Hydraulic elevator pressure relief valve

Details Hydraulic elevator pressure relief valve Hydraulic elevator pressure relief valve

1992-08-03

1994-03-01

Dayoan, D. Glenn

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 292, 91454, B66B 1104

Patent

active

052899012

ABSTRACT:
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.

REFERENCES:
patent: 3842943 (1974-10-01), Nakamura et al.
patent: 4676140 (1987-06-01), Haussler
patent: 5082091 (1992-01-01), Fargo

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