US PATENT SUBCLASS 137 / 494
.~ With separate connected fluid reactor surface

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
494.~ With separate connected fluid reactor surface {8}
495  DF  .~.~> With manual or external control for line valve
496  DF  .~.~> Valve closes in responses to reverse flow
497  DF  .~.~> Responsive to change in rate of fluid flow {4}
505  DF  .~.~> With opening bias (e.g., pressure regulator) {13}
506  DF  .~.~> Plural valves biased closed
507  DF  .~.~> With means for mounting or connecting to system
508  DF  .~.~> Valve seat or external sleeve moves to open valve
509  DF  .~.~> Valve seating in direction of flow {1}

DEFINITION

Classification: 137/494

(under subclass 455) Apparatus in which a flow controlling valve is connected to a separate movable nonvalving surface so as to be operated thereby, the fluid flowing in the apparatus and being controlled by the valve reacting on said surface, which moves in response to variations in fluid condition in the apparatus, the motion being transmitted to the valve.

(1) Note. The separate reactor surface may be integral with the valving surface, as for example, in a valve with a surface greater than that necessary to provide its valving function, where the excess surface is subject to the pressure of the flowing material and acts as a reactor surface to operate or to assist in the operation of the valve.

(2) Note. Surfaces which are subject to the line fluid for the purpose of retarding the operation of a valve (e.g., dashpots) are not treated as separate reactor surfaces. See search notes below to subclass 514.

SEE OR SEARCH THIS CLASS, SUBCLASS:

458, for safety cut-off valves requiring reset which are responsive to both high and low pressure or velocity.

461, for safety cut-off valves requiring reset which are beyond a maximum. 469+, for pop valves in which the initial flow of fluid after opening in response to fluid pressure reacts against a surface to effect the further opening or the closing operation.

479+, for governor valves which respond proportionally to induction pressures in internal combustion engines.

511+, for valves which respond to variations in fluid conditions acting directly on the valves, per se, especially subclass 513 for plural direct responsive valves mechanically connected, in which one valve may have an actuating effect on another, and subclass 514 for line condition direct responsive valves having dashpots using line fluid.

613+, for distribution systems comprising plural valves arranged in series in the flow line wherein manual or external means operate one valve which causes a change in the condition in the flow line in order to utilize such changed condition to effect automatic operation of the other valve in the flow line, i.e., for systems not primarily condition change responsive, which involve such response means incidentally.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

15+, for valves which are closed by fluid flow reacting means after an interval having been opened by other external means.