US PATENT SUBCLASS 137 / 505.37
.~.~.~.~.~ With valve closing bias

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}
505.36  DF  .~.~.~.~ Reactor surface is diaphragm {1}
505.37.~.~.~.~.~ With valve closing bias

DEFINITION

Classification: 137/505.37

(under subclass 505.36) Devices in which the valve head is provided with a bias which opposes the opening bias but is of

less strength.