GB1477369A - Directional control valve - Google Patents

Directional control valve

Info

Publication number
GB1477369A
GB1477369A GB3442374A GB3442374A GB1477369A GB 1477369 A GB1477369 A GB 1477369A GB 3442374 A GB3442374 A GB 3442374A GB 3442374 A GB3442374 A GB 3442374A GB 1477369 A GB1477369 A GB 1477369A
Authority
GB
United Kingdom
Prior art keywords
pressure
spool
chamber
valve
acts
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
Application number
GB3442374A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Parker Hannifin Corp
Original Assignee
Parker Hannifin Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Parker Hannifin Corp filed Critical Parker Hannifin Corp
Publication of GB1477369A publication Critical patent/GB1477369A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • 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
    • F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
    • F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation valves

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid Mechanics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

1477369 Fluid-pressure servomotor systems PARKER HANNIFIN CORP 5 Aug 1974 [6 Sept 1973] 34423/74 Heading G3P [Also in Division F2] A pressure compensated directional control valve comprises a spool 27 for inter-connecting one of the work ports 101' to a supply passage 104 while inter-connecting the other work port with one of the exhaust passages 16'. High-pressure fluid H1-S is supplied through a variable orifice 107 formed by movement of the spool 27 and a pressure compensating spool 28, the opposite ends of which are respectively supplied with fluid from upstream and downstream of the variable orifice 107, provides an additional restriction at 114 in the supply to maintain the flow demand set by the variable orifice 107 and acts as a load check-valve upstream of the orifice 107. A spring-biased pilot relief valve 116 on excess pressure downstream of the orifice 107 vents the end chamber 112 so that supply pressure H1-S in chamber 110 can move the spool 28 to the right to shut-off flow to the orifice 107. In a control for a variable displacement pump, Fig. 6, the output from the pump at 122 is communicated to chamber 129 via a restriction 144 and acts on a spool 123 to control flow through ports 151 to a port 150 and via a secondary spool 127 to directional control valves and to control flow to pump inlet chamber 146 through ports 145, 173. The pressure in chamber 129, which acts on piston 125 to alter the angle of the swashplate 120, is thus controlled by the spool 123 and is also controlled by the secondary spool 127 which acts to connect chamber 129 to pump inlet 139 through ports 147, 137 according to the pressure differential across the variable orifices of the directional control valves which pressure differential is communicated to the ends of the spool 127. In a pressure relief valve (29), Fig. 2 (not shown) a spring-loaded pilot valve (37) acts to vent the space (36) on excess pressure to allow the valve-member (39) to open, the restriction (38) communicating the supply port (12') with the space (36). Further directional control valves with corresponding compensating valves, and an unloader valve are described and together the valves form a device for operating piston-cylinders on a fork-lift truck.
GB3442374A 1973-09-06 1974-08-05 Directional control valve Expired GB1477369A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US394560A US3866419A (en) 1973-09-06 1973-09-06 Integrated pressure compensated load sensing system

Publications (1)

Publication Number Publication Date
GB1477369A true GB1477369A (en) 1977-06-22

Family

ID=23559468

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3442374A Expired GB1477369A (en) 1973-09-06 1974-08-05 Directional control valve

Country Status (3)

Country Link
US (1) US3866419A (en)
JP (1) JPS5054779A (en)
GB (1) GB1477369A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2149889A (en) * 1980-08-13 1985-06-19 Commercial Shearing A combination check and relief valve
CN108506267A (en) * 2018-05-02 2018-09-07 宁波真格液压科技有限公司 A kind of loop choice valve with decompression function

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093092A (en) * 1976-03-24 1978-06-06 Caterpillar Tractor Co. Load limiting device
US4093091A (en) * 1976-06-30 1978-06-06 Towmotor Corporation Load moment sensing system for lift trucks
US4170246A (en) * 1977-05-23 1979-10-09 Sta-Rite Industries, Inc. Pilot operator valve
US4411189A (en) * 1977-07-18 1983-10-25 The Scott And Fetzer Company Fluid flow controlling device
US4142841A (en) * 1977-08-31 1979-03-06 Parker-Hannifin Corporation Variable displacement pump control
DE3106226C2 (en) * 1981-02-19 1986-01-09 Komatsu Forklift K.K., Tokio/Tokyo Control for forklifts
JPS60110400U (en) * 1983-12-27 1985-07-26 株式会社豊田自動織機製作所 Container spreader control valve
US20070227135A1 (en) * 2006-03-30 2007-10-04 Caterpillar Inc. Integrated load-sensing hydraulic system
US8647075B2 (en) * 2009-03-18 2014-02-11 Eaton Corporation Control valve for a variable displacement pump
DE102010048068B4 (en) 2010-04-16 2022-11-10 Robert Bosch Gmbh valve assembly
JP6338428B2 (en) * 2014-04-11 2018-06-06 Ｋｙｂ株式会社 Valve structure
CN104088841B (en) * 2014-06-26 2017-02-15 徐州徐工液压件有限公司 Load sensitive hydraulic system and load sensitive valve thereof
EP3093504B1 (en) * 2015-05-12 2019-08-21 HAWE Hydraulik SE Pressure controlled two-way flow control valve for hydraulics applications and valve assembly with a corresponding two-way flow control valve
US9752597B2 (en) * 2015-09-15 2017-09-05 Husco International, Inc. Metered fluid source connection to downstream functions in PCLS systems
US11293461B2 (en) 2019-10-25 2022-04-05 Tonand Inc. Cylinder on demand hydraulic device
US11118611B2 (en) 2019-10-25 2021-09-14 Tonand Inc. Cylinder on demand hydraulic device
IT202100009830A1 (en) * 2021-04-19 2022-10-19 Walvoil Spa HYDRAULIC DISTRIBUTOR WITH COMPENSATING DEVICE FOR DIRECTIONAL VALVES

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2238060A (en) * 1938-02-08 1941-04-15 Manly Corp Fluid pressure feed and rapid traverse system of transmission of power
US3366064A (en) * 1965-03-10 1968-01-30 Borg Warner Control for hydraulic apparatus
US3444689A (en) * 1967-02-02 1969-05-20 Weatherhead Co Differential pressure compensator control
US3470694A (en) * 1968-04-30 1969-10-07 Weatherhead Co Flow proportional valve for load responsive system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2149889A (en) * 1980-08-13 1985-06-19 Commercial Shearing A combination check and relief valve
CN108506267A (en) * 2018-05-02 2018-09-07 宁波真格液压科技有限公司 A kind of loop choice valve with decompression function
CN108506267B (en) * 2018-05-02 2019-11-26 宁波真格液压科技有限公司 A kind of loop choice valve with decompression function

Also Published As

Publication number Publication date
JPS5054779A (en) 1975-05-14
US3866419A (en) 1975-02-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee