US PATENT SUBCLASS 137 / 505
.~.~ With opening bias (e.g., pressure regulator)

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.~.~ With opening bias (e.g., pressure regulator) {13}
505.11  DF  .~.~.~> With relief valve
505.12  DF  .~.~.~> Multi-stage
505.13  DF  .~.~.~> Senses inlet pressure
505.14  DF  .~.~.~> Bias variable during operation {3}
505.18  DF  .~.~.~> Balanced valve
505.19  DF  .~.~.~> Liquid level responsive gas flow control
505.2  DF  .~.~.~> With protective separator
505.21  DF  .~.~.~> Main flow through isolated reactor chamber
505.22  DF  .~.~.~> Through external pipe {2}
505.25  DF  .~.~.~> Apertured reactor surface surrounds flow line
505.26  DF  .~.~.~> Reactor surface separated by apertured partition {3}
505.38  DF  .~.~.~> Reactor surface closes chamber {3}
505.47  DF  .~.~.~> With mechanical movement between actuator and valve

DEFINITION

Classification: 137/505

(under subclass 494) Apparatus in which the flow controlling valve is biased toward an open position and a change in fluid condition tends to close the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

224+, for pressure regulators of the tire inflation type.

479+, for biased open valves responsive to pressure differential caused by suction in a combustion engine flow line.

517+, for biased open valves responsive to variations of the fluid pressure acting directly on the valves, and see the search notes to subclass 517.