US2915077A - Diaphragm-flapper assembly - Google Patents
Diaphragm-flapper assembly Download PDFInfo
- Publication number
- US2915077A US2915077A US63718357A US2915077A US 2915077 A US2915077 A US 2915077A US 63718357 A US63718357 A US 63718357A US 2915077 A US2915077 A US 2915077A
- Authority
- US
- United States
- Prior art keywords
- magnetic
- orifices
- chambers
- plate
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
-
- 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
- F15B5/00—Transducers converting variations of physical quantities, e.g. expressed by variations in positions of members, into fluid-pressure variations or vice versa; Varying fluid pressure as a function of variations of a plurality of fluid pressures or variations of other quantities
- F15B5/003—Transducers converting variations of physical quantities, e.g. expressed by variations in positions of members, into fluid-pressure variations or vice versa; Varying fluid pressure as a function of variations of a plurality of fluid pressures or variations of other quantities characterised by variation of the pressure in a nozzle or the like, e.g. nozzle-flapper system
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/44—Automatic controllers pneumatic only
- G05B11/48—Automatic controllers pneumatic only with auxiliary power
- G05B11/50—Automatic controllers pneumatic only with auxiliary power in which the output signal represents a continuous function of the deviation from the desired value, i.e. continuous controllers
-
- 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
Definitions
- This invention relates to flow control means for a hydraulic transfer valve and more particularly to a dual purpose diaphragm-dapper assembly that is used in a hydraulic transfer valve to control the passage of high pressure hydraulic fluid ⁇ through a pair of orifices in thev'alve and to prevent the direct flow of hydraulic fluid between ⁇ a pair of chambers in the valve.
- the present invention is concerned with and forms an integral partof only two of the three main components of a hydraulic transfer valve: the motor and the hydraulic amplifier.
- the diaphragm-dapper assembly is shown and described herein as forming a component part of a hydraulic transfer valve in which the valve motor is comprised of a magnetic circuit and the hydraulic amplifier is comprised of a pair of fluid passage orifices adapted to be intermittently covered and uncovered by a flapper.
- the diaphragm-dapper assembly a flexible diaphragm or plate with a apper rigidly mounted thereon, is positioned in the valve so that the diaphragm forms a component part of the magnetic motor circuit in addition to preventing a direct flow of hydraulic l iiuid over and around the other components of the magnetic motor circuit. Being so positioned, the diaphragm not only supports the flapper for rotation between a plurality of controlling positions relative to the uid passage orifices, but also prevents contamination of the hydraulic uid disposed in the magnetic motor circuit of the valve and prevents contamination of the hydraulic fluid surrounding the fluid passage orifices.
- the primary object of the present invention is to mount a hydraulic transfer valve flapper on a flexible diaphragm or plate.
- Another object of the invention is to prevent contamination of the fluid in the magnetic motor circuit in a hydraulic transfer valve.
- Another object of the invention is to use allexible diaphragm or plate as a component part of the magnetic motor circuit in a hydraulic transfer valve.
- Fig, l is a schematic illustration of one environmental I application of the diaphragm-dapper assembly
- Fig. 2 is a top plan View of the preferred embodiment of the diaphragm-dapper assembly
- Fig. 3 is a section taken along the line III-Ill in Fig. 2;
- Fig. 4 is a side elevation of the preferred embodiment of one of the components shown in Figs. 2 and 3;
- Fig. 5 is an end elevation of the component of the diaphragm-dapper assembly shown in Fig. 4;
- Chamber 12 defines a floor or flat surface16 within the bodyv ofcasing 10 and chamber 14 defines av pair lof opposed walls v18 and'20V therein.
- Walls 18 and 20 have mounted therein a pair ofspaced and opposed nozzles 22 and ⁇ 24 which communicate with a pair of uid passages 26 and 28, respectively, in casing 10.
- Nozzles 22 and 24 are provided with a pair of uid passages or orifices 30 Vand 32, respectively, therein which accommodate the passage therethrough of pressurizedl hydraulic fluid from casing passages 26 and 28,.
- Pres-l surized hydraulic'fluidlowing through orifices 30 andl 32 is discharged into4 casing chamber 14 from whereit is conducted by a passage 33 (shown in outline) inv casing 10 to another component ofthe hydraulic transfer valve which is, likewise, shownin outline in Fig. 1.
- control pressures thus created are then applied by any suitable means to another component of the valve, such as the spring-biased flow Vcontrol piston 35, shown in outline.
- the orifices30 and 32 therefore, serve ⁇ as an integral part of a control means to accurately adjust the rate of flow of pressurized uid through the hydraulic transfer valve.
- adiaphragmflapper assembly Cooperating with the orifices 30 and 32 ⁇ and positioned between casing chambers 12 and 14 is adiaphragmflapper assembly, generally designated by the reference numeral 34, and best shown in Figs. 1 and 3.
- the structural details of the preferred embodiment of the diaphragmapper assembly 34 are best shown, however, in Figs. 3, 4 and 5 wherein the assembly includes a flexiblemagnetic material plate or diaphragm 36 provided with a pair of opposed faces 38 and 40 thereon. Rigidly attached to plate 36 at the approximate geometric center thereof is a apper member or bar generally designated by the reference numeral 42.
- the preferred embodiment of the flapper ⁇ 42 comprises a two-piece, axially aligned construction including an upper portion 44 and a lower portion 46 extending substantially laterally of plate 36 from faces 38 and 40, respectively.
- the two flapper portions 44 and 46 are retained in assembled ,engagementby a threadedconnection, portion 44 being provided with a threaded shank 48 and portion 46 beingv provided ,with a threaded passage 50 thereon.
- a centrally disposed aperture S2 in plate 36 permits assembly of the two flapper portions ⁇ 44 and 46 and enables the fiapper 42 to be rigidly mounted on the plate.
- the two apper portions 44 and 46 are rectangular in cross-section adjacent their outer extremities and are provided with circular collars 54 and 56, respectively, at the inner extremities thereof.
- the circular collars. 54 and 56 define ⁇ a pair of flat circular end walls 58 and 60, respectively, and thus provide a pair 4vof bearing surfaces which engage faces 38 and 40,
- the plate- 36 with' apper ⁇ 42 mountedfthereon is seated'l with a recess' 62 formed in casing floo'r ⁇ 16l and isv thusl positioned betweenY casing chambersl 12 and 14. Being so positioned, plate 36 forms a wall between" the twochambersv 12 and 14 and prevents'the direct' ow of hydraulic' uid therebetween. With the plate 36 in this position, itwill also be noted that the lower portion 46 of the apper is positioned between the two orifices 30 and 32 while the upper portion 44 of. the dapper. extends upwardly intol casing chamber-12. l
- Casing' chamber 1' houses a magnetic circuiti motor. or powermeans'which vincludes a ma'gneticlmaterial plate or ⁇ shunt 64, with permanent magnet ⁇ 66, and an electrically energized coil 68.
- Shunt 64 isV mounted on top of plate"36 and is provided with a centrally disposed aperture 70 therein tov accommodate the' passage therethrough of iiapper portion 44.
- permanent magnet 66 has yone end seated in conductive l relationship with shunt 64 and at the opposite end is providedA with an open space o'r void 72 thereinwhich defines a pair of' opposite magnetic poles 74 and 76.
- the electrically energized' coil 68 is disposed around the flapper'portion 44 intermediate the ends thereof and being so positionedl pro'videsa short terminal end 78 on flapper portion 44 which is disposedvbetween the poles 74 and ⁇ 76 of the magnet 66.
- the upper iapper portion 44 thus becomesthe armature of the hydraulic transfer valve motor.
- casing 10 is provided with a passage 80 therein which connects the casing chambers 12 ⁇ and 14.
- Passage 80 permits uid flow in one direction only at any one time and prevents a continuous flow of fluid between the chambers. AsV a ⁇ practical matter, the flow of vad'between the chambers 12 and 14 will lcease When chamber 12 becomes lled'w'ith fluid.
- the prevention ofk a continuous or direct'flow of uid betweenV chambers 12 and 14 is particularly important from .the standpoint of preventing contamination ofthe fluid in chamber 12'. Since contaminants present in the hydrauliciiuid, notably ferrous particles, adversely eiect the functioning of the magnetic circuit motor, it becomes extremely important'to limit the flow of hydraulic uid between the chambers 12 and 14l so as to prevent a build-up or 'concentration of'contaminants in the magnetic ux within chamber 12.
- the fluid fiow ratev through orifices 30 and 32 will be a linear function of some characteristic of the input signal to the coil 68, for example, a characteristic such as the amplitude of the input signal.
- plate 36 In addition to preventing a direct flow of hydraulic fluid between casing chambers 12 and 14 and thus preventing contamination of the magnetic motor [circuit in and around permanent magnet 66 and coil 68, plate 36 also prevents' contamination of the magnetic motor c'i'rn cuit adjacent the orifices 30 and 32.
- the plate 36 forms an integral part of thel magnetic motor circuit since it is made of a magnetic-material and is juxtaposed the magnetic shunt 64. Because of the construction' and position of the plate 36, the intensity of the magnetic flux around orifices 30 and 32 is very low and, thus, the contamination of the hydraulic fluid around orifices 30 and 32 is negligible. It is particularly important to prevent contamination of the magnetic motor circuit around orificesv 30 and 32 since'the presence of contaminants in the hydraulic fluid at this point adversely effects the iiow control characteristics of the orifices.
- Figs. 6 and 7 show another embodiment of the dapper which may be used as a component part of the diaphragm-iapper assembly.
- the flapper comprises an' elongated rectangular-shaped bar 82 provided with an annular threaded portion 84 and an annular ange 86 intermediate the ends thereof.
- the flapper 82 in this embodiment is a one-piece construction which is adapted to be retained in assembled engagement with a ⁇ diaphragm (not shown) by threaded portion 84.
- a ow control device including a casing having a pair of chambers therein, magnetic means in one of said chambers producing a magnetic flux, and liuid passage means for pressurized fluid in another of said chambers, the combination of flexible means for preventing the passage of fluid between the chambers and for providing a component of a magnetic circuit for the magnetic ilux, and a member carried by said flexible means with a portion of the member extending into each of the said chambers, one portion of said member being cooperable with the magnetic means and the other portion thereof being positioned between the fluid passage means whereby one portion of said member is rotated relative to said ilexible means by the magnetic flux to move the other portion of said member between a plurality of controlling positions relative to the fluid passage means for controlling the passage of fluid therethrough, said magnetic circuit component providedv by said exible means being operative to reduce the intensity of the magnetic ilux in the chamber housing the uid passage means and thereby being operable to substantially eliminate the contamination of the fluid around the fluid passage means.
- a iiow control device including a casing having a pair of chambers therein connected by a flow passage with an electrically energizable coil and magnetic means in one of said chambers and iluid passage means in the other of said chambers, saidvmagnetic means producing a magnetic flux, the combinationl of a flexible plate for preventing the direct ow of fluid between the chambers and for providing a component of a magnetic'ux circuit, and a' member mounted on said plate with portions extending substantially laterally of said plate, one portion of said member being surrounded by the coil and juxtaposed the magnetic means and another portion of said member being positioned between the fluid passage means, said member rotated relative to said plate by the magnetic flux when the coil is energized to thereby move one portion of said member between a plurality of controlling positions relative to the fluid passage means to produce a pressure drop across the uid passage means.
- a fiow control device including a casing having a pair of chambers therein connected by a fiow passage with a two-pole magnet and an electrically energized coil in one of said chambers and a pair of orifices for pressurized fluid in the other of said chambers, characterized by a flexible diaphragm for preventing the direct flow of fluid between the chambers and for providing a component of a magnetic circuit for the magnetic iiux produced by the magnet, said diaphragm in preventing the direct fio-w of liud between the chambers thereby being operative to prevent the contamination of the fluid in the magnetic circuit in the chamber housing the magnet and the coil, and a iiapper rigidly mounted on said diaphragm with portions thereof extending substantially laterally of the said diaphragm, one portion of said flapper being surrouned by the coil and positioned between the poles of the magnet and another portion of said rflapper being positioned between the pair of orifices, one portion of said flapper
- said flapper is comprised of an elongated bar provided with an annular flange and an annular threadedportion intermediate the ends thereof.
- a iiow control device having a pair of chambers therein and provided with a plurality of orifices in one of said chambers for pressurized fluid, a flexible plate positioned between said chambers for preventing the ow of fluid therebetween, a relatively iniiexible member mounted on said plate and having a portion thereof projecting into each of said chambers, a magnetic circuit motor operatively associated with said member relative to said plate whereby one portion of said member is moved between a plurality of controlling positions relative to said orifices to control the passage of fluid therethrough, and means to equalize the tiuid pressures in both of said chambers, said magnetic-material plate comprising a part of said magnetic circuit motor and thereby being operative to prevent contamination of the fluid around said orifices by reducing the intensity of the magnetic flux around said orifices.
- a flow control device having a pair of chambers therein and provided with a pair of orifices in one of said chambers for pressurized fluid, a magnetic-material plate separating said pair of chambers and preventing the ow of viiuid therebetween, a member carried by said plate and having portions thereof projecting into each of said chambers, and magnetic means in one of said chambers including a magnetic circuit operatively associated with one portion of said member for rotating said member and moving another portion of said member between a plurality of controlling positions relative to said orifices for producing a uid pressure drop across said orifices, said magnetic-material plate forming ⁇ a component of said magnetic circuit and thereby being operative to prevent contamination of the fluid around said orifices by reducing the intensity of the magnetic flux around said orifices.
- a fiow control device having a pair of chambers therein and provided with a pair of orifices in one of said chambers for pressurized fluid, a flexible magneticmaterial plate positioned between said chambers for preventing the iiow of uid therebetween, a magnetic-material member mounted on said plate and having a portion thereof projecting into each of said chambers, means to equalize the uid pressure in said chambers, a two-pole magnet and an electrically energizable coil in the other of said chambers, one portion of said member having a part thereof surounded by said coil and having a part thereof positioned between the poles of said magnet, and a magnetic iiux circuit operatively associated with one portion of said member for rotating said member when said coil is energized and moving the other portion of said member between a plurality of controlling positions relative to said orifices to produce a fluid pressure drop across said orifices, said magnetic-material plate also forming a part of said magnetic flux circuit and thereby being operative to
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Coating Apparatus (AREA)
- Control Of Fluid Pressure (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DENDAT1069972D DE1069972B (de) | 1957-01-30 | ||
US63718357 US2915077A (en) | 1957-01-30 | 1957-01-30 | Diaphragm-flapper assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US63718357 US2915077A (en) | 1957-01-30 | 1957-01-30 | Diaphragm-flapper assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
US2915077A true US2915077A (en) | 1959-12-01 |
Family
ID=24554908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US63718357 Expired - Lifetime US2915077A (en) | 1957-01-30 | 1957-01-30 | Diaphragm-flapper assembly |
Country Status (2)
Country | Link |
---|---|
US (1) | US2915077A (de) |
DE (1) | DE1069972B (de) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2977985A (en) * | 1958-12-29 | 1961-04-04 | Pegasus Lab Inc | Electro-hydraulic servo control valve |
US3050034A (en) * | 1960-04-04 | 1962-08-21 | Ct Circuits Inc | Transducer-controlled servomechanism |
US3086553A (en) * | 1960-06-24 | 1963-04-23 | Gerald A Levine | Two-stage, two-fluid, uni-directional control valve |
DE1195116B (de) * | 1959-08-31 | 1965-06-16 | Borg Warner | Steuereinrichtung fuer einen doppeltwirkenden Verbraucher mit einem Kolbenschieber |
DE1650600B1 (de) * | 1966-10-31 | 1970-01-22 | Weston Hydraulics Ltd | Elektrohydraulisches Servoventil |
US4252651A (en) * | 1979-08-29 | 1981-02-24 | Baxter Travenol Laboratories, Inc. | Negative pressure valving system and transmembrane pressure alarm system |
EP0177944A2 (de) * | 1984-10-12 | 1986-04-16 | H. Kuhnke GmbH KG | Bistabiles Magnetventil |
US4754690A (en) * | 1986-09-19 | 1988-07-05 | Allied-Signal Inc. | Electrically controlled hydraulically driven actuator assembly |
US20120216896A1 (en) * | 2008-08-08 | 2012-08-30 | Mitsubishi Heavy Industries, Ltd. | Servo valve |
US20190048900A1 (en) * | 2017-08-12 | 2019-02-14 | Hamilton Sundstrand Corporation | Pneumatic servovalve assembly |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1235092B (de) * | 1960-01-29 | 1967-02-23 | Elektroteile G M B H | Elektromagnetisch betaetigtes Steuerventil |
FR1258366A (fr) * | 1960-03-02 | 1961-04-14 | Rech Etudes Production Sarl | étage primaire à palette et tube de torsion pour distributeur hydraulique à deux étages |
DE1268921B (de) * | 1965-12-30 | 1968-05-22 | Zd Y Pruumyslove Automatizace | Steuerglied der Duesensteuerung bei hydraulischen Regelschiebern |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1920764A (en) * | 1933-08-01 | nickle | ||
US2526804A (en) * | 1945-03-06 | 1950-10-24 | Carpenter Rupert Evan Howard | Electrical contact assembly |
US2767689A (en) * | 1953-05-22 | 1956-10-23 | Cornell Aeronautical Labor Inc | Electrohydraulic servo valve |
US2775254A (en) * | 1951-09-05 | 1956-12-25 | British Messier Ltd | Electromagnetic devices for controlling fluid pressure |
US2790427A (en) * | 1955-09-23 | 1957-04-30 | Ex Cell O Corp | Flow control servo valve |
US2806480A (en) * | 1954-09-01 | 1957-09-17 | Foxboro Co | Differential pressure responsive apparatus |
-
0
- DE DENDAT1069972D patent/DE1069972B/de active Pending
-
1957
- 1957-01-30 US US63718357 patent/US2915077A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1920764A (en) * | 1933-08-01 | nickle | ||
US2526804A (en) * | 1945-03-06 | 1950-10-24 | Carpenter Rupert Evan Howard | Electrical contact assembly |
US2775254A (en) * | 1951-09-05 | 1956-12-25 | British Messier Ltd | Electromagnetic devices for controlling fluid pressure |
US2767689A (en) * | 1953-05-22 | 1956-10-23 | Cornell Aeronautical Labor Inc | Electrohydraulic servo valve |
US2806480A (en) * | 1954-09-01 | 1957-09-17 | Foxboro Co | Differential pressure responsive apparatus |
US2790427A (en) * | 1955-09-23 | 1957-04-30 | Ex Cell O Corp | Flow control servo valve |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2977985A (en) * | 1958-12-29 | 1961-04-04 | Pegasus Lab Inc | Electro-hydraulic servo control valve |
DE1195116B (de) * | 1959-08-31 | 1965-06-16 | Borg Warner | Steuereinrichtung fuer einen doppeltwirkenden Verbraucher mit einem Kolbenschieber |
US3050034A (en) * | 1960-04-04 | 1962-08-21 | Ct Circuits Inc | Transducer-controlled servomechanism |
US3086553A (en) * | 1960-06-24 | 1963-04-23 | Gerald A Levine | Two-stage, two-fluid, uni-directional control valve |
DE1650600B1 (de) * | 1966-10-31 | 1970-01-22 | Weston Hydraulics Ltd | Elektrohydraulisches Servoventil |
US4252651A (en) * | 1979-08-29 | 1981-02-24 | Baxter Travenol Laboratories, Inc. | Negative pressure valving system and transmembrane pressure alarm system |
EP0177944A2 (de) * | 1984-10-12 | 1986-04-16 | H. Kuhnke GmbH KG | Bistabiles Magnetventil |
EP0177944A3 (de) * | 1984-10-12 | 1987-06-24 | H. Kuhnke GmbH KG | Bistabiles Magnetventil |
US4754690A (en) * | 1986-09-19 | 1988-07-05 | Allied-Signal Inc. | Electrically controlled hydraulically driven actuator assembly |
US20120216896A1 (en) * | 2008-08-08 | 2012-08-30 | Mitsubishi Heavy Industries, Ltd. | Servo valve |
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 |
Also Published As
Publication number | Publication date |
---|---|
DE1069972B (de) | 1959-11-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2915077A (en) | Diaphragm-flapper assembly | |
US4513780A (en) | Solenoid valve | |
US4102526A (en) | Solenoid valve | |
US3069846A (en) | Thrust device | |
US2964286A (en) | Solenoid-operated valve mechanism | |
DE3479602D1 (en) | Proportional solenoid valve | |
US2962611A (en) | Electromagnetic actuator | |
US3401711A (en) | Single receiver port jet displacement servovalve | |
US3228423A (en) | Fluid control valve in which a mechanical motion is transmitted from a dry region to a pressurized fluid filled region | |
US4299374A (en) | Solenoid valve | |
US4585029A (en) | Electro-hydraulic servo valve | |
US3378031A (en) | Reversible solenoid-operated valve assembly | |
US3058038A (en) | Torque motor with null balance | |
US4846439A (en) | Electromagnetic valve assembly | |
US2962002A (en) | Two-stage hydraulic servo valve | |
US3331393A (en) | Digital valve | |
WO1990015742A3 (en) | Solenoid valve | |
US4368750A (en) | Ball-type feedback motor for servovalves | |
US3180346A (en) | Fluid flow control stage | |
US3117585A (en) | Electro-hydraulic control valve | |
US20020066480A1 (en) | Pilot stage or pressure control pilot valve having a single armature/flapper | |
US3176593A (en) | Pressure responsive servo valve | |
US3054388A (en) | Servo valve with flow rate feedback | |
US3473548A (en) | Electrohydraulic servo mechanism | |
US3537467A (en) | Flapper servo valve with feedback |