US PATENT SUBCLASS 137 / 504
.~.~.~ Movable deflector or choke

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}
504.~.~.~ Movable deflector or choke

DEFINITION

Classification: 137/504

(under subclass 497) Apparatus in which the separate reactive surface which controls the valve includes a choke, restriction, or deflector, in the fluid flow line and subject

to the flow of fluid, such choke, restriction, or deflector being mounted as to be moved by the fluid proportionally to the rate of fluid flow.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

40+, for flow restrictors in pipes, especially subclasses 43, 45 and 46 for variable restrictors.

251, Valves and Valve Actuation,

120+, for movable or resilient guides or deflectors combined with valves.