US PATENT SUBCLASS 137 / 501
.~.~.~.~ Pressures across fixed choke

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}
501.~.~.~.~ Pressures across fixed choke

DEFINITION

Classification: 137/501

(under subclass 500) Apparatus in which the pressures to which the movable reaction member is subject are taken on opposite sides of a fixed choke or flow restrictor placed in the flow line.

(1) Note. The fixed choke or flow restrictor may be

adjustable, either manually or by a condition unrelated to flow in the line.