US PATENT SUBCLASS 137 / 251.1
.~ Liquid valves

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.~ Liquid valves {3}
252  DF  .~.~> Branched passage for sealing liquid
253  DF  .~.~> With auxiliary means for varying liquid level
254  DF  .~.~> With baffle

DEFINITION

Classification: 137/251.1

Liquid valves:

(under subclass 247) Apparatus in which the sealing liquid alone performs a valving function in response to either external control means or to fluid pressure in the flow path, i.e., no flow conduit is withdrawn from the liquid to open a flow path.

SEE OR SEARCH THIS CLASS, SUBCLASS:

455+, for line condition responsive valve comprising solid material valve parts.

SEE OR SEARCH CLASS

222, Dispensing,

188, for fluid trap seals for dispenser inlets and outlets, including vents.