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GB781297A - Improvements in or relating to hydraulic pressure relief valves - Google Patents

Improvements in or relating to hydraulic pressure relief valves

Info

Publication number
GB781297A
GB781297A GB18100/54A GB1810054A GB781297A GB 781297 A GB781297 A GB 781297A GB 18100/54 A GB18100/54 A GB 18100/54A GB 1810054 A GB1810054 A GB 1810054A GB 781297 A GB781297 A GB 781297A
Authority
GB
United Kingdom
Prior art keywords
piston
valve
plunger
hydraulic pressure
closure member
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
GB18100/54A
Inventor
Robert Histon
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.)
WILD A G & CO Ltd
Original Assignee
WILD A G & CO 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 WILD A G & CO Ltd filed Critical WILD A G & CO Ltd
Priority to GB18100/54A priority Critical patent/GB781297A/en
Publication of GB781297A publication Critical patent/GB781297A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/50—Component parts or details of props
    • E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
    • E21D15/512—Arrangement of valves
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14—Telescopic props
    • E21D15/46—Telescopic props with load-measuring devices; with alarm devices
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)

Abstract

781,297. Valves. WILD & CO., Ltd., A. G. Aug. 3, 1955 [June 21, 1954], No. 18100/54. Class 135. In an automatic-hydraulic pressure-relief valve comprising a main closure-member 5 normally held on its seat by a spring 23 and hydraulic pressure acting in opposition to the pressure on a larger area, such as a piston 11, operatively associated with the closure member, a manually-operated device, for example a valve, is provided for assisting the hydraulic pressure acting on the larger area to open the closure member 5 when desired. The fluid in the inlet 2 both acts on the closure member 5, urging it on to its rubber or like seat 18, and flows through a bore 13, and ports 14, 15, the former of which is smaller than the latter, to act on each face of the piston 11 having a plunger 9 that abuts the stem 19a of the member 5, the pressure difference between the faces of the piston being proportional to the cross-section of the plunger 9, that is made slightly greater than that of the member 5, whereby the resultant force tending to lift the latter is small and a light spring 23 is normally sufficient to hold the member 5 on its seat. When the inlet and hence the resultant pressure increases and overcomes the spring 23 the valve 5 is opened and the fluid in the inlet 2 is then in direct communication with the outlet 3. The member 5 may be opened by actuating the manual valve that exhausts the space on the plunger side of the piston 11. A screwed cap 12 for the piston chamber may be provided to impart a thrust to the piston to open the member 5 upon manual rotation thereof. The valve chamber 4 may incorporate threaded bores for the reception of a non- return valve and a pressure gauge, not shown. In a modification, the plunger, one of the ports and the manual valve are dispensed with, the closure member being manually opened by rotating a cylinder having a cam surface which, through a spindle, imparts a thrust to the closure member.
GB18100/54A 1954-06-21 1954-06-21 Improvements in or relating to hydraulic pressure relief valves Expired GB781297A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB18100/54A GB781297A (en) 1954-06-21 1954-06-21 Improvements in or relating to hydraulic pressure relief valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18100/54A GB781297A (en) 1954-06-21 1954-06-21 Improvements in or relating to hydraulic pressure relief valves

Publications (1)

Publication Number Publication Date
GB781297A true GB781297A (en) 1957-08-14

Family

ID=10106647

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18100/54A Expired GB781297A (en) 1954-06-21 1954-06-21 Improvements in or relating to hydraulic pressure relief valves

Country Status (1)

Country Link
GB (1) GB781297A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2748107A1 (en) * 1977-10-27 1979-05-03 Schenck Ag Carl DIFFERENTIAL PRESSURE LIMITING VALVE
GB2137775A (en) * 1983-03-09 1984-10-10 Robert Mcgregor Fairweather Improvements relating to pressure and safety relief valves

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2748107A1 (en) * 1977-10-27 1979-05-03 Schenck Ag Carl DIFFERENTIAL PRESSURE LIMITING VALVE
GB2137775A (en) * 1983-03-09 1984-10-10 Robert Mcgregor Fairweather Improvements relating to pressure and safety relief valves

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