US PATENT SUBCLASS 137 / 70
.~.~ Frangible element returns pressure responsive valve

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

67  DF  DESTRUCTIBLE OR DEFORMABLE ELEMENT CONTROLLED {2}
68.11  DF  .~ Destructible element {9}
70.~.~ Frangible element returns pressure responsive valve

DEFINITION

Classification: 137/70

Frangible element returns pressure responsive valve:

(under subclass 68.12) Apparatus in which a valve which opens in response to increased pressure is retained in closed position by means of a frangible element, opening of the valve resulting from the breaking of the frangible element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

455+, for line condition responsive valves not opposed by frangible means.