Load responsive control valve
OwnerTadeusz Budzichinventor
Life of this patent
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Abstract
A pressure compensated load responsive flow control valve for use in a system controlling a plurality of loads. The system is powered by a single, fixed displacement pump. The flow control valve is equipped with a load responsive control, which during simultaneous control of multiple loads automatically maintains the pump discharge pressure at a level higher by a constant pressure differential than the pressure required by the largest load being controlled and which while system loads are not being controlled using external source of pressure fully opens pump bypass and reduces the pump bypass pressure to a minimum level.
Claims10
A valve assembly comprising at least one housing having an inlet chamber connected to a pump, a load chamber, exhaust means communicable with reservoir means, a source of pressure fluid other than said pump, first valve means for selectively interconnecting said load chamber with said inlet chamber and said exhaust means, load sensing port means selectively communicable with said load chamber by said first valve means, bypass valve means between said inlet chamber and said exhaust means, pilot valve means having means responsive to pressure differential between pressure in said inlet chamber and pressure in said load sensing port means and means supplied by said source of pressure fluid operable to control said bypass valve means to vary bypass flow between said inlet chamber and said exhaust means to maintain a constant pressure differential between said inlet chamber and said load sensing port means.
Dependencies are inferred from the claim text.