US PATENT SUBCLASS 137 / 503
.~.~.~.~ 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}
494  DF  .~ With separate connected fluid reactor surface {8}
497  DF  .~.~ Responsive to change in rate of fluid flow {4}
500  DF  .~.~.~ Expansible chamber subject to differential pressures {3}
503.~.~.~.~ Pressures across flow line valve

DEFINITION

Classification: 137/503

(under subclass 500) Apparatus in which the pressures to which the movable reaction member is subject are taken on opposite sides of the throttle valve which is operated by the reaction member and which valve regulates the fluid flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

487, for pilot or servo-controlled line condition responsive valves in which control is by differential pressures across the flow line valve.