US PATENT SUBCLASS 166 / 326
.~.~.~ Flexible valve element

Current as of: June, 1999
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166 /   HD   WELLS

316  DF  VALVES, CLOSURES OR CHANGEABLE RESTRICTORS {5}
319  DF  .~ Fluid operated {4}
325  DF  .~.~ One way, e.g., check valve type {2}
326.~.~.~ Flexible valve element

DEFINITION

Classification: 166/326

(under subclass 325) Devices in which a part of the valve comprises a flexible valve element.