US PATENT SUBCLASS 137 / 540
.~.~.~.~ Spring coaxial with valve


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.~.~.~.~ Spring coaxial with valve {9}
540.11  DF  .~.~.~.~.~> Broken valve parts retainer
541  DF  .~.~.~.~.~> Spring in inlet
542  DF  .~.~.~.~.~> Valve stem extends through fixed spring abutment {1}
543.13  DF  .~.~.~.~.~> Spring abuts removable valve stem guide
543.15  DF  .~.~.~.~.~> Head slides on guide-rod concentric with spring
543.17  DF  .~.~.~.~.~> Spring guides valve head
543.19  DF  .~.~.~.~.~> Cage-type guide for stemless valves
543.21  DF  .~.~.~.~.~> Guide means integral and coplanar with valve disk
543.23  DF  .~.~.~.~.~> Head between spring and guide


DEFINITION

Classification: 137/540

(under subclass 535) Valves in which the spring is coaxial with the valve.