US PATENT SUBCLASS 137 / 246.18
.~.~.~.~ Jacking

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

237  DF  WITH CLEANER, LUBRICATION ADDED TO FLUID OR LIQUID SEALING AT VALVE INTERFACE {2}
246  DF  .~ Liquid supplied at valve interface {8}
246.15  DF  .~.~ Screw feed {3}
246.16  DF  .~.~.~ With check valve {2}
246.18.~.~.~.~ Jacking

DEFINITION

Classification: 137/246.18

(under subclass 246.16) Valves wherein the valve is lifted from its seat to aid actuation by the pressure of the

lubricant.