US PATENT SUBCLASS 137 / 543.13
.~.~.~.~.~ Spring abuts removable valve stem guide

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}
540  DF  .~.~.~.~ Spring coaxial with valve {9}
543.13.~.~.~.~.~ Spring abuts removable valve stem guide

DEFINITION

Classification: 137/543.13

(under subclass 540) Valves wherein the head and spring are on the same side of the seat and the spring abuts a removable guide for the valve stem.