Ball valve

Details Ball valve Ball valve

1990-11-02

1991-10-01

Walton, George L.

Valves and valve actuation

With means to increase head and seat contact pressure

With positive reduction

166324, 251172, 251174, 251283, 251315, 251316, F16K 506, F16K 2500

Patent

active

050526570

ABSTRACT:
A kelly valve includes a ball valve structure (10) having a ball valve member (40) with a central bore (42) therethrough mounted within a valve chamber (38) for rotation between open and closed positions. A fluid pressure equalizing opening or port (60) is provided in the quadrant of the ball valve member (40) exposed to the upstream flow passage (20) in closed position (FIG. 2) and exposed to the valve chamber (38) in open position (FIG. 1) thereby making the ball valve member (40) easy to rotate manually even at high downstream fluid pressures.

REFERENCES:
patent: 3542335 (1970-11-01), Scaramucci
patent: 3667505 (1972-06-01), Radig
patent: 3741249 (1973-06-01), Leutwyler
patent: 3826462 (1974-07-01), Taylor
patent: 3850242 (1974-11-01), Crowe
patent: 3868995 (1975-03-01), Crowe
patent: 3901321 (1975-08-01), Mott
patent: 3993136 (1976-11-01), Mott
patent: 4103744 (1978-08-01), Akkerman
patent: 4423749 (1984-01-01), Schmitt
patent: 4448216 (1984-05-01), Speegle et al.

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