Check valve with spring loaded clapper assembly
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United States of America Patent
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-
Sep 15, 1992
Grant Date -
N/A
app pub date -
Jan 4, 1991
filing date -
Jan 4, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A check valve assembly adapted for use in a fire protection system includes a housing defining an inlet, an outlet, a seat and a chamber. A clapper or valve element is mounted within the chamber for movement towards and away from the seat. A parallelogram linkage supports the clapper. A pair of draw bars extend diagonally between opposed links. Each draw bar defines a stop. A coil spring encircles the draw bars and engages the stops. Expansion of the coil spring forces the draw bars apart and resiliently biases the clapper or valve element against the valve seat.
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