US PATENT SUBCLASS 166 / 332.8
.~.~ Flapper type

Current as of: June, 1999
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166 /   HD   WELLS

316  DF  VALVES, CLOSURES OR CHANGEABLE RESTRICTORS {5}
332.1  DF  .~ Longitudinally movable operator {8}
332.8.~.~ Flapper type

DEFINITION

Classification: 166/332.8

Flapper Type:

(under subclass 332.1) Longitudinally moveable operator wherein the flow regulating device comprises a hinged plate allowing flow in one direction.