Buoyant body control device

Details Buoyant body control device Buoyant body control device

1995-10-02

1997-05-20

Walton, George L.

Fluid handling

Liquid level responsive or maintaining systems

With control fluid connection at desired liquid level

137433, 141198, F16K 3122, F16K 3300

Patent

active

056304439

ABSTRACT:
A control device includes a liquid reservoir and a buoyant body movable to either an upper control position or to a lower control position in response to the level of the liquid in the reservoir. The outer surface of the buoyant body includes a cavity circumscribed by a rim engageable with a surface of the reservoir in the lower control position of the buoyant body to define a chamber isolated from the reservoir. A passageway normally connects the chamber to a source of low pressure but is connectible to a source of higher pressure, such that during the filling of the reservoir with the liquid, a low pressure in the chamber normally holds the buoyant body in the lower control position until the chamber is connected by the passageway to the higher pressure to permit the buoyant body to move by buoyancy to the higher control position.

REFERENCES:
patent: 2442927 (1948-06-01), Horvath
patent: 2685301 (1954-08-01), Dreier
patent: 2727527 (1955-12-01), Horvath
patent: 2999509 (1961-09-01), Hankison et al.
patent: 3153247 (1964-10-01), Walsh
patent: 3358704 (1967-12-01), Wyatt et al.
patent: 3495617 (1970-02-01), Zifferer
patent: 4094327 (1978-06-01), Brandelli
patent: 4574826 (1986-03-01), Johnson
patent: 4887635 (1989-12-01), Johnson
patent: 4945944 (1990-08-01), Chen

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