Controlled float circuit for an actuator

Details Controlled float circuit for an actuator Controlled float circuit for an actuator

1999-06-01

2000-07-25

Michalsky, Gerald A.

Motors: expansible chamber type

With motive fluid valve

For double-acting motor

91447, 91459, F15B 13043

Patent

active

060924543

ABSTRACT:
A controlled float circuit is provided for controlling a load free of requiring flow from the source of pressurized fluid even when the float mode is activated with the load above the ground. The subject invention includes having a load lowering check valve arrangement disposed adjacent an actuator having first and second inlet ports with a pilot operated check valve disposed between the second inlet port and a location downstream of the load lowering valve. A first normally open electrically controlled valve is disposed in the pilot conduit leading to one end of a directional control valve and a second normally closed electrically controlled valve disposed between a source of pressurized pilot fluid and the pilot stage of the pilot operated check valve. Engagement of the float mode of operation blocks pilot flow to one end of the directional valve and opens the pilot operated check valve. A down command signal is blocked from the directional control valve but directed to the load lowering valve to controllably pass fluid from one end of the actuator to the other while not requiring any flow from the source of pressurized fluid.

REFERENCES:
patent: 4290447 (1981-09-01), Knutson

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