Ball valve assembly

Details Ball valve assembly Ball valve assembly

1979-05-24

1981-10-06

Pate, III, William F.

Wells

Valves, closures or changeable restrictors

Rotated operator

166332, 251172, 251174, E21B 3412

Patent

active

042930383

ABSTRACT:
An improved mounting and sealing assembly is provided for a rotating ball valve required to open under increased differential pressures and close against high flow rates. The valve assembly includes a trunnion-mounted ball and two pressure biased sealing assemblies. The primary seal constitutes an elastomeric seal element which is axially shiftable into engagement with the ball, and the secondary seal comprises a metallic element which is also axially shiftable relative to the ball. To open the valve, the seals are moved in sequence axially away from the ball and the hydraulic seal is fully broken before the ball is rotated. In closing, the ball is rotated to its closed position and the seals then moved axially in sequence into contact with the ball.

REFERENCES:
patent: 3821494 (1974-08-01), Crowe
patent: 3901321 (1975-08-01), Mott
patent: 4114639 (1978-09-01), Cross

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