GB2009454A - Improvements in or relating to pressure relief valves - Google Patents

Improvements in or relating to pressure relief valves

Info

Publication number
GB2009454A
GB2009454A GB7846822A GB7846822A GB2009454A GB 2009454 A GB2009454 A GB 2009454A GB 7846822 A GB7846822 A GB 7846822A GB 7846822 A GB7846822 A GB 7846822A GB 2009454 A GB2009454 A GB 2009454A
Authority
GB
United Kingdom
Prior art keywords
relief valve
pressure
chamber
pilot
control chamber
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.)
Granted
Application number
GB7846822A
Other versions
GB2009454B (en
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.)
Sperry Corp
Original Assignee
Sperry Rand 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 Sperry Rand Corp filed Critical Sperry Rand Corp
Priority to GB7846822A priority Critical patent/GB2009454B/en
Publication of GB2009454A publication Critical patent/GB2009454A/en
Application granted granted Critical
Publication of GB2009454B publication Critical patent/GB2009454B/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
    • F16K17/10—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 auxiliary valve for fluid operation of the main valve
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
    • G05D16/2024—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means the throttling means being a multiple-way valve
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2093—Control of fluid pressure characterised by the use of electric means with combination of electric and non-electric auxiliary power
    • G05D16/2097—Control of fluid pressure characterised by the use of electric means with combination of electric and non-electric auxiliary power using pistons within the main valve

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)

Abstract

A pilot operated relief valve has a main relief valve (10) and a pilot relief valve (31) connected between a control chamber (23) and drain. A restriction (16) connects the control chamber (23) to the inlet chamber (22) which is separated from the control chamber by a piston (24) integral with the main relief valve closure member (12). Thus opening of the pilot relief valve against the adjustable force of a spring (14) determines the maximum pressure in the inlet chamber (22). The control chamber (23) can also be connected to drain (70) by a pilot valve (19) which is operated by a force motor (52) against pressure in a feedback chamber (56) connected to the inlet passage (22). The energisation of the force motor (52) can be adjusted to adjust the relief pressure to a value below that at which the pilot relief valve (31) opens. Alternatively the pressure in the feedback chamber (56) can depend on the pressure at at least one side of a load fed via a directional valve from the inlet passage (26). <IMAGE>
GB7846822A 1977-09-03 1978-12-01 Pressure relief valves Expired GB2009454B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7846822A GB2009454B (en) 1977-09-03 1978-12-01 Pressure relief valves

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3686977 1977-09-03
GB7846822A GB2009454B (en) 1977-09-03 1978-12-01 Pressure relief valves

Publications (2)

Publication Number Publication Date
GB2009454A true GB2009454A (en) 1979-06-13
GB2009454B GB2009454B (en) 1982-03-17

Family

ID=26263264

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7846822A Expired GB2009454B (en) 1977-09-03 1978-12-01 Pressure relief valves

Country Status (1)

Country Link
GB (1) GB2009454B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0267798A2 (en) * 1986-11-13 1988-05-18 Westinghouse Electric Corporation Multiphase valve testing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0267798A2 (en) * 1986-11-13 1988-05-18 Westinghouse Electric Corporation Multiphase valve testing
EP0267798A3 (en) * 1986-11-13 1988-09-07 Westinghouse Electric Corporation Multiphase valve testing

Also Published As

Publication number Publication date
GB2009454B (en) 1982-03-17

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee