초록 ▼

A hydraulic elevator pressure relief valve is activated if a pilot valve disposed therein senses an excessive pressure build up within a hydraulic elevator system. The pilot valve opens once excess fluid pressure force is detected. A main piston then facilitates communication between a solenoid valv

A hydraulic elevator pressure relief valve is activated if a pilot valve disposed therein senses an excessive pressure build up within a hydraulic elevator system. The pilot valve opens once excess fluid pressure force is detected. A main piston then facilitates communication between a solenoid valve disposed within the valving system and the drain pressure thereby closing a check valve and thus stopping an elevator car from further movement. The main piston further ports the excess fluid pressure force from the system to drain pressure, thus stabilizing the fluid pressure force therein.

대표청구항 ▼

A hydraulic elevator system comprising: a cab, a plunger attaching to said cab, a cylinder for translatingly receiving said plunger, a pump means for communicating a variable fluid pressure to said cylinder, a variable speed motor for providing power to said pump, and a valve for communicating said

A hydraulic elevator system comprising: a cab, a plunger attaching to said cab, a cylinder for translatingly receiving said plunger, a pump means for communicating a variable fluid pressure to said cylinder, a variable speed motor for providing power to said pump, and a valve for communicating said variable fluid pressure between said pump and said cylinder, said valve comprising; a check valve for preventing a flow of said variable fluid pressure between said cylinder and said pump, a first circuit means for directing said variable fluid pressure force upon said check valve to urge said check valve to open against a cylinder fluid pressure force if said pump fluid pressure force is approximately equal to said cylinder fluid pressure force, and a second circuit means for closing said check valve by diverting said fluid pressure from said first circuit means to drain pressure when said second circuit means senses that said pump fluid pressure exceeds a preset fluid pressure limit prescribed therein, thereby preventing said elevator cab from further movement, and for reducing said fluid pressure force within said hydraulic elevator system when said second circuit means senses that said pump fluid pressure force exceeds a preset fluid pressure limit prescribed therein, thereby preserving the integrity of said hydraulic elevator system.