US PATENT SUBCLASS 137 / 497
.~.~ Responsive to change in rate of fluid flow

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.~.~ Responsive to change in rate of fluid flow {4}
498  DF  .~.~.~> Valve closes in response to excessive flow
499  DF  .~.~.~> Turbine or swinging vane type reactor
500  DF  .~.~.~> Expansible chamber subject to differential pressures {3}
504  DF  .~.~.~> Movable deflector or choke

DEFINITION

Classification: 137/497

(under subclass 494) Apparatus in which the separate reactive surface which controls the valve is responsive to variations in the rate of flow of fluid through the apparatus or to variations in the pressure differential along the line under flow conditions.

(1) Note. If a valve is described as flow responsive but is equally responsive to static pressure, it is classified on the latter basis. Typical examples of control means responsive to changes in the rate of fluid flow are: (a) a swinging vane or turbine subject to fluid flow, (b) comparison of the pressures or pressure differences across a fixed choke in the flow line or across the throttle valve which regulates the flow; (c) comparison of the pressures or pressure differences at the throat of a Venturi and at a point upstream or downstream from such throat, (d) a deflector subject to fluid flow and movable in a straight line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

10, for processes of fluid handling control by the speed of the flow.

115.03+, for self-controlled branch flow systems in which a by-pass or relief path is controlled by change in rate of main line flow.

220, for Larner-Johnson type valves which are condition responsive.

459+, for safety cut-offs responsive to changes in rate of flow and which require an external reset. 483, for suction flow governor valves of the internal combustion engine type with a reactor responsive to changes in rate of flow or pressure differential along the line as determined under flow conditions.

486+, for pilot or servo controlled valves responsive to variations in rate of flow or pressure differential along the line as determined under flow conditions, the pilot valves being the flow responsive member.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

15+, for valves which compulsorily close after a predetermined time or quantity of flow of fluid, which flow was initiated by other means.