Elevator valve apparatus
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United States of America Patent
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Aug 20, 1991
Grant Date -
N/A
app pub date -
Jan 31, 1990
filing date -
Jan 31, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An elevator valve apparatus for controlling the hydraulic supply flow to the hydraulic actuator and the hydraulic discharge flow from the actuator, comprises a solenoid proportional control valve device for ascending, a solenoid proportional control valve device for descending, and a valve control unit for controlling both of the control valve devices with a predetermined acceleration characteristic and a predetermined deceleration characteristic by an open loop control system. Furthermore, if preferable, the valve control unit carries out oil temperature compensating control, pressure compensating control, pre-start pressure raising compensation control, and feedback control of the supply flow in the low speed ascending.
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