Vent control for cylinder mounted load check valves

Details Vent control for cylinder mounted load check valves Vent control for cylinder mounted load check valves

1977-04-07

1978-12-19

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91447, 1375962, F15B 1108, F15B 13042

Patent

active

041300491

ABSTRACT:
A fluid source for delivering fluid to a control valve having Float, First direction and Second direction positions. A piston-bore check valve allows flow to the motor and normally blocks reverse flow, the piston having its first end biased against a seat. A control chamber communicates with the piston's second end. Flow is restricted between the motor's first end and the control chamber and there is a full flow path between the motor's first end and the bore to provide a force acting against the piston's first end. The control chamber connects with a sump. A drain valve entry port communicates with the motor's first end and an exit port thereof communicates with the sump to provide either entry port-exit port connection or blocking. A mechanism moves responsive to shifting of the control valve to shift the drain valve to connect the entry and exit ports when the control valve is in a Float or a Lower position and to block such connection in a Raise or Neutral position.

REFERENCES:
patent: 1420256 (1922-06-01), Hammond, Jr.
patent: 3049101 (1962-08-01), Ruhl
patent: 3127688 (1964-04-01), Hein et al.
patent: 3274902 (1966-09-01), Kleckner
patent: 3523490 (1970-08-01), Bianchetta
patent: 3788401 (1974-01-01), Scheidt et al.
patent: 3795255 (1974-03-01), Malott et al.
patent: 3800670 (1974-04-01), Hufeld et al.
patent: 3908515 (1975-09-01), Johnson
patent: 4006667 (1977-02-01), Bianchetta et al.
patent: 4018350 (1977-04-01), Brown

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