US PATENT SUBCLASS 137 / 118.03
.~.~.~ Biased open isolation valve

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

87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
109  DF  .~ Self-controlled branched flow systems {4}
118.01  DF  .~.~ Plural outflows {5}
118.03.~.~.~ Biased open isolation valve

DEFINITION

Classification: 137/118.03

Biased open isolation valve:

(under subclass 118.01) Subject matter comprising an outlet valve in each outflow and wherein each outlet valve is held open in the absence of a fluid pressure by a flexibly adjustable device (e.g., a weight of the valve body itself, or a spring) and at least one valve closes in response to a sudden pressure drop or flow increase in the outlet line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

458, through 466, for valves on a single line (one inlet and one outlet) serving the same purpose, but requiring reset.

498, and 517+, for valves on a single line that are biased open and shut when the downstream line has a sudden pressure drop.

SEE OR SEARCH CLASS

303, Fluid-Pressure Brake and Analogous Systems,

84.2, for a flow retarding isolation valves.