GB1452609A - Hydraulic systems - Google Patents

Hydraulic systems

Info

Publication number
GB1452609A
GB1452609A GB2295073A GB2295073A GB1452609A GB 1452609 A GB1452609 A GB 1452609A GB 2295073 A GB2295073 A GB 2295073A GB 2295073 A GB2295073 A GB 2295073A GB 1452609 A GB1452609 A GB 1452609A
Authority
GB
United Kingdom
Prior art keywords
valve
pressure
load
service
compensator
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
GB2295073A
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.)
Unisys Group Services Ltd
Original Assignee
Sperry Rand Ltd
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 Sperry Rand Ltd filed Critical Sperry Rand Ltd
Priority to GB2295073A priority Critical patent/GB1452609A/en
Priority to US467082A priority patent/US3903786A/en
Priority to IT22699/74A priority patent/IT1012352B/en
Priority to DE2423595A priority patent/DE2423595C2/en
Priority to FR7416830A priority patent/FR2229878B1/fr
Publication of GB1452609A publication Critical patent/GB1452609A/en
Expired legal-status Critical Current

Links

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
    • F15B13/0416—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

Abstract

1452609 Hydraulic control circuits SPERRY RAND Ltd 29 April 1974 [15 May 1973] 22950/73 Heading F1P [Also in Division F2] In the circuit shown, Fig.1, in which a valve 1 controls supply and exhaust of hydraulic liquid to and from a load 2, a compensator, connected between the service ports 6, 7 of the valve and the load, restricts the flow in the service lines so as to maintain a constant pressure difference between the supply pressure and the pressure at the service port supplying the load. In operation, a spring 23 in the compensator is set so as to correspond to the pressure to be dropped across the valve 1, e.g. 125 lbs. per sq.in. If the valve 1 is moved to the left in Fig.1, pilot pressure in the valve also operates a shuttle valve 22 connecting the service port 6 to the end space of the compensator 13 where it acts on the spool 18 in addition to the spring 23 so as to oppose the supply pressure which acts on the other end 21 of the spool. When the load starts to move and if the pressure at the service port 6 falls, the supply pressure overcomes these combined pressures, moves the spool 18 to the left causing lands 19, 20 to close ports 14, 15 and restricting the flow so that the predetermined pressure drop is maintained at the port 6. Thus, the rate of movement of the load is set by valve 1 independently of the magnitude of the load. If pressure at the service port 6 rises, the spool 18 moves to the right to maintain the pressure drop. If the load tends to over-run pressure in port 6 drops causing the compensator to close restricting the flow in both service lines so that no cavitation occurs. The pressure from a ball-shuttle valve 24 may be carried through a line 25 to the power unit where it may control an off-loading valve or a swash plate pump. Fig.2 shows how a polarity sensing valve 30 may be used to provide pilot pressures to the shuttle valve 22. Figs.3-10 (not shown), illustrate the construction of a valve block suitable for the circuit described.
GB2295073A 1973-05-15 1973-05-15 Hydraulic systems Expired GB1452609A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB2295073A GB1452609A (en) 1973-05-15 1973-05-15 Hydraulic systems
US467082A US3903786A (en) 1973-05-15 1974-05-06 Hydraulic systems
IT22699/74A IT1012352B (en) 1973-05-15 1974-05-14 HYDRAULIC SYSTEM
DE2423595A DE2423595C2 (en) 1973-05-15 1974-05-15 Hydraulic circuit arrangement
FR7416830A FR2229878B1 (en) 1973-05-15 1974-05-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2295073A GB1452609A (en) 1973-05-15 1973-05-15 Hydraulic systems

Publications (1)

Publication Number Publication Date
GB1452609A true GB1452609A (en) 1976-10-13

Family

ID=10187694

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2295073A Expired GB1452609A (en) 1973-05-15 1973-05-15 Hydraulic systems

Country Status (5)

Country Link
US (1) US3903786A (en)
DE (1) DE2423595C2 (en)
FR (1) FR2229878B1 (en)
GB (1) GB1452609A (en)
IT (1) IT1012352B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153979A (en) * 1984-02-13 1985-08-29 Koehring Co Post-pressure-compensated unitary hydraulic valve
US5305789A (en) * 1992-04-06 1994-04-26 Rexroth-Sigma Hydraulic directional control valve combining pressure compensation and maximum pressure selection for controlling a feed pump, and multiple hydraulic control apparatus including a plurality of such valves

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA7696B (en) * 1975-02-06 1976-12-29 Commercial Shearing Compensated work port fluid valves and work port compensators
DE2810375A1 (en) * 1978-03-10 1979-09-20 Bosch Gmbh Robert CONTROL DEVICE FOR HYDRAULIC POWER TRANSFER
DE2962702D1 (en) * 1978-08-25 1982-06-24 Dewandre Co Ltd C Improvements relating to hydraulic control systems
DE4208755A1 (en) * 1992-03-19 1993-09-23 Schwing Gmbh F HYDRAULIC SLIDER CONTROL FOR WORK CYLINDERS WITH UNEQUALIZED PISTON SPEEDS
US6895852B2 (en) * 2003-05-02 2005-05-24 Husco International, Inc. Apparatus and method for providing reduced hydraulic flow to a plurality of actuatable devices in a pressure compensated hydraulic system
CN105736497B (en) * 2014-12-10 2018-03-02 西安航空动力控制科技有限公司 A kind of safety valve component with lock function
CN109654074B (en) * 2018-12-26 2020-04-07 太原理工大学 Hydraulic system of engineering machinery

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909195A (en) * 1958-03-24 1959-10-20 Borg Warner Servo valve
US3234957A (en) * 1963-04-22 1966-02-15 Fawick Corp Adjustable, metered directional flow control arrangement
CH444601A (en) * 1966-12-13 1967-09-30 Beringer Hydraulik Gmbh Control device for hydraulically operated equipment
US3555970A (en) * 1968-08-08 1971-01-19 Bell Aerospace Corp Pressure regulator for servo valve having dynamic load adaptive response
US3685540A (en) * 1971-01-18 1972-08-22 Koehring Co Fluid flow controlling device for reversible fluid motors
US3854382A (en) * 1973-06-20 1974-12-17 Sperry Rand Ltd Hydraulic actuator controls

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153979A (en) * 1984-02-13 1985-08-29 Koehring Co Post-pressure-compensated unitary hydraulic valve
US5305789A (en) * 1992-04-06 1994-04-26 Rexroth-Sigma Hydraulic directional control valve combining pressure compensation and maximum pressure selection for controlling a feed pump, and multiple hydraulic control apparatus including a plurality of such valves

Also Published As

Publication number Publication date
IT1012352B (en) 1977-03-10
FR2229878A1 (en) 1974-12-13
DE2423595A1 (en) 1974-12-05
FR2229878B1 (en) 1979-09-28
US3903786A (en) 1975-09-09
DE2423595C2 (en) 1985-07-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee