US PATENT SUBCLASS 137 / 502
.~.~.~.~ With Venturi tube having a connection to throat

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}
502.~.~.~.~ With Venturi tube having a connection to throat

DEFINITION

Classification: 137/502

(under subclass 500) Apparatus in which the pressures to which the movable reaction member is subject are taken at the throat of a Venturi placed in the flow line and at another point upstream or downstream of said throat.

SEE OR SEARCH THIS CLASS, SUBCLASS:

219+, for Larner-Johnson hydraulic valves, which are located at a point of line restriction.

SEE OR SEARCH CLASS

73, Measuring and Testing,

861.63+, for meters of the Venturi type.

251, Valves and Valve Actuation, 24, for fluid actuated or retarded valves with Venturi assisting means, and subclasses 123+ for a valve located at a point of restriction in the line.