US PATENT SUBCLASS 137 / 505.45
.~.~.~.~.~ Yoke has 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}
505.38  DF  .~.~.~ Reactor surface closes chamber {3}
505.44  DF  .~.~.~.~ Valve head on yoke {1}
505.45.~.~.~.~.~ Yoke has valve closing bias

DEFINITION

Classification: 137/505.45

(under subclass 505.44) Devices wherein the valve is urged toward its seat in opposition to the opening bias by a force of less strength.