Pressure responsive pilot control valve

Details Pressure responsive pilot control valve Pressure responsive pilot control valve

1991-10-04

1993-05-25

Cohan, Alan

Fluid handling

Systems

Supply and exhaust

137458, 13759618, F16K 1700

Patent

active

052131335

ABSTRACT:
A pressure responsive pilot control valve has a spool which is movable by a metal diaphragm sensing the pressure in a flowline. The spool includes two poppet seal rings mounted thereon, the poppet seal rings having concentric axes and which are used for opening and closing fluid ports. The fluid ports are opened and closed for the purpose of sending a signal to a latching relay valve to bleed off a shut in valve actuator which will terminate flow in the flowline. The poppet seal rings of the pilot move responsive to a high or a low pressure condition. A low pressure spring is provided for measuring a low pressure condition and a high pressure spring is provided for measuring a high pressure condition.

REFERENCES:
patent: 3443596 (1969-05-01), Klenk
patent: 3756264 (1973-09-01), Fisher
patent: 4117865 (1978-10-01), Beck
patent: 4494508 (1985-01-01), Young
patent: 4738278 (1988-04-01), Sauder
patent: 4961560 (1990-10-01), Ellett
Axelson product information publication "High-Low Pressure Sensors"-- undated.

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