Hydraulic systems

Details Hydraulic systems Hydraulic systems

1995-10-11

1996-12-17

Nguyen, Hoang

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91366, 91459, F15B 1316

Patent

active

055842240

ABSTRACT:
An hydraulic lift system has an actuator connected to an hydraulic circuit, having a pump, via a supply line. A balanced seated valve is connected between the supply line and a reservoir, the valve being controlled by a solenoid and an electric drive unit. The drive unit supplies a gradually increasing or decreasing voltage to the solenoid to open or close the valve gradually. The valve has a valve member that is displaceable along its length and has a valve head of frusto-conical shape. A passage along the valve member balances fluid pressure across the valve member. The solenoid has an armature with a pole face that can be displaced towards a fixed pole face to unseat the valve member. The pole faces have complementary frusto-conical surfaces and there is a non-magnetic washer between them.

REFERENCES:
patent: 4452267 (1984-06-01), Ott et al.
patent: 4548296 (1985-10-01), Hasegawa
patent: 4585205 (1986-04-01), Coppola et al.
patent: 4628499 (1986-12-01), Hammett
patent: 4813339 (1989-03-01), Uno et al.
patent: 5095804 (1992-03-01), Borch
patent: 5357878 (1994-10-01), Hare

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