Hydraulically trippable check valve for underground mine support

Details Hydraulically trippable check valve for underground mine support Hydraulically trippable check valve for underground mine support

1999-03-25

2000-06-13

Huson, Gregory L.

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

137630, F16K 1518

Patent

active

060736542

ABSTRACT:
The body (1) of the hydraulically trippable check valve for mine support hydraulics according to the invention contains: a valve poppet (13) biased in the closing direction by a spring (22); a control piston (17) which can be acted on by a hydraulic control pressure, causing the poppet (13) to be lifted off its seat (11); and an initial relief valve (20, 21) which can be tripped by the control piston (17) against its spring closing force. Matters are arranged so that the control piston (17) which can be acted on by the hydraulic control pressure is dimensioned in terms of piston surface area (17') so that the poppet (13) of the check valve cannot be lifted off its seat (11) until the opening of the initial relief valve has caused a predetermined initial relief of operating pressure on the high-pressure side. The result is a hydraulically pilot-controlled check valve which has high operational reliability and in which harmful oscillation or chatter of the valve poppet (13) of the check valve and/or control piston (17) cannot occur.

REFERENCES:
patent: 2653626 (1953-09-01), Finlayson
patent: 3213887 (1965-10-01), Angelery
patent: 3447568 (1969-06-01), Burkart et al.
patent: 3631887 (1972-01-01), Schlechtriem
patent: 3638689 (1972-02-01), Eklund
patent: 3906991 (1975-09-01), Haussler
patent: 4562862 (1986-01-01), Mucheyer et al.
patent: 5618086 (1997-04-01), Reuter
patent: 5669413 (1997-09-01), Hegglin et al.

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