US PATENT SUBCLASS 137 / 246.21
.~.~ Spring biased piston feed

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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}
246.21.~.~ Spring biased piston feed

DEFINITION

Classification: 137/246.21

(under subclass 246) Valves wherein the lubricant feed means is a spring biased piston.