US PATENT SUBCLASS 137 / 858
.~.~.~.~.~ With weight

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
843  DF  .~.~ Resilient material valve {4}
852  DF  .~.~.~ With valve member flexing about securement {4}
855  DF  .~.~.~.~ Flap or reed {3}
858.~.~.~.~.~ With weight

DEFINITION

Classification: 137/858

(under subclass 855) Valve which, in addition to the restoring force of the resilient material is provided with a mass of material which due to the force of gravity acts to bias the resilient member towards its valve seat.