US PATENT SUBCLASS 137 / 246.22
.~.~ External pressure

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}
246.22.~.~ External pressure

DEFINITION

Classification: 137/246.22

(under subclass 246) Valves wherein the sealing material is introduced into the valve under pressure from some means such as a grease gun or oil pump.