US PATENT SUBCLASS 137 / 506
.~.~ Plural valves biased closed

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}
506.~.~ Plural valves biased closed

DEFINITION

Classification: 137/506

(under subclass 494) Apparatus which include a plurality of biased closed valves responsive to variations in fluid condition, at least one of which utilizes a separate connected reactor surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:

512+, for plural line condition responsive valves of the direct response type.

631+, for cyclic valves or closures and their actuators, and see the search notes to subclass 631.