Valve control unit for a hydraulic elevator
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United States of America Patent
Stats
-
Jun 1, 2004
Grant Date -
Oct 24, 2002
app pub date -
Dec 19, 2001
filing date -
Jul 3, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control valve unit for a hydraulic elevator includes two control valves wherein the flow of hydraulic oil from a tank to a lifting cylinder driving an elevator cabin and/or from the lifting cylinder to the tank can be controlled. In case of an upward movement of the elevator cabin, hydraulic oil is conveyed by a pump driven by an electromotor from the tank through the control valve unit to the lifting cylinder. In the case of a downward movement of the elevator cabin, the hydraulic oil flows through the control valve unit to the tank without the pump working. The control of the upward movement and the downward movement of the elevator cabin is achieved by one single pilotable control valve, respectively, that are provided to act as a check valve as well as a proportional valve.
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