An illustrative example hydraulic elevator system includes an elevator car, a hydraulic plunger associated with the elevator car, a fluid reservoir and a conduit coupling the fluid reservoir and the hydraulic plunger. A pump causes fluid movement through the conduit between the fluid reservoir and the hydraulic plunger to cause selective movement of the elevator car. A shutoff valve is associated with the conduit, the shutoff valve being between the pump and the hydraulic plunger. The shutoff valve has a closed position in which the shutoff valve prevents fluid movement between the hydraulic plunger and at least one of the reservoir and the pump to prevent movement of the elevator car. The shutoff valve has an open position in which the shutoff valve permits fluid movement between the pump and the hydraulic plunger to permit movement of the elevator car. A valve actuator operates based on pressure in at least the hydraulic plunger. The valve actuator selectively causes the shutoff valve to be in the open position or the closed position.
Hydraulically activated shutoff valve for a hydraulic elevator system
2020-05-12
Patent
Electronic Resource
English
HYDRAULICALLY ACTIVATED SHUTOFF VALVE FOR A HYDRAULIC ELEVATOR SYSTEM
European Patent Office | 2018
|HYDRAULICALLY ACTIVATED SHUTOFF VALVE FOR A HYDRAULIC ELEVATOR SYSTEM
European Patent Office | 2018
|HYDRAULICALLY ACTIVATED SHUTOFF VALVE FOR A HYDRAULIC ELEVATOR SYSTEM
European Patent Office | 2018
|