Overpressure valve for a hydraulic pit prop

Details Overpressure valve for a hydraulic pit prop Overpressure valve for a hydraulic pit prop

1977-02-17

1979-09-11

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1702

Patent

active

041671988

ABSTRACT:
An overpressure valve for a hydraulic pit prop comprises a housing, a valve seat provided in the housing, a valve body movable in axial direction in the housing between a closed position engaging the valve seat and an open position, and bellows means filled with a gas under pressure arranged for biasing the valve body to the closed position.

REFERENCES:
patent: 1901740 (1933-03-01), Feeley
patent: 2509839 (1950-05-01), Panner
patent: 2556867 (1951-06-01), Carlisle
patent: 2911999 (1959-11-01), Lamb

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