Hydraulic systems
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United States of America Patent
Stats
-
Dec 17, 1996
Grant Date -
N/A
app pub date -
Oct 11, 1995
filing date -
Oct 20, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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