US PATENT SUBCLASS 166 / 87.1
.~.~ Axially movable type valve

Current as of: June, 1999
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166 /   HD   WELLS

75.11  DF  ABOVE GROUND APPARATUS {25}
86.1  DF  .~ Inner member anchor or seal with valve {3}
87.1.~.~ Axially movable type valve

DEFINITION

Classification: 166/87.1

Axially movable type valve:

(under subclass 86.1) Inner member seal with valve comprising a flow regulating device which is movable in the direction of the axis of a pipe in order to control fluid flow in the pipe.