Fluid circuit

Details Fluid circuit Fluid circuit

1977-04-06

1979-11-27

Nilson, Robert G.

Motors: expansible chamber type

With motive fluid valve

To provide unequal inlet and exhaust flow rates to single...

91447, F15B 13042, F15B 1104

Patent

active

041754735

ABSTRACT:
A fluid circuit including an actuator, a flow-direction change-over valve and a pressure source. The actuator includes a piston-rod-side chamber and a piston-head-side chamber which are partitioned by a piston. In a fluid path leading from the piston-head-side chamber to the flow-direction change-over valve, there is provided a flow-rate-control, pressure-regulating valve assembly for regulating a fluid pressure to be fed into the piston-head chamber, thereby saving energy required for a return stroke of a piston. In another fluid path leading from the piston-head-side chamber to the flow-direction change-over valve, there is provided a check valve and throttle valve assembly. The check valve in the valve assembly may be of a type which allows the flow of a fluid only in the direction towards the piston-head-side chamber (a meter-in control) or may be of a type which allows the flow of a fluid only in the direction from the piston-head-side chamber (meter-out control). For accelerating an advancing stroke of a piston in the meter-in control type actuator at a safe speed, a speed control safety valve and a quick discharge valve assembly is incorporated in the fluid path leading to the cylinder-head-side chamber in the actuator in place of the aforesaid check valve and a throttle valve assembly.

REFERENCES:
patent: Re29292 (1977-07-01), Tennis
patent: 840876 (1907-01-01), Steedman
patent: 2272684 (1942-02-01), Vickers
patent: 2501483 (1950-03-01), Taylor
patent: 2570937 (1951-10-01), Gash
patent: 3213886 (1965-10-01), Pearne

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