Load responsive control valve
OwnerTadeusz Budzichinventor
Life of this patent
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Abstract
A 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 equipped with a load responsive bypass valve or a variable displacement pump equipped with 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. The load responsive valve is of a four position float type which in the float position while isolating system pump and connecting both of the load chambers to system reservoir blocks pressure sensing ports from inlet chamber and connects them to system reservoir to permit full unloading of the system pump.
Claims8
A load responsive valve assembly comprising at least one valve housing having an inlet chamber, first and second load chambers, at least one exhaust chamber, and load sensing port means operable through signal conducting passage means to transmit load pressure signal to output flow control means of a pump, direction control means for selectively interconnecting and isolating said chambers and said load sensing port means in a number of control positions including a neutral position and a float position, in said float position said direction control means having means for interconnecting said first and second load chambers with said exhaust chamber, means for isolating said inlet chamber from said first and second load chambers and said exhaust chamber, means on said direction control means for blocking said load sensing port means, and means for connecting said signal conducting means with said exhaust chamber down stream of passages connecting said load chambers with said exhaust chambers.
A load responsive valve assembly comprising at least one valve housing having an inlet chamber, first and second load chambers, at least one exhaust chamber, and load sensing port means operable through signal conducting passage means to transmit load pressure signal to output flow control of a pump, direction control means for selectively interconnecting and isolating said chambers and said load sensing port means in a number of control positions including a neutral position and a float position, in said float position said direction control means having means for interconnecting said first and second load chambers with said exhaust chamber, means for isolating said inlet chamber from said first and second load chambers and said exhaust chamber, means for blocking said load sensing port means, and means responsive to movement of said direction control means having means for connecting said signal conducting means with said exhaust chamber.
Dependencies are inferred from the claim text.