Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1980-12-30
1983-01-04
Weakley, Harold W.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251161, 251188, F16K 2500
Patent
active
043669468
ABSTRACT:
A ball valve mechanism is provided having an internal movable valve seat element that is positioned for linear movement with respect to a valve ball that is positioned for rotation within the valve body. A mechanism for inducing linear movement to the movable seat element is provided which has the capability of retracting the seat member to allow relatively free rotation of the valve ball element or to force the seat member into sealing engagement with the valve ball with force of sufficient magnitude to induce sealing engagement between the valve ball and a pair of opposed seat surfaces within the valve mechanism. The valve body structure is constructed to facilitate actuation of the linearly movable seat member by an actuator ring that is supported by bearings within an annular groove defined by the valve body structure. The actuator ring has mating threaded engagement with seat drive elements positioned internally of the valve mechanism, which threaded engagement translates rotary motion of the actuator ring into linear motion of the seat drive means and seat element.
REFERENCES:
patent: 2709455 (1955-05-01), Greenwood
patent: 2863629 (1958-12-01), Knox
patent: 3653631 (1972-04-01), Hurst
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