Self compensating seat for a spherical plug valve

Details Self compensating seat for a spherical plug valve Self compensating seat for a spherical plug valve

1976-06-01

1978-01-03

Weakley, Harold W.

Valves and valve actuation

With means to increase head and seat contact pressure

Fluid pressure

251185, F16K 2500

Patent

active

040662403

ABSTRACT:
A ball or spherical plug valve has a pair of annular seal rings with outer peripheral portions thereof mounted in contact with the valve chamber end walls and inner annular edge portions thereof in sealing contact with the ball member and in a spaced relation to the end walls when the ball member has not been displaced by fluid pressure. Each seal ring has a substantially sharp inner edge portion contacting the ball member in substantially a line contact with the ball member when the ball member has not been displaced by fluid pressure. Each seal ring has a substantially flat inner side portion adjacent to the substantially sharp edge portion and the ball member. Upon closing of the valve against line pressure, the ball member is displaced downstream and the downstream seal ring is deformed with the inner peripheral portion thereof moved into face-to-face contact with the adjacent end wall, and the flat side portion moved into contact with the ball member to provide a relatively large contact area between the surface of the ball member and the downstream seal ring with the downstream seal ring stationary.

REFERENCES:
patent: 2890856 (1959-06-01), Clade
patent: 2942840 (1960-06-01), Clade
patent: 3047007 (1962-07-01), Lunken
patent: 3371907 (1968-03-01), Scaramucci
patent: 3841347 (1974-10-01), Kuskida

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