Fluid pressure operated shut off valve apparatus

Details Fluid pressure operated shut off valve apparatus Fluid pressure operated shut off valve apparatus

1974-07-29

1976-02-10

Rosenthal, Arnold

Fluid handling

Systems

Plural noncommunicating flow paths

251 57, 251 62, 251 31, F16K 31143

Patent

active

039372510

ABSTRACT:
Emergency shutoff valve apparatus, including a gate valve assembly actuated to a closed position by fluid pressure acting on an actuator piston, such actuation causing the piston to exert a force through a liquid medium on a power piston to store energy in a spring device or other energy storing means. Relieving of the fluid pressure acting on the piston causes the energy storing means to act through the power piston and liquid medium to shift the actuator piston to a position closing the gate valve assembly. The gate valve assembly can also be shifted to a closed position by supplemental fluid pressure acting on the power piston or on an override piston.

REFERENCES:
patent: 3604679 (1971-09-01), Pennington
patent: 3633608 (1972-01-01), Minkner
patent: 3635436 (1972-01-01), Tillman
patent: 3646962 (1972-03-01), Jones

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