Fluid handling – Systems – Supply and exhaust
Patent
1977-07-25
1980-04-22
Michalsky, Gerald A.
Fluid handling
Systems
Supply and exhaust
60427, 91516, F15B 1308
Patent
active
041990056
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 by a variable displacement pump equipped with a load responsive control, which during simultaneous control of multiple loads automatically maintains the pump discharge pressure at a level higher than the pressure required by the largest load being controlled. To transmit to the pump control signal of the highest system load, without creating a back flow, load sensing passages of individual valve spools contain check valves. Upstream of the check valves load sensing passages of individual spools are vented to reservoir with valve spools in neutral position, to prevent accumulation of leakage pressure affecting the pump control and to permit the use of priority type control with selected valve spools. Because of the load sensing passage venting feature the priority control is capable of fast response without large control leakage from the load sensing circuit with priority spool in neutral position.
REFERENCES:
patent: 3455210 (1969-07-01), Allen
patent: 3768372 (1973-10-01), McMillen
patent: 3777773 (1973-12-01), Tolbert
patent: 3807447 (1974-04-01), Masuda
patent: 3815477 (1974-06-01), Ailshie et al.
patent: 3881512 (1975-05-01), Wilke
patent: 3914939 (1975-10-01), Purdy
patent: 3971216 (1976-07-01), Miller
patent: 4051868 (1977-10-01), Anderson
patent: 4089169 (1978-05-01), Miller
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