US PATENT SUBCLASS 137 / 253
.~.~ With auxiliary means for varying liquid level

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

247  DF  WITH LIQUID VALVES OR LIQUID TRAP SEALS {3}
251.1  DF  .~ Liquid valves {3}
253.~.~ With auxiliary means for varying liquid level

DEFINITION

Classification: 137/253

(under subclass 251) Apparatus including auxiliary means independent of the flow path for adjusting or varying the height of the liquid in the valve.