Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Patent
1990-09-17
1991-11-26
Walton, George L.
Fluid handling
Liquid level responsive or maintaining systems
By float controlled valve
137436, 251 28, 251 35, 251 46, F16K 3134, F16K 3300
Patent
active
050675168
ABSTRACT:
A pilot-operated, diaphragm-controlled float valve assembly has a primary valve and a pilot valve operated by a float arm, a cavity for the main valve is formed between a split segment casing and is divided by a valve disc centrally mounted upon a flexible diaphragm into a lower, larger, pressure-differential chamber and an upper, smaller, pressure-differential chamber, both chambers being fluidly connected by a variable restricting orifice formed by a gap between an axial bore in the valve disc and a fixed guide rod for the disc. The top of the guide rod acts as a seat for a pilot valve; a lateral bore extends through the top of the guide rod and another through the base of the valve, enabling water to flow into both pressure differential chambers when the main valve outlet is held normally closed against its seat by bias of the diaphragm to prevent backflow under low pressure conditions.
REFERENCES:
patent: 509401 (1893-11-01), Scott
patent: 2318236 (1943-05-01), Layton
patent: 2876981 (1959-03-01), McNown
patent: 3693649 (1972-09-01), Gordon et al.
patent: 3712578 (1973-01-01), Dawson
patent: 4072164 (1978-02-01), Kaden
patent: 4094327 (1978-06-01), Brandelli
patent: 4505450 (1985-03-01), Saarem et al.
patent: 4529002 (1985-07-01), Jacobson
patent: 4911401 (1990-03-01), Holcomb et al.
Lelong Marion P.
Walton George L.
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