US PATENT SUBCLASS 137 / 855
.~.~.~.~ Flap or reed

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.~.~.~.~ Flap or reed {3}
856  DF  .~.~.~.~.~> With stop
857  DF  .~.~.~.~.~> With spring
858  DF  .~.~.~.~.~> With weight

DEFINITION

Classification: 137/855

(under subclass 852) Valve wherein the resilient member is fixed at a single location along its periphery and wherein the free portion of the member bends about this location to produce the desired valving action.