US PATENT SUBCLASS 137 / 527
.~.~ Pivoted valves

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}
527.~.~ Pivoted valves {4}
527.2  DF  .~.~.~> Head retained by removable closure
527.4  DF  .~.~.~> Valve head movably connected for accommodation to seat
527.6  DF  .~.~.~> Valve mounted on end of pipe
527.8  DF  .~.~.~> Weight biased

DEFINITION

Classification: 137/527

(under subclass 511) Valves in which the valve disc or plug swings around the means by which it is mounted in the valve seat or casing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.19, for a pivoted valve and liquid seal means combined.

448, for pivoted valves operated by float drains.

484, for unbalanced pivoted valves of the combustion engine induction type.

520, and 521, for pivoted direct response valves which are biased open.