US PATENT SUBCLASS 166 / 329
.~.~ Loose ball closure with limited reverse flow

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}
329.~.~ Loose ball closure with limited reverse flow

DEFINITION

Classification: 166/329

(under subclass 319) Devices wherein the valve element comprises a ball that allows full flow in one direction and limited flow in the opposite direction, and closes when the flow in the opposite direction becomes excessive.