US PATENT SUBCLASS 137 / 516.25
.~.~ Plural seating

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
516.25.~.~ Plural seating {1}
516.27  DF  .~.~.~> Sequential {1}

DEFINITION

Classification: 137/516.25

(under subclass 511) Valves comprising a single flow path provided with a plurality of serially arranged sealing surfaces which cooperate with a single head element.

(1) Note. A single sealing surface or head and seat interface comprises a single surface which is either planar or the resulting surface formed by the rotation of either a straight line or a smoothly curved line about the axis of the valved port.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.17, for a plural seating valve combined with liquid seal means.