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

F - Mech Eng,Light,Heat,Weapons

16

K

137/56, 61/66

F16K 15/00 (2006.01) F16K 17/08 (2006.01) F16K 31/00 (2006.01)

Patent

CA 1086180

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-returnable 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 is normally pressur- ized to the pressure of the load chamber.

312418

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