US PATENT SUBCLASS 137 / 486
.~.~ Responsive to change in rate of fluid flow

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
485  DF  .~ Pilot or servo controlled {3}
486.~.~ Responsive to change in rate of fluid flow {1}
487  DF  .~.~.~> Control by pressures across flow line valve

DEFINITION

Classification: 137/486

(under subclass 485) Apparatus in which the valve is operated in response to the sensing of the velocity of the fluid flow or to the pressure differential along the flow line under flow condition.

(1) Note. This sensing may occur after the valve opens in response to line pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

458, and 459+, for flow responsive valves of the safety cut-off type.

483, for suction flow governor valves of the combustion engine type with a reactor responsive to flow or pressure differential along the line.

497+, for valves with separate connected fluid reactor surface sensing flow either directly or by determining pressure differential or drop along the line.