US PATENT SUBCLASS 137 / 500
.~.~.~ Expansible chamber subject to differential pressures

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.~.~.~ Expansible chamber subject to differential pressures {3}
501  DF  .~.~.~.~> Pressures across fixed choke
502  DF  .~.~.~.~> With Venturi tube having a connection to throat
503  DF  .~.~.~.~> Pressures across flow line valve

DEFINITION

Classification: 137/500

(under subclass 497) Apparatus in which the valve is operated by a movable reaction member such as a piston or diaphragm working in an expansible chamber under the influence of two pressures taken at spaced points in the flow line which vary as a function of the rate of fluid flow through the line.

(1) Note. The movable reaction member mentioned above may be integral with the controlling valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

777+, for expansible chamber devices, per se.

SEE OR SEARCH CLASS

73, Measuring and Testing,

861.42+, for pressure differential type meters.