Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Patent
1983-12-08
1985-04-23
Walton, George L.
Fluid handling
Liquid level responsive or maintaining systems
By float controlled valve
251 28, 251DIG1, F16K 3134
Patent
active
045123659
ABSTRACT:
An improved float actuated pilot valve is shown for use in an oil and gas separator. The pilot valve has a valve body with a gas inlet, a lower chamber communicating with the gas inlet, an upper chamber, a gas outlet, and a gas passage connecting the upper chamber, lower chamber, and gas outlet. An actuator piston is contained within the upper chamber and has a top stem contactable by the flapper arm of a displaceable float located within the separator. The actuator piston also has a bottom stem which is slidably received within a portion of the valve gas passage. A control piston is contained within the lower chamber and has an upper stem in contact with the actuator bottom stem and has a lower stem. The control piston has an upper sealing face which sealingly engages the opening of the gas passage into the lower chamber. A coil spring normally biases the control valve sealing face toward a closed position in contact with the gas passage opening to block the flow of gas from the gas outlet. When the liquid level within the separator rises above a predetermined limit, the displaceable float acts upon the actuator piston top stem to move the control piston out of sealing engagement with the gas passage opening, thereby allowing gas to flow from the lower chamber through the gas passage to the gas outlet. The flow of gas from the gas outlet results in a pilot signal being sent to the liquid discharge valve to open the valve and discharge liquid from the separator tank.
REFERENCES:
patent: 753999 (1904-03-01), Mosher
patent: 810237 (1906-01-01), Wadsworth
patent: 2064962 (1936-12-01), Waters
patent: 2348357 (1944-05-01), Parks
patent: 2484102 (1949-10-01), LeValley
patent: 2656144 (1953-10-01), Frantz
patent: 2700307 (1955-01-01), Thoresen
patent: 2892644 (1959-06-01), Collins
patent: 2997053 (1961-08-01), Walker
Anderson R. David
Jacobs George S.
Gunter Jr. Charles D.
Walton George L.
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