Steel ball valve

Details Steel ball valve Steel ball valve

1991-12-18

1992-12-08

Fox, John C.

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

251160, F16K 520

Patent

active

051691230

ABSTRACT:
A valve, with a ball having a shaft (5), comprises, at least on the "upstream" side, a seat (14) that can move in the direction in which the fluid flows (F). Seat (14) is connected to body (1) of the valve by an annular membrane (21), constituting a wall of an annular chamber (22) relatively isolated from the "upstream" conditions for example, by a calibrated hole (23). Equilibration means (26) are provided, with a channel (28) and a conduit (29) connecting annular chamber (22) to central volume (27) of the valve, a communication being formed when the valve is opened, thus moving seat (14) away from ball (5). Said communication can be caused to form by control rod (10) of ball (5) when the valve is adjusted for opening.

REFERENCES:
patent: 3912220 (1975-10-01), Vasicek et al.
patent: 4195655 (1980-04-01), Augrburger et al.
patent: 4562992 (1986-01-01), Sugisaki et al.
patent: 4575045 (1986-03-01), Martin

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