Valve with self-expanding seals

Details Valve with self-expanding seals Valve with self-expanding seals

2011-08-02

2011-08-02

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

C251S192000

Reexamination Certificate

active

07988127

ABSTRACT:
A valve device includes a valve body having a cavity, a stopper member in the cavity, and a fluid passage in fluidic communication with the cavity when the valve device is in an open state. A stem is coupled to the stopper member for driving the stopper member to open or close the valve. The stem extends through a stem aperture in the valve body. A first self-expanding seal around the stem is used to seal off an annular gap around the stem. A second self-expanding seal and a third self-expanding seal are disposed around the fluid passage substantially concentrically to prevent leakage. A method for assembling and sealing the valve device, and a valve system are also provided.

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