Ball valve

Details Ball valve Ball valve

1986-01-06

1987-06-30

Weakley, Harold W.

Valves and valve actuation

With means to increase head and seat contact pressure

With positive reduction

251163, 251174, F16K 2500

Patent

active

046764801

ABSTRACT:
A ball valve comprising a valve body defining inlet and outlet sections, and a ball with a calibrated through-port. The valve further comprises a stem to rotate the ball between open and closed positions, a seal to insure a fluid tight closure of the valve when the ball is in the closed position, and a mechanism for retracting the seal. This seal retracting mechanism is selectively coupled to the stem, and the mechanism eliminates all contact, when the valve is in the open position, (i) between the ball and the seal, and (ii) between the stem and the seal retracting mechanism.

REFERENCES:
patent: 2661926 (1953-12-01), Resek
patent: 2883147 (1959-04-01), Mirza
patent: 3033237 (1962-05-01), Belford
patent: 3245653 (1966-04-01), Lavigueur
patent: 3485475 (1969-12-01), Moore
patent: 3960363 (1976-06-01), Domyan
patent: 4332267 (1982-06-01), Evans

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