US PATENT SUBCLASS 137 / 542
.~.~.~.~.~ Valve stem extends through fixed spring abutment

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}
542.~.~.~.~.~ Valve stem extends through fixed spring abutment {1}
543  DF  .~.~.~.~.~.~> Yoke or cage-type support for valve stem

DEFINITION

Classification: 137/542

(under subclass 540) Valves in which the valve has a stem which passes through the biasing spring, which is mounted between abutments one of which is fixed and comprises a guide for the stem and the other of which is carried by or comprised in the valve head and/or stem.

SEE OR SEARCH THIS CLASS, SUBCLASS:

541, for valves of this type in which the spring is in contact with the pressure fluid, the spring and valve head being on opposite sides of the valve seat.