US PATENT SUBCLASS 137 / 539.5
.~.~.~.~.~ With follower

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}
535  DF  .~.~.~ Spring biased {5}
539  DF  .~.~.~.~ Ball valves {1}
539.5.~.~.~.~.~ With follower

DEFINITION

Classification: 137/539.5

(under subclass 539) Valves wherein a follower (e.g., reciprocating rod) is interposed between the spring and the ball.