Control valve for a hydraulic elevator

Details Control valve for a hydraulic elevator Control valve for a hydraulic elevator

1990-12-19

1991-09-10

Valenza, Joseph E.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

60329, 187 292, B66B 904

Patent

active

050465864

ABSTRACT:
Control valve for a hydraulic elevator provided with a speed regulating plug which moves in response to the flow of hydraulic fluid, whereby the position of the speed regulating plug determines the rate of flow of hydraulic fluid into the actuating cylinder of the elevator, and a hydraulic channel system forming an essentially closed loop. The invention achieves a constant rate of deceleration of the elevator regardless of variations in the temperature of the hydraulic fluid by providing the hydraulic channel system with a flow resistance component placed near one end of the speed regulating plug, the setting of the flow resistance component being varied in response to variations in the temperature of the hydraulic fluid.

REFERENCES:
patent: 3530958 (1970-09-01), Brannon et al.
patent: 4426194 (1984-01-01), Pollman
patent: 4955194 (1990-09-01), Christensen et al.

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