US PATENT SUBCLASS 137 / 493.4
.~.~.~.~ Spring stop on supported valve stem

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
493  DF  .~ Bi-directional flow valves {4}
493.1  DF  .~.~ One head and seat carried by head of another {3}
493.3  DF  .~.~.~ Supporting valve spring carried by supporting valve {2}
493.4.~.~.~.~ Spring stop on supported valve stem

DEFINITION

Classification: 137/493.4

(under subclass 493.3) Apparatus wherein the spring of the carried valve abuts a stop (e.g., a collar) on the carried valve stem.