US3792715A - Single seat holding valve - Google Patents
Single seat holding valve Download PDFInfo
- Publication number
- US3792715A US3792715A US00344593A US3792715DA US3792715A US 3792715 A US3792715 A US 3792715A US 00344593 A US00344593 A US 00344593A US 3792715D A US3792715D A US 3792715DA US 3792715 A US3792715 A US 3792715A
- Authority
- US
- United States
- Prior art keywords
- valve
- port means
- poppet valve
- holding
- poppet
- 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
- 239000012530 fluid Substances 0.000 claims abstract description 42
- 230000007935 neutral effect Effects 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
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
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/52—Pressure control characterised by the type of actuation
- F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/75—Control of speed of the output member
-
- 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
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7771—Bi-directional flow valves
-
- 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
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7781—With separate connected fluid reactor surface
- Y10T137/7834—Valve seat or external sleeve moves to open valve
-
- 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
- Y10T137/87169—Supply and exhaust
- Y10T137/87233—Biased exhaust valve
- Y10T137/87241—Biased closed
Definitions
- a holding valve for regulating the exhaust flow of fluid from a hydraulic actuator including a cartridge defining a first port adapted to be connected to a directional control valve, a second port adapted to be connected to one side of the hydraulic actuator and a third port adapted to be connected to the other side of the hydraulic actuator, there being provided a pilot operated poppet valve that closes in opposition to fluid pressure in the actuator through the second port to control exhaust flow from the actuator and also to prevent exhaust flow when the directional valve is in neutral, there also beingprovided a check valve surrounding the poppet valve for the purpose of permitting the free flow of line pressure from the first port to the second port and the hydraulic actuator, with this check valve being annular in configuration, surrounding the poppet valve and having a shoulder defining the seat for the poppet valve to improve the characteristics of the holding valve and also to permit the simple replacement of the main poppet valve seat when necessary.
- Pilot operated holding valves have been provided in the past for regulating the exhaust flow from a hydraulic actuator.
- the primary purpose of these holding valves is to control the lowering of a load connected to the hydraulic actuator.
- the poppet valve controls exhaust flow from the other side of the actuator, so that if the load tends to overrun, the pressure in the load lowering side of the actuator will drop, reducing pilot pressure which in turn tends to close the main poppet valve and restrict the exhaust flow from the actuator and reduce the speed of load lowering to a controlled condition.
- an improved holding valve in which the main valve seat may be easily replaced and in which the various areas that control the valve characteristics may be easily changed to control the performance of the valve in a simpler manner than prior art constructions.
- a counter-balance holding valve having a cartridge sleeve defining a first port communicating with a directional control valve, a second port connected to one side of the hydraulic actuator and a third port connected to the other side of the hydraulic actuator. Disposed within this sleeve is a pilot operated main poppet valve that controls and regulates flow from the second port to the first port to control the lowering of the load connected to the hydraulic actuator. This main poppet valve also serves to hold the load in position by preventing flow from the second port to the first port when the directional control valve is in neutral.
- a check valve is provided that is annular in configuration, slidable in the cartridge sleeve, and surrounding the main poppet valve.
- This check valve has the novel characteristic that its internal bore defines a seat for the main poppet valve. In this manner when deterioration of the poppet valve seat occurs it is merely necessary to replace the inexpensive check valve, since it also defines the seat for the main poppet valve.
- the term percentage characteristic refers to the sensitivity of the poppet valve in response to variations in pilot pressure acting on the poppet valve and is equal to the area of the poppet valve against which cylinder pressure acts divided by the area of the poppet valve against which pilot pressure acts.
- a higher pilot piston area relative to the cylinder pressure area referred to means that a lower pilot pressure is required to open the main poppet valve and hence the valve has an increased sensitivity.
- This percentage characteristic can be easily varied in the present holding valve since the area of the poppet valve against which cylinder pressure acts may be made either positive, balanced or even negative if desired, and the pilot piston area may also be easily varied as desired.
- a further advantage in the present invention is that fluid flow passing through the valve in either direction does not pass through the coils of either the poppet valve spring or the spring urging the check valve closed.
- thermal relief valve may be easily provided and the main counterbalance spring may be adjusted as desired.
- FIG. 1 is a plan view of the cartridge holding valve according to the present invention.
- FIG. 2 is an enlarged longitudinal section of the holding valve shown in FIG. 1 taken generally along line 22 thereof illustrated in conjunction with a typical fluid actuator circuit shown schematically;
- FIG. 3 is a longitudinal section of a somewhat modified form of the holding valve illustrated in FIG. 1 and 2.
- FIGS. 1 and 2 a cartridge type holding valve 10 is illustrated in circuit with a 4-way directional control valve 12 and a reciprocating piston hydraulic actuator 14 shown schematically in FIG. 2. v
- the 4-way control valve 12 selectively ports fluid from a supply line 16 to line 18 to the right side 20 of actuator 14 which drives piston 21 in what may be assumed to be a load lowering direction, or to line 23 through holding valve 10 to line 24 connected to the left side 26 of actuator 14 to drive the piston 21 in what may be assumed to be a load raising direction.
- the primary purpose of the holding valve 10 is to control the speed of piston 21 when moving in a load lowering direction to control the smooth lowering of the load connected to the piston 21.
- Holding valve 10 also serves to lock the piston 21 in position when the directional control valve 12 is in its neutral position.
- the holding valve 10 includes a stepped cylindrical cartridge sleeve 30 seated within a stepped counterbore 31 in valve housing 32 and threaded therein as seen at 34.
- Sleeve 30 has a hexagonal head portion 35 projecting from the housing 32 and sealed thereto with a sealing ring 36.
- the sleeve has lands 39 and 40 that define recesses for seal assemblies 42 and 43 in turn defining annular recesses 46, 47 and 48 around the periphery of the sleeve 30 within the housing 32.
- the sleeve 30 has a first annular array of ports 50 communicating across recess 46 with housing port 48 connected to fluid supply and return line 23.
- the sleeve 30 has a second annular array of ports 50 communicating across recess 37 with housingport 52 connected to receive and deliver fluid relative to line 24 connected to actuator 14.
- the sleeve 30 has a reduced annular end portion 55 that is spaced from the end of counterbore 31 defining a flow passage 56 which communicates across recess 48 with a port 58 in the housing 32 that communicates with a pilot pressure line 60 having a restrictor 61 therein.
- Line 60 communicates with line 18 that delivers fluid to the right side 20 of cylinder 14.
- the sleeve 30 has threaded therein a hollow sleeve cap 62 having a'hexagonal head portion 63 for the pur-- pose of threading the sleeve 62 within the sleeve 30 as indicated at 65.
- the cartridge sleeve 30 has a first counterbore por tion 67 communicating with port 50, and a somewhat reduced counterbore 68 communicating with a further reduced counterbore 70 in turn communicating with port 50'.
- a still further smaller bore portion 73 in turn communicates with a somewhat larger bore 75 opening to the right end of the sleeve 30 and communicating with passage 56 defined in the housing bore 31.
- a poppet valve assembly 77 Slidable within the stepped bore cartridge sleeve 30 is a poppet valve assembly 77 having a semi-spherical valving surface 78 at the left end thereof defining with stub shaft 79 a seat for the right end of a heavy duty counter balance spring 82 that urges the poppet valve 77 closed in opposition to fluid pressure in actuator chamber 26 as sensed through ports 52 and 50.
- the spring 82 is adjustable through spring seat 85 and threaded member 87 threadedly engaged in sleeve cap 63 and held in position by a locking nut 89.
- poppet valve 77 The purpose of poppet valve 77 is to control flow between port 52 and port 48,.or more specifically between ports 50' and 50 in the sleeve 30 to regulate flow from the actuator chamber 26.
- valve 77 has a reduced stem portion 91 connected to a somewhat enlarged head 92 having a seal 93 slidable in cartridge bore 73, in turn connected to an enlarged pilot piston 95 having a sealing ring 96.
- valve member 77 Rightward movement of the valve member 77 is limited by a snap ring 98 seated within counterbore 75 in the cartridge sleeve 30.
- Thecounterbalance valve 77 has a modulating action to control the exhausting of fluid from the return side 26 of the actuator to provide smooth load lowering movement.
- a sleeve check valve 101 is provided having a counterbore that receives a biasing spring 102 that biases the check valve 101 into engagement with the valve surface 78 of the main poppet valve 77.
- a re Jerusalem interior shoulder 105 on the check valve defines a floating seat for-the main poppet valve 77.
- the check valve 101 will move slightly to the left therewith holding the main poppet valve orifice closed until the check valve hits shoulder 107 on the sleeve 62 stopping the check valve. Thereafter the poppet valve 77 continues its movement to the left under the influence 'of pilot pressure on piston 95 opening the poppet valve when the right side of the actuator 14 is pressurized.
- the poppet valve 77 has an aperture 110 extending centrally therethrough that permits the left side 112 of the pilot piston to drain into the cavity defined by bore 67 within the cartridge sleeve.
- Diameter D equaling the diameter of the main poppet seat is made as small as possible so that the area of the orifice does not change significantly as the poppet valve opens.
- diameter D1 may also be easily varied which in conjunction with D determines the effective area of thepoppet valve 77 upon which pressure in actuator chamber 26 acts.
- diameter D slightly greater than diameter D the net pressure acting on the valve member 77 from cylinder pressure is in a positive direction or to the left.
- the pressure in the actuator acting on valve 77 may be equal merely by making the area D, equal to the area D, And moreover the net cylinder force acting on the valve member 77 can be negative by making the area defined by diameter D greater than the area defined by diameter D, so that cylinder pressure tends to close the poppet valve 77.
- pilot area defined by pilot diameter D may be selected as desired.
- the percentage characteristic is defined as the effective area upon which cylinder pressure acts on the poppet valve divided by the area of the poppet valve upon which pilot pressure acts.
- a higher percentage characteristic means that a higher pilot pressure will be required to fully open the valve than with a low percentagecharacteristic.
- FIG. 3 A somewhat modified form of the present invention is illustrated in FIG. 3 wherein a holding valve 110 is seen to include a housing 112 having a threaded cartridge sleeve 113 defining a stepped bore 114 receiving a poppet valve 116 having a valve surface portion 117 at its left end and pilot piston 118 at its right end. Ports 120, 121, and flow passage 122 are adapted to be connected to the directional control valve, one side of the hydraulic actuator, and the other side of the hydraulic actuator, respectively, as in the embodiment shown in FIGS. 1 and 2.
- a movable check valve 130 defines a movable seat 132 for the main poppet valve 116 as in FIGS. 1 and 2 embodiment.
- pilot piston 118 also defines one of the diameters for determining the effective area of the poppet valve 116 upon which cylinder pressure acts through ports 121. Moreover plunger 136 limits the opening movement of the poppet valve 116, while shoulder 138 within the cartridge limits the movement of the poppet valve 116 to the right towards its closed position.
- valve shown in FIG. 3 operates in substantially the same manner as the valve shown in FIGS. 1 and 2 so that detailed description thereof is not believed necessary.
- a holding valve assembly for controlling flow between a flow control valve and a fluid actuator, comprising; first port means adapted to be connected to receive and deliver fluid relative to the flow control valve, second port means adapted to be connected to receive and deliver fluid relative to one side of the actuator, third port means adapted to be connected to the other side of the fluid actuator, a check valve for permitting flow from the first port means to the second port means and preventing flow from the second port means to the first port means, and a poppet valve member actuated by fluid pressure in said third port means for permitting flow from said second port means to said first port means, said check valve defining a valve seat for said poppet valve.
- a holding valve assembly for controlling flow between 2 flow control valve and a fluid actuator, com prising; a valve bore, first port means communicating with said valve bore and adapted to be connected to the flow control valve, second port means communicating with said bore and adapted to be connected to one side of the actuator, third port means communicating with said bore and adapted to be connected with the other side of the actuator, a sleeve shaped check valve slidable in said bore for preventing flow from said second port means to said first port means and permitting flow from said first port means to said second port means, said sleeve shaped check valve having an inside shoulder defining a movable valve seat, a stop within said bore for limiting movement of sleeve shaped check valve, a spring in said bore biasing said check valve toward said stop, a poppet valve in said bore actuated by fluid pressure in said third port means for selectively preventing fluid flow from said second port means to said first port means or permitting fluid flow from said second port means to said first port means, said poppet valve being seated on
- a holding valve assembly as defined in claim 8, wherein said bore is defined by a cartridge sleeve.
- a holding valve assembly as defined in claim 8, including a pilot piston at the end of the poppet valve slidable in an enlarged counterbore in said valve bore.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Fluid Pressure (AREA)
- Fluid-Pressure Circuits (AREA)
- Check Valves (AREA)
Abstract
Description
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US34459373A | 1973-03-26 | 1973-03-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3792715A true US3792715A (en) | 1974-02-19 |
Family
ID=23351179
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00344593A Expired - Lifetime US3792715A (en) | 1973-03-26 | 1973-03-26 | Single seat holding valve |
Country Status (2)
Country | Link |
---|---|
US (1) | US3792715A (en) |
JP (1) | JPS49122029A (en) |
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3942550A (en) * | 1974-08-02 | 1976-03-09 | The Bendix Corporation | Dual-acting relief valve |
US3943968A (en) * | 1975-01-06 | 1976-03-16 | Parker-Hannifin Corporation | Combination lock and relief valve for hydraulic systems |
US3981479A (en) * | 1974-06-14 | 1976-09-21 | Snap-Tite, Inc. | Check valve |
DE2559029A1 (en) * | 1975-12-29 | 1977-07-07 | Heilmeier & Weinlein | Brake valve for limiting fluid pressure - has opposing valve bodies of pressure limiting and nonreturn valves |
FR2469597A1 (en) * | 1979-11-09 | 1981-05-22 | Bennes Marrel | Hydraulic cylinder brake valve |
WO1981003208A1 (en) * | 1980-05-01 | 1981-11-12 | Boeing Co | Integral hydraulic blocking and relief valve |
EP0043090A1 (en) * | 1980-06-26 | 1982-01-06 | Udo Leikauf | Piloted 3/2-directional lift valve |
US4336826A (en) * | 1980-05-02 | 1982-06-29 | Fluid Controls, Inc. | Control valve |
US4342256A (en) * | 1976-09-21 | 1982-08-03 | Danfoss, A/S | Control device for a hydraulic motor |
US4346733A (en) * | 1980-07-29 | 1982-08-31 | Fluid Controls, Inc. | Control valve |
US4461449A (en) * | 1980-05-01 | 1984-07-24 | The Boeing Company | Integral hydraulic blocking and relief valve |
US4470339A (en) * | 1979-11-09 | 1984-09-11 | Bennes Marrel | Braking valve for hydraulic circuits |
FR2559853A1 (en) * | 1984-02-22 | 1985-08-23 | Sperry Vickers Division Sperry | HIGH PRESSURE HYDRAULIC DISPENSER WITH MECHANICALLY PILOT DISCHARGE VALVE |
US4667570A (en) * | 1984-12-21 | 1987-05-26 | The Boeing Company | Integral hydraulic blocking and relief valve |
US4838532A (en) * | 1987-08-10 | 1989-06-13 | Aladdin Engineering & Mfg., Inc. | Fluid operated clamping device including fluid pressure locking means |
EP0464305A1 (en) * | 1990-07-05 | 1992-01-08 | HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG | Hydraulic control device |
US5081904A (en) * | 1989-08-30 | 1992-01-21 | Aladdin Engineering & Mfg., Inc. | Locking valve and flow control valve assembly |
US5174189A (en) * | 1988-06-08 | 1992-12-29 | Teijin Seiki Co., Ltd. | Fluid control apparatus |
US5309936A (en) * | 1993-04-30 | 1994-05-10 | Dana Corporation | Poppet configuration for counterbalance valve |
WO1994016258A1 (en) * | 1993-01-11 | 1994-07-21 | Snap-Tite, Inc. | Hydraulic coupling |
US5381822A (en) * | 1993-11-26 | 1995-01-17 | Dana Corporation | Relief valve with hydraulic fuse |
US5960814A (en) * | 1997-09-12 | 1999-10-05 | Ngt, Llc. | Counter balanced locking valve |
US6131610A (en) * | 1996-11-22 | 2000-10-17 | Smc Kabushiki Kaisha | Speed controller with pilot check valve |
US6131606A (en) * | 1999-06-21 | 2000-10-17 | Caterpillar Inc. | Moving check valve seat providing high pressure relief |
US6477937B1 (en) | 1999-12-13 | 2002-11-12 | Aladdin Engineering & Manufacturing | Valve arrangement including release valve |
US6520342B1 (en) | 2000-02-16 | 2003-02-18 | Aladdin Engineering & Manufacturing, Inc. | Product handling apparatus |
US20080173264A1 (en) * | 2006-10-11 | 2008-07-24 | Gm Global Technology Operations, Inc. | Drive piston assembly for a valve actuator assembly |
US20100059125A1 (en) * | 2008-08-28 | 2010-03-11 | Kot Norbert J | Balanced pilot operated check valve |
US20100090143A1 (en) * | 2008-08-28 | 2010-04-15 | Kot Norbert J | Dual locking valve |
US20130019967A1 (en) * | 2007-05-23 | 2013-01-24 | Brown Albert W | Mechanical function control of continuously variable transmission hydraulic system |
US20160097462A1 (en) * | 2014-10-01 | 2016-04-07 | Nabtesco Corporation | Hydraulic valve |
US20160098045A1 (en) * | 2014-10-01 | 2016-04-07 | Nabtesco Corporation | Aircraft hydraulic valve |
US9611871B2 (en) | 2013-09-13 | 2017-04-04 | Norbert J. Kot | Pneumatic valve assembly and method |
US10113511B2 (en) * | 2014-05-05 | 2018-10-30 | Parker-Hannifin Corporation | Pressure regulator |
US20190195384A1 (en) * | 2017-12-25 | 2019-06-27 | Nabtesco Corporation | Fluid valve and opening motion promoting device |
US20190360603A1 (en) * | 2018-05-22 | 2019-11-28 | Nabtesco Corporation | Fluid pressure valve |
US20200248827A1 (en) * | 2019-01-31 | 2020-08-06 | Scott Dale Follett | Pressure relief valve |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US761651A (en) * | 1903-10-16 | 1904-06-07 | New York Air Brake Co | Air-brake. |
US2424331A (en) * | 1943-09-20 | 1947-07-22 | Alco Valve Co | Brake valve |
US3011506A (en) * | 1958-02-03 | 1961-12-05 | Wagner Electric Corp | Control valve |
-
1973
- 1973-03-26 US US00344593A patent/US3792715A/en not_active Expired - Lifetime
-
1974
- 1974-02-19 JP JP49019164A patent/JPS49122029A/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US761651A (en) * | 1903-10-16 | 1904-06-07 | New York Air Brake Co | Air-brake. |
US2424331A (en) * | 1943-09-20 | 1947-07-22 | Alco Valve Co | Brake valve |
US3011506A (en) * | 1958-02-03 | 1961-12-05 | Wagner Electric Corp | Control valve |
Cited By (51)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3981479A (en) * | 1974-06-14 | 1976-09-21 | Snap-Tite, Inc. | Check valve |
US3942550A (en) * | 1974-08-02 | 1976-03-09 | The Bendix Corporation | Dual-acting relief valve |
US3943968A (en) * | 1975-01-06 | 1976-03-16 | Parker-Hannifin Corporation | Combination lock and relief valve for hydraulic systems |
DE2559029A1 (en) * | 1975-12-29 | 1977-07-07 | Heilmeier & Weinlein | Brake valve for limiting fluid pressure - has opposing valve bodies of pressure limiting and nonreturn valves |
US4342256A (en) * | 1976-09-21 | 1982-08-03 | Danfoss, A/S | Control device for a hydraulic motor |
FR2469597A1 (en) * | 1979-11-09 | 1981-05-22 | Bennes Marrel | Hydraulic cylinder brake valve |
US4470339A (en) * | 1979-11-09 | 1984-09-11 | Bennes Marrel | Braking valve for hydraulic circuits |
WO1981003208A1 (en) * | 1980-05-01 | 1981-11-12 | Boeing Co | Integral hydraulic blocking and relief valve |
US4461449A (en) * | 1980-05-01 | 1984-07-24 | The Boeing Company | Integral hydraulic blocking and relief valve |
US4336826A (en) * | 1980-05-02 | 1982-06-29 | Fluid Controls, Inc. | Control valve |
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