US PATENT SUBCLASS 166 / 332.7
.~.~ Having equalizing valve

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}
332.7.~.~ Having equalizing valve

DEFINITION

Classification: 166/332.7

Having equalizing valve:

(under subclass 332.1) Longitudinally moveable operator including a flow regulating portion that allows pressure inside the tool to be the same as pressure outside the tool.

SEE OR SEARCH THIS CLASS, SUBCLASS:

324, for a fluid operated valve with fluid pressure equalizing means.