Pilot valve

Details Pilot valve Pilot valve

1977-10-06

1979-05-08

Michalsky, Gerald A.

Fluid handling

Line condition change responsive valves

Fluid opened valve requiring reset

137456, 1375961, 13759617, 13759618, 251 69, F16K 1700

Patent

active

041530721

ABSTRACT:
A monitor-actuator pilot valve operable to close a safety valve in a fluid flow system reponsive to low line pressure or electrical failure. The safety valve is held open by pressure supplied into an actuator cylinder from the line protected by the safety valve. The pilot valve includes a first flow passage communicating with line pressure, a second flow passage communicating with the safety valve actuator cylinder, a third exhaust flow passage to the atmosphere, and a fourth flow passage to a fluid pressure reset. A valve assembly in the pilot valve responds to a low pressure in the first passage or electrical failure to connect the second and third passages for exhausting control pressure from the safety valve actuator cylinder to close the safety valve. An electromagnet on the pilot valve releases the valve assembly in response to a power failure allowing the safety valve to close. A reset assembly in the valve body manually or hydraulically operates the valve assembly reopening the pilot valve. The low pressure response mechanism is reset hydraulically or manually. The electrical response mechanism is reset only manually.

REFERENCES:
patent: 3358207 (1967-12-01), Natho
patent: 4087073 (1978-05-01), Runberg

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