PL91078B1 - - Google Patents

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Publication number
PL91078B1
PL91078B1 PL1973164201A PL16420173A PL91078B1 PL 91078 B1 PL91078 B1 PL 91078B1 PL 1973164201 A PL1973164201 A PL 1973164201A PL 16420173 A PL16420173 A PL 16420173A PL 91078 B1 PL91078 B1 PL 91078B1
Authority
PL
Poland
Prior art keywords
valve
seat
housing according
liquid
cylinder
Prior art date
Application number
PL1973164201A
Other languages
English (en)
Polish (pl)
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 filed Critical
Publication of PL91078B1 publication Critical patent/PL91078B1/pl

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Safety Valves (AREA)
  • Fluid-Pressure Circuits (AREA)
PL1973164201A 1972-07-22 1973-07-20 PL91078B1 (enExample)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3439372A GB1430240A (en) 1972-07-22 1972-07-22 Mine roof support

Publications (1)

Publication Number Publication Date
PL91078B1 true PL91078B1 (enExample) 1977-02-28

Family

ID=10365098

Family Applications (1)

Application Number Title Priority Date Filing Date
PL1973164201A PL91078B1 (enExample) 1972-07-22 1973-07-20

Country Status (4)

Country Link
DE (1) DE2337390B2 (enExample)
GB (1) GB1430240A (enExample)
PL (1) PL91078B1 (enExample)
ZA (1) ZA734686B (enExample)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4237769A (en) * 1978-04-03 1980-12-09 Commercial Shearing, Inc. Relief valves and mine props incorporating the same
DE3340888C1 (de) * 1983-11-11 1985-02-07 Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal Hydraulischer Stempel mit Gebirgsschlagventil für ein Schreitausbaugestell
CN109322689B (zh) * 2018-10-31 2024-06-25 辽宁工程技术大学 一种防冲液压支架用压力流量函数控制阀组

Also Published As

Publication number Publication date
DE2337390A1 (de) 1974-02-07
DE2337390B2 (de) 1977-11-10
GB1430240A (en) 1976-03-31
ZA734686B (en) 1974-06-26

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