Valve with dual durometer ball seal

Details Valve with dual durometer ball seal Valve with dual durometer ball seal

1992-10-09

1993-12-07

Fox, John C.

Valves and valve actuation

Rotary valves

Ball valve

F16K 506

Patent

active

052677222

ABSTRACT:
A ball valve having a valve body, a ball mounted in the valve body and mounting means for the valve body and the ball whereby the ball may be rotated between an open position allowing flow of fluid through the mounting means, the body and the ball and a closed position preventing such flow. The mounting means is fitted on each side of the ball and body with a seat ring and resilient means urging the seat ring toward the ball and is formed with a pair of grooves encircling the opening in the body. A seal ring is seated in each of such grooves, one such ring being hard and better suited to seal under high pressure, the other ring being softer and better suited to seal under low pressure, and to conform to irregularities in the surface of the ball. Preferably the pair of grooves on each side of the ball have an edge in common and the hard seal ring protrudes from its groove and under pressure deforms the softer ring and augments its sealing function.

REFERENCES:
patent: 3269692 (1966-08-01), Shafer
patent: 3508738 (1970-04-01), Atkinson et al.
patent: 4163544 (1979-08-01), Fowler et al.
patent: 4477055 (1984-10-01), Partridge
patent: 4815701 (1989-03-01), Stone

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