Relief valves and mine props incorporating the same

Details Relief valves and mine props incorporating the same Relief valves and mine props incorporating the same

1978-04-03

1980-12-09

Cohen, Irwin C.

Motors: expansible chamber type

With signal, indicator or inspection means

91454, 1375962, 137557, 248354H, 251 43, F01B 3112, F15B 1304, F16K 3700

Patent

active

042377692

ABSTRACT:
A relief valve assembly particularly in combination with yieldable pit posts is provided having an elongate housing, a first load chamber at one end of said housing, an inlet aperture into said housing, a non-return valve in said inlet aperture for admitting fluid non-returnably into said load chamber, a first valve seat in said housing communicating with said load chamber, a spring loaded relief valve movable lengthwise of the housing and normally engaging said seat to close the load chamber, a second valve seat in said housing spaced lengthwise from said first valve seat and relief valve and forming therebetween a balancing load chamber, a spring loaded pilot relief valve movable lengthwise of the housing and normally engaging said second seat to close the same, and a regulated orifice means in said relief valve connecting the first load chamber and the balancing load chamber whereby said balancing load chamber is normally pressurized to the pressure of the load chamber.

REFERENCES:
patent: 1593648 (1926-07-01), Berger
patent: 1660382 (1928-02-01), Hopkins
patent: 1949150 (1934-02-01), Eplett
patent: 2477496 (1949-07-01), Russell
patent: 2621631 (1952-12-01), Dowty
patent: 3164166 (1965-01-01), Tennis
patent: 3197168 (1965-07-01), Cowlishaw
patent: 3212523 (1965-10-01), Martin
patent: 3699991 (1972-10-01), Munch
patent: 3820444 (1974-06-01), Ward

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