US PATENT SUBCLASS 137 / 467
.~ Fluid opened valve requiring reset


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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
467.~ Fluid opened valve requiring reset


DEFINITION

Classification: 137/467

(under subclass 455) Apparatus in which a valve opens in response to a change in internal fluid condition and will not return to its closed operative position on removal of the change in condition until a closing or resetting of the valve and/or a trip device is performed by an external operator, usually manually.

SEE OR SEARCH THIS CLASS, SUBCLASS:

62, for valve in which the valve is opened in response to a freeze condition and remains open until reset.

456+, for valves which close in response to condition change and require resetting, and see the search notes to subclass

456.