Control valve for a hydraulic elevator

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

B - Operations, Transporting

66

B

187/6, 138/79

B66B 1/04 (2006.01) B66B 1/26 (2006.01)

Patent

CA 2032439

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.

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