US PATENT SUBCLASS 137 / 519.5
.~.~.~.~ 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}
517  DF  .~.~ Biased open {3}
519  DF  .~.~.~ Weight biased {2}
519.5.~.~.~.~ Ball valves

DEFINITION

Classification: 137/519.5

(under subclass 519) Valves wherein the moving element is substantially spherical.

SEE OR SEARCH THIS CLASS, SUBCLASS:

533.11, for normally closed ball valves.