Control and relief valves

Details Control and relief valves Control and relief valves

F - Mech Eng,Light,Heat,Weapons

15

B

137/97

F15B 13/02 (2006.01)

Patent

CA 1168127

ABSTRACT A pump control valve and relief valve assembly are provided in the form of a valve housing having a main bore therethrough, a spool movable in said bore and having a pair of spaced annular grooves therein, a spaced relief bore in said housing, a pump chamber and a work chamber in said housing intersecting both bores, a pair of tank chambers, one on each opposite side of the pump and work chambers intersecting said main bore, said tank chamber adjacent the work chamber intersecting the relief borer a tank bore connecting said tank chambers, an inlet return bore intersecting said tank chamber adjacent the work chamber, an inlet port connected to said relief bore and pump chamber and adapted to connect to a pump outlet port a tank port connected to said tank bore, a pump inlet port and a return port connected to said inlet return bore, said pump inlet port adapted to connect to a pump inlet port and the return port adapted to be connected to a source of return fluid, and a combination check and relief valve assembly in the relief bore at the cylinder chamber acting as a check between the inlet port and work chamber and relieving excess pressure from said work chamber to said adjacent tank chamber.

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