Combination check and flow control valve for hydraulic systems

Details Combination check and flow control valve for hydraulic systems Combination check and flow control valve for hydraulic systems

1978-04-19

1980-05-27

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91447, 1375962, F15B 1108, F15B 13042

Patent

active

042044596

ABSTRACT:
A hydraulic system including a hydraulic pump, a hydraulic motor having at least one port and a hydraulic reservoir. A main spool valve is interposed between the motor and the pump and reservoir and has a spool shiftable between positions connecting the pump to the port, connecting the reservoir to the port, and blocking fluid flow to or from the port. A single combination check and flow control valve is interposed between the main spool valve and the port. A fluid responsive surface opens the combination valve to permit relatively free flow of fluid therethrough when the spool is in the first mentioned position thereof. A pressure responsive surface and a control valve provides for partial opening of the combination valve to meter fluid flow therethrough when the spool is in the second position thereof. A spring is operative to close the combination valve to prevent fluid flow therethrough when the spool is in the last mentioned position thereof.

REFERENCES:
patent: 3213874 (1965-10-01), Schmiel et al.
patent: 3464320 (1969-09-01), Richardson
patent: 3570519 (1971-03-01), Bianchetta
patent: 3658090 (1972-04-01), Kowalski et al.
patent: 3763746 (1973-10-01), Walters
patent: 3788401 (1974-01-01), Scheidt et al.
patent: 3795255 (1974-03-01), Malott et al.
patent: 3972267 (1976-08-01), Haak et al.
patent: 4006667 (1977-02-01), Bianchetta et al.
patent: 4088151 (1978-05-01), Schurger

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