Geared ball valve

Details Geared ball valve Geared ball valve

1993-10-22

1995-05-23

Fox, John C.

Valves and valve actuation

With means to increase head and seat contact pressure

With positive reduction

251188, F16K 520

Patent

active

054174040

ABSTRACT:
This invention relates to ball valves. One problem with conventional ball valves is that opening and closing the valve causes the valve seal to scrape across the valve seat. This reduces the life of the seal. This scraping problem can be eliminated by retracting the seal from the seat before turning the valve.
In this invention, the ball valve has two coaxial handle assemblies. The outer, lever, assembly turns the valve closure member within its housing. The inner, handwheel, assembly is used independently to retract or extend the valve seal from or to the valve seat. The retraction or extension is achieved by use of a jack-screw shaft which pushes the seal in and out. The jack screw shaft is driven by a series of gears--a first bevel gear, a ring gear, and a second bevel gear--driven by the inner handle assembly. The ball valve is also provided with an inspection port. This port permits inspection, repair, or replacement of the valve seal while the valve is in use in its open position.

REFERENCES:
patent: 2577725 (1951-12-01), Drake
patent: 4273152 (1981-06-01), Freeman
patent: 4634098 (1987-01-01), Varden
patent: 5137258 (1992-08-01), Takamatsu

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