US PATENT SUBCLASS 137 / 247.15
.~.~.~ Line condition change responsive

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

247  DF  WITH LIQUID VALVES OR LIQUID TRAP SEALS {3}
247.11  DF  .~ Liquid seal in liquid flow line; flow liquid forms seal {8}
247.13  DF  .~.~ Valves {1}
247.15.~.~.~ Line condition change responsive {3}
247.17  DF  .~.~.~.~> Plural valves or valve seats
247.19  DF  .~.~.~.~> Pivoted valve
247.21  DF  .~.~.~.~> Ball valve {1}

DEFINITION

Classification: 137/247.15

(under subclass 247.13) Apparatus in which the valve is responsive to a change in the condition of the liquid in the flow line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

386+, for liquid level responsive valves where no liquid seal is present, and particularly subclasses 409+ for float controlled valves.

455+, for other line condition change responsive valves.