GB1486256A - Pressure relief valves - Google Patents

Pressure relief valves

Info

Publication number
GB1486256A
GB1486256A GB5288074A GB5288074A GB1486256A GB 1486256 A GB1486256 A GB 1486256A GB 5288074 A GB5288074 A GB 5288074A GB 5288074 A GB5288074 A GB 5288074A GB 1486256 A GB1486256 A GB 1486256A
Authority
GB
United Kingdom
Prior art keywords
piston
chamber
pressure
dec
resistor
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
GB5288074A
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.)
Poclain SA
Original Assignee
Poclain SA
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 Poclain SA filed Critical Poclain SA
Publication of GB1486256A publication Critical patent/GB1486256A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
    • F16K17/065—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure with differential piston

Abstract

1486256 Fluid-pressure servomotor systems; automatic electric control POCLAIN 6 Dec 1974 [21 Dec 1973] 52880/74 Headings G3N and G3P A discharge valve 4 controlling the maximum pressure in a hydraulic circuit 3 has the fluidpressure in chamber 16 biasing the valve-member 17 closed controlled by a ball valve 23 whose spring bias is adjusted by a piston 27 which is movable in a chamber 26b. The chamber 26b is selectively connectible to a control pump 12, or a drain 2, or neither by two spring-loaded electromagnetically-operated valves 10, 11 which are operated through a Wheatstone Bridge 9 to reduce the difference between the actual position of the piston and a desired position set by a pointer 5 to zero. The hydraulic-pressure-adjusting pointer contact 5 is movable over a resistor 49 and a resistor 48 carried by the piston-rod 31 moves relative a contact 7, the resistors 48, 49 forming the arms of the Wheatstone Bridge which is connected to a power supply 52. The contacts 5, 7 are connected via amplifiers 53, 55 to devices 54, 56 controlling the electromagnets, a pulsed power converter 57 being connected to the devices.
GB5288074A 1973-12-21 1974-12-06 Pressure relief valves Expired GB1486256A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7345928A FR2255528B1 (en) 1973-12-21 1973-12-21

Publications (1)

Publication Number Publication Date
GB1486256A true GB1486256A (en) 1977-09-21

Family

ID=9129582

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5288074A Expired GB1486256A (en) 1973-12-21 1974-12-06 Pressure relief valves

Country Status (7)

Country Link
JP (1) JPS50117028A (en)
BE (1) BE822750A (en)
DE (1) DE2460216A1 (en)
ES (1) ES433067A1 (en)
FR (1) FR2255528B1 (en)
GB (1) GB1486256A (en)
IT (1) IT1024472B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4548233A (en) * 1983-04-27 1985-10-22 Mannesmann Rexroth Gmbh Electrically controlled pressure relief valve including a hydraulic bias
US4657041A (en) * 1984-08-31 1987-04-14 Aisin Seiki Kabushiki Kaisha Oil pressure control apparatus
EP1815302A2 (en) * 2004-11-03 2007-08-08 Active Shock, Inc. Electrically controlled pressure relief valve and system and method for controlling same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58196306A (en) * 1982-05-12 1983-11-15 Daikin Ind Ltd Position control device for fluid pressure piston
EP0100784B1 (en) * 1982-08-13 1986-11-20 Vickers Systems GmbH Pressure-limiting valve with electrically adjustable setting
US5692537A (en) * 1995-09-22 1997-12-02 Western Atlas International, Inc. Adjustable hydraulic control valve module

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4548233A (en) * 1983-04-27 1985-10-22 Mannesmann Rexroth Gmbh Electrically controlled pressure relief valve including a hydraulic bias
US4657041A (en) * 1984-08-31 1987-04-14 Aisin Seiki Kabushiki Kaisha Oil pressure control apparatus
EP1815302A2 (en) * 2004-11-03 2007-08-08 Active Shock, Inc. Electrically controlled pressure relief valve and system and method for controlling same
EP1815302A4 (en) * 2004-11-03 2011-12-14 Fourth Floor Associates Inc Electrically controlled pressure relief valve and system and method for controlling same

Also Published As

Publication number Publication date
FR2255528B1 (en) 1976-11-19
BE822750A (en) 1975-03-14
DE2460216A1 (en) 1975-07-03
ES433067A1 (en) 1976-11-16
FR2255528A1 (en) 1975-07-18
IT1024472B (en) 1978-06-20
JPS50117028A (en) 1975-09-12

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)