US PATENT SUBCLASS 137 / 496
.~.~ Valve closes in responses to reverse flow


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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
494  DF  .~ With separate connected fluid reactor surface {8}
496.~.~ Valve closes in responses to reverse flow


DEFINITION

Classification: 137/496

(under subclass 494) Apparatus in which the flow controlling valve is disclosed or claimed as being closed in response to the reversal of the fluid flow or to its tendency toward reversal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

106, for self-controlled branched flow systems having reversing valves.

198, for reverse flow stops in discriminating outlets for gas in diverse fluid containing pressure systems.

215+, for back flow prevention by vacuum breaking, especially subclasses 217+ for valved air vents.

239, for cleaning by reversing fluid flow.