US PATENT SUBCLASS 137 / 505.42
.~.~.~.~.~ 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}
505.38  DF  .~.~.~ Reactor surface closes chamber {3}
505.39  DF  .~.~.~.~ Valve head in inlet chamber {3}
505.42.~.~.~.~.~ With valve closing bias {1}
505.43  DF  .~.~.~.~.~.~> In reactor chamber

DEFINITION

Classification: 137/505.42

(under subclass 505.39) Devices in which the valve is urged towards its seat in opposition to the opening bias.

(1) Note. The stem is usually not attached to the reactor surface, hence a valve returning force is required when fluid pressure moves the reactor surface from the stem.