Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1991-01-10
1993-04-27
Fox, John C.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251161, 251194, F16K 314
Patent
active
052055353
ABSTRACT:
An expanding gate valve assembly which includes a gate, a stem for actuating the gate, a segment mounted on one side of the gate, or in an alternate, bidirectional embodiment, two segments with one segment movably mounted on each opposite side of the gate for movement toward seating surfaces within the valve body. Each segment carries two spaced, parallel wedging-camming surfaces which are of a configuration to cooperate with complementary spaced, parallel wedging-camming surfaces on the gate to effect lateral expansion of the segment or segments during closure or opening of the valve. The spacing of the wedging-camming surfaces or legs is such that the movable segments are stably supported during their expansion movement.
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Fox John C.
McCarthy Bill D.
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