employed at opposite sides of the armature for normally biasing the armature to centralized position. Thus, rocking of the armature for differential throttling of the nozzles 40, 42 will be accompished in response to a signal and to a degree commensurate with the strength of the signal to the coils 68, 70, as they may overcome the balanced forces of the permanent magnets and as controlled by the spring rate of the resilient housing 102. Thus, the tube 102 functions simultaneously to normally spring-bias the armature towards nozzle-centered position and controls oscillations thereof and returns it to central position upon lapse of any biasing signal; while at the same .time it iiuid seals the coils 68, '70 from contamination by oil from the nozzle chamber of the mechanism.
What is claimed is:
1. A pilot valve for a servo valve mechanism including a body, said pilot valve comprising a flexible tube carried by said body in Huid-sealed relation therewith, two oppositely directed fluid-pressure nozzles carried by said body, an oscillating armature unit carried by said tube, said armature unit being formed with a paddle portion mounted in said tube in iiuid sealed relation therewith and extending between said nozzles, said unit being also formed with an outwardly extending lever portion on the side of said tube opposite said nozzles, said lever portion having abore receiving said tube in fluid sealed relation therewith, and motor means for causing the lever portion to be selectively biased to rock said paddle portion into variably throttling relation with said nozzle, said tube serving to center said paddle portion and control rocking thereof and serving as a fluid seal between said nozzles and said motor means.
2. A pilot valve having a body, said body having a bore therein, a sleeve tted in said body bore, a flexible tube mounted adjacent one end in said sleeve in uid-sealed relation therewith, two oppositely directed nozzles disposed Within said body, an oscillating llapper unit carried by said tubel adjacent the other end thereof and comprising a tapered flapper portion mounted at one end Within said tube in uid-sealed relation therewith, said flapper portion extending through said tube in free flapping relation therein and having its other end disposed between said nozzles, said unit also having an oppositely extending armature portion having a bore receiving said other end of said tube in uid-sealed relation therewith, and magnet means for biasing said armature portion and causing the apper unit to be selectively drawn into variable throttling relation with said nozzles, said tube serving to center said flapper portion between said nozzles and control oscillation thereof while serving as a uid seal between said nozzles and said magnet means.
4 References Cited by the Examiner UNITED STATES PATENTS 1,173,038 2/1916 Roschanek 74-18.1 X 1,827,560 10/1931 Binckley. 2,299,179 10/1942 Rosenberger 74-18.1 2,599,159 6/1952 Breedlove 137-85 2,658,392 11/1953 Vannah 137-85 X 2,767,689 10/1956 Moog 137-82 X 2,824,574 2/1958 Place 137-623 10 2,835,265 5/1958 Brandstadr 137-82 OTHER REFERENCES Moog Publication: Control Engineering, May 1955,
McGraw-Hill, page 21.
ISADOR WEIL, Primary Examiner.
KARL I. ALBRECHT, RALPH H. BRAUNER, ALAN COHAN, Examiners`

Claims (1)

1. A PILOT VALVE FOR A SERVO VALVE MECHANISM INCLUDING A BODY, SAID PILOT VALVE COMPRISING A FLEXIBLE TUBE CARRIED BY SAID BODY IN FLUID-SEALED RELATION THEREWITH, TWO OPPOSITELY DIRECTED FLUID-PRESSURE NOZZLES CARRIED BY SAID BODY, AN OSCILLATING ARMATURE UNIT CARRIED BY SAID TUBE, SAID ARMATURE UNIT BEING FORMED WITH A PADDLE PORTION MOUNTED IN SAID TUBE IN FLUID SEALED RELATION THEREWITH AND EXTENDING BETWEEN SAID NOZZLES, SAID UNIT BEING ALSAO FORMED WITH AN OUTWARDLY EXTENDING LEVER PORTION ON THE SIDE OF SAID TUBE OPPOSITE SAID NOZZLES, SAID LEVER PORTION HAVING A BORE RECEIVING SAID TUBE IN FLUID SEALED RELATION THEREWITH, AND MOTOR MEANS FOR CAUSING THE LEVER PORTION TO BE SELECTIVELY BIASED TO ROCK SAID PADDLE PORTION INTO VARIABLY THROTTLING RELATION WITH SAID NOZZLE, SAID TUBE SERVING TO CENTER SAID PADDLE PORTION AND CONTROL ROCKING THEREOF AND SERVING AS A FLUID SEAL BETWEEN SAID NOZZLES AND SAID MOTOR MEANS.
US652489A 1957-04-12 1957-04-12 Dry coil servo valve Expired - Lifetime US3221760A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3366132A (en) * 1965-10-24 1968-01-30 Charles R. Fore Electrically actuated hydraulic servovalve and torque motor
US3655148A (en) * 1969-06-20 1972-04-11 Thiokol Chemical Corp Control mechanism
US4492245A (en) * 1982-09-18 1985-01-08 Sundstrand Corporation Nozzle and flapper with squeeze film damping
US4653687A (en) * 1985-08-01 1987-03-31 Sundstrand Corporation Mixing valve
US5070898A (en) * 1991-02-11 1991-12-10 Hsc Controls Inc. Metering valve
US5184645A (en) * 1991-11-18 1993-02-09 Hsc Controls Inc. Shear orifice valve
US5197516A (en) * 1992-05-01 1993-03-30 Moog Controls, Inc. Hydraulic servo valve with controlled disengagement feature
US8997624B1 (en) 2010-04-02 2015-04-07 Jansen's Aircraft Systems Controls, Inc. Jet pipe servo with flexure pivot
US20190048900A1 (en) * 2017-08-12 2019-02-14 Hamilton Sundstrand Corporation Pneumatic servovalve assembly
US20190277423A1 (en) * 2018-03-08 2019-09-12 Hamilton Sundstrand Corporation Servovalve
US20220120356A1 (en) * 2020-10-19 2022-04-21 Buerkert Werke Gmbh & Co. Kg Valve having a valve body

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1173038A (en) * 1914-04-17 1916-02-22 Otto Roschanek Apparatus for measuring, indicating, and registering differences of pressure.
US1827560A (en) * 1928-10-29 1931-10-13 George S Binckley Means for transmission of motion
US2299179A (en) * 1941-09-08 1942-10-20 Republic Flow Meters Co Fluid seal
US2599159A (en) * 1946-09-13 1952-06-03 Harry B Breedlove Liquid level and flow control
US2658392A (en) * 1951-07-20 1953-11-10 Foxboro Co Pressure indicating pneumatic transmission system
US2767689A (en) * 1953-05-22 1956-10-23 Cornell Aeronautical Labor Inc Electrohydraulic servo valve
US2824574A (en) * 1955-04-19 1958-02-25 Westinghouse Electric Corp Hydraulic servo-valve
US2835265A (en) * 1955-11-16 1958-05-20 Bendix Aviat Corp Transfer valve

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1173038A (en) * 1914-04-17 1916-02-22 Otto Roschanek Apparatus for measuring, indicating, and registering differences of pressure.
US1827560A (en) * 1928-10-29 1931-10-13 George S Binckley Means for transmission of motion
US2299179A (en) * 1941-09-08 1942-10-20 Republic Flow Meters Co Fluid seal
US2599159A (en) * 1946-09-13 1952-06-03 Harry B Breedlove Liquid level and flow control
US2658392A (en) * 1951-07-20 1953-11-10 Foxboro Co Pressure indicating pneumatic transmission system
US2767689A (en) * 1953-05-22 1956-10-23 Cornell Aeronautical Labor Inc Electrohydraulic servo valve
US2824574A (en) * 1955-04-19 1958-02-25 Westinghouse Electric Corp Hydraulic servo-valve
US2835265A (en) * 1955-11-16 1958-05-20 Bendix Aviat Corp Transfer valve

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3366132A (en) * 1965-10-24 1968-01-30 Charles R. Fore Electrically actuated hydraulic servovalve and torque motor
US3655148A (en) * 1969-06-20 1972-04-11 Thiokol Chemical Corp Control mechanism
US4492245A (en) * 1982-09-18 1985-01-08 Sundstrand Corporation Nozzle and flapper with squeeze film damping
US4653687A (en) * 1985-08-01 1987-03-31 Sundstrand Corporation Mixing valve
US5070898A (en) * 1991-02-11 1991-12-10 Hsc Controls Inc. Metering valve
US5184645A (en) * 1991-11-18 1993-02-09 Hsc Controls Inc. Shear orifice valve
US5197516A (en) * 1992-05-01 1993-03-30 Moog Controls, Inc. Hydraulic servo valve with controlled disengagement feature
US8997624B1 (en) 2010-04-02 2015-04-07 Jansen's Aircraft Systems Controls, Inc. Jet pipe servo with flexure pivot
US20190048900A1 (en) * 2017-08-12 2019-02-14 Hamilton Sundstrand Corporation Pneumatic servovalve assembly
US10711811B2 (en) * 2017-08-12 2020-07-14 Hamilton Sunstrand Corporation Pneumatic servovalve assembly
US20190277423A1 (en) * 2018-03-08 2019-09-12 Hamilton Sundstrand Corporation Servovalve
US10859179B2 (en) * 2018-03-08 2020-12-08 Hamilton Sunstrand Corporation Servovalve
US20220120356A1 (en) * 2020-10-19 2022-04-21 Buerkert Werke Gmbh & Co. Kg Valve having a valve body
US11686403B2 (en) * 2020-10-19 2023-06-27 Buerkert Werke Gmbh & Co. Kg Valve having a valve body

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Owner name: HR TEXTRON INC., 25200 WEST RYE CANYON RD. VALENCI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TEXTRON, INC.,;REEL/FRAME:003978/0747

Effective date: 19820222