US PATENT SUBCLASS 137 / 505.27
.~.~.~.~ In valve stem

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
494  DF  .~ With separate connected fluid reactor surface {8}
505  DF  .~.~ With opening bias (e.g., pressure regulator) {13}
505.26  DF  .~.~.~ Reactor surface separated by apertured partition {3}
505.27.~.~.~.~ In valve stem {1}
505.28  DF  .~.~.~.~.~> Also through reactor surface

DEFINITION

Classification: 137/505.27

(under subclass 505.26) Devices in which the passage to the reactor surface chamber is through the valve stem.