Hydraulic safety brake valve arrangement for load lowering

Details Hydraulic safety brake valve arrangement for load lowering Hydraulic safety brake valve arrangement for load lowering

1988-12-16

1990-11-27

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

91445, 91447, F15B 1104

Patent

active

049727613

ABSTRACT:
A hydraulic safety brake valve arrangement for a motor controlled by a directional control valve. The safety brake valve arrangement has a main valve closing the load lowering conduit in a rest position. Pump pressure opens the main valve to throttle exhausted fluid and at the same time throttle fluid through the supply conduit to the opposed motor chamber. A compensating valve is placed in series with the main valve throttle for the loaded side of the motor. Motor speed is thereby controlled independent of the external loading on the motor.

REFERENCES:
patent: 4244275 (1981-01-01), Smilges
patent: 4342256 (1982-08-01), Andersen et al.
patent: 4411189 (1983-10-01), Miller
patent: 4418612 (1983-12-01), Nanda
patent: 4569272 (1986-02-01), Taylor et al.

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