Pressure relief valve for hydraulic mine supporting elements

Details Pressure relief valve for hydraulic mine supporting elements Pressure relief valve for hydraulic mine supporting elements

1976-09-01

1978-09-05

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pop valves

137494, F16K 31363

Patent

active

041112270

ABSTRACT:
A pressure relief valve for hydraulic mine supporting elements, particularly mine props, has a valve member loaded in its closing direction by a spring, a piston is connected to the valve member end sealingly sliding within a cylinder of the valve housing and arranged to be acted upon in closing direction by the pressure prevailing within the space before the seat of the valve member. The valve member has a neck portion of reduced diameter between the valve seat and the piston and the annular cross section, being acted upon in closing direction, between the neck portion and the circumference of the piston is smaller than the annular cross section, being acted upon in opening direction, between the neck portion and the valve seat.

REFERENCES:
patent: 2134803 (1938-11-01), Rose
patent: 2730269 (1956-01-01), Earle
patent: 2980132 (1961-04-01), Prijatel
patent: 3277838 (1966-10-01), Canalizo

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