US PATENT SUBCLASS 137 / 100
.~.~ Flow comparison or differential response

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

87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
98  DF  .~ Self-proportioning flow systems {5}
100.~.~ Flow comparison or differential response {3}
101  DF  .~.~.~> Flow dividers (e.g., reversely acting controls)
101.11  DF  .~.~.~> Main line flow displaces or entrains material from reservoir
101.19  DF  .~.~.~> With electrical controller

DEFINITION

Classification: 137/100

(under subclass 98) Systems in which the sensing means is sensitive to the differences between the rates of flow or pressure difference along the line in a plurality of flow lines or at spaced points along one line.

(1) Note. Means sensing changes in the difference between the flows may control the flow in a third flow line or may exercise a control on the flows compared.

SEE OR SEARCH THIS CLASS, SUBCLASS:

497+, for line change condition responsive valves controlled by change in the rate of flow, and see the search notes to subclass 497.