GB877624A - Improvements in release valves for hydraulic props - Google Patents

Improvements in release valves for hydraulic props

Info

Publication number
GB877624A
GB877624A GB2473058A GB2473058A GB877624A GB 877624 A GB877624 A GB 877624A GB 2473058 A GB2473058 A GB 2473058A GB 2473058 A GB2473058 A GB 2473058A GB 877624 A GB877624 A GB 877624A
Authority
GB
United Kingdom
Prior art keywords
valve
pressure
release
auxiliary
prop
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
GB2473058A
Inventor
John James Wilson
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.)
Dowty Mining Equipment Ltd
Original Assignee
Dowty Mining Equipment 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 Dowty Mining Equipment Ltd filed Critical Dowty Mining Equipment Ltd
Priority to GB2473058A priority Critical patent/GB877624A/en
Priority to DED31197A priority patent/DE1130779B/en
Priority to FR801588A priority patent/FR1231525A/en
Publication of GB877624A publication Critical patent/GB877624A/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
    • 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)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Safety Valves (AREA)

Abstract

877,624. Valves. DOWTY MINING EQUIPMENT Ltd. July 23, 1959 [July 31, 1958], No. 24730/58. Class 135. In an hydraulic pit prop having the usual load-bearing cylinder and ram members 11, 13 enclosing an hydraulic pressure chamber 16, the pressure in this chamber is releasable to a low-pressure side 17 to allow the prop to contract, through a main pressure release valve 19 and an auxiliary pressure-release valve 28 respectively controlling relatively large and small flow openings, a hand-operated valverelease mechanism includes a rigid movable operating member 32, 34 acting on the auxiliary valve to open it, and a spring 33 interposed between the rigid operating element and the main valve 19 causes this valve to open when the pressure difference across it has been substantially reduced through the auxiliary valve. The auxiliary valve is actuated by a hand lever 40 through an eccentric pin and rod connection 37, 35, this being so arranged that the operating member 32, 34 cannot bottom on the main valve member. The flow opening allowed past the stem 32 of the auxiliary valve-operating member is such as to delay release of pressure for safety reasons. Normal contraction of the prop under excessive load is allowed by release of the pressure through a relief valve 18.
GB2473058A 1958-07-31 1958-07-31 Improvements in release valves for hydraulic props Expired GB877624A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2473058A GB877624A (en) 1958-07-31 1958-07-31 Improvements in release valves for hydraulic props
DED31197A DE1130779B (en) 1958-07-31 1959-07-30 Hydraulic pit ram
FR801588A FR1231525A (en) 1958-07-31 1959-07-30 hydraulic stanchion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2473058A GB877624A (en) 1958-07-31 1958-07-31 Improvements in release valves for hydraulic props

Publications (1)

Publication Number Publication Date
GB877624A true GB877624A (en) 1961-09-20

Family

ID=10216346

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2473058A Expired GB877624A (en) 1958-07-31 1958-07-31 Improvements in release valves for hydraulic props

Country Status (3)

Country Link
DE (1) DE1130779B (en)
FR (1) FR1231525A (en)
GB (1) GB877624A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3389886A (en) * 1963-05-13 1968-06-25 A R L Named S T Dupont Soc Pneumatic pilot valve with snap action
US3638689A (en) * 1969-05-29 1972-02-01 Ljungmans Verkstader Ab Automatic dispensing nozzle
FR2422093A1 (en) * 1978-04-03 1979-11-02 Commercial Shearing SAFETY VALVE AND MINE SEAL EQUIPPED WITH THIS VALVE

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE872191C (en) * 1951-01-09 1953-03-30 Gutehoffnungshuette Oberhausen Hydraulic pit ram
DE928945C (en) * 1951-06-09 1955-06-16 Eisenwerk Wanheim G M B H Adjustable hydraulic pit ram
DE1009581B (en) * 1956-01-17 1957-06-06 Gutehoffnungshuette Sterkrade Hydraulic pit ram
BE558743A (en) * 1956-07-05

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3389886A (en) * 1963-05-13 1968-06-25 A R L Named S T Dupont Soc Pneumatic pilot valve with snap action
US3638689A (en) * 1969-05-29 1972-02-01 Ljungmans Verkstader Ab Automatic dispensing nozzle
FR2422093A1 (en) * 1978-04-03 1979-11-02 Commercial Shearing SAFETY VALVE AND MINE SEAL EQUIPPED WITH THIS VALVE

Also Published As

Publication number Publication date
DE1130779B (en) 1962-06-07
FR1231525A (en) 1960-09-29

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