US PATENT SUBCLASS 137 / 487
.~.~.~ Control by pressures across flow line valve

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  DF  .~.~ Responsive to change in rate of fluid flow {1}
487.~.~.~ Control by pressures across flow line valve

DEFINITION

Classification: 137/487

(under subclass 486) Apparatus in which the flow pressure drop across the flow line valve is used to control the flow line valve pilot or servo system.

(1) Note. The main line valve serves as a variable flow line restrictor for deriving a pressure difference proportional to rate of flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

503, for similar flow responsive means in line condition responsive valves having a reactor surface.