US PATENT SUBCLASS 137 / 533.11
.~.~.~.~.~ Ball 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}
528  DF  .~.~ Reciprocating valves {5}
532  DF  .~.~.~ Weight biased {2}
533  DF  .~.~.~.~ Valve body is the weight {2}
533.11.~.~.~.~.~ Ball valves {2}
533.13  DF  .~.~.~.~.~.~> Removable cage
533.15  DF  .~.~.~.~.~.~> Separable seat

DEFINITION

Classification: 137/533.11

(under subclass 533) Valves in which the moving element is substantially spherical.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.21, for a ball valve combined with liquid seal means.

519.5, for normally open ball valves.