US PATENT SUBCLASS 137 / 466
.~.~.~ With fluid pressure seating of valve

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
456  DF  .~ Safety cut-off requiring reset {7}
464  DF  .~.~ Fluid counter-biased or unseated valve {2}
466.~.~.~ With fluid pressure seating of valve

DEFINITION

Classification: 137/466

(under subclass 464) Apparatus in which the incoming pressure urges the cut-off valve toward its seat or holds it closed after the valve has closed in response to the decrease in pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

462, for this type of safety cut-off valves including pressure equalization valves or by-passes or venting valves for resetting the valve.