US PATENT SUBCLASS 137 / 98
.~ Self-proportioning flow systems

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

87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
98.~ Self-proportioning flow systems {5}
99  DF  .~.~> Interconnected flow displacement elements {1}
100  DF  .~.~> Flow comparison or differential response {3}
101.21  DF  .~.~> Flow displacement element actuates electrical controller
101.25  DF  .~.~> Liquid level response {2}
101.31  DF  .~.~> With measuring type discharge assistant

DEFINITION

Classification: 137/98

(under subclass 87.01) Systems in which the control means maintains a predetermined ratio between flows in a plurality

of flow lines.

(1) Note. The flows may be separate or may subsequently be combined or may be branches from a single source of a fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

561+, particularly subclasses 577+, 599+ and 861+ for devices in which flow is proportioned by means of stationary weirs, overflow pipes, etc., and not having a sensing means.

SEE OR SEARCH CLASS

73, Measuring and Testing, 195+, for rate of flow meter systems employing two or more meters usually for measuring and comparing a plurality of flows.

210, Liquid Purification or Separation,

101, for proportionate feed means combined with separating means.

261, Gas and Liquid Contact Apparatus, appropriate subclass for gas and liquid contact devices including means for maintaining a proportional flow between a gas and liquid; see particularly

69.1+, for systems in which the flow of liquid is controlled in response to the rate of flow in the gas line as measured by means of a venturi in the gas line.