US PATENT SUBCLASS 137 / 498
.~.~.~ Valve closes in response to excessive 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  DF  .~.~ Responsive to change in rate of fluid flow {4}
498.~.~.~ Valve closes in response to excessive flow

DEFINITION

Classification: 137/498

(under subclass 497) Apparatus in which the flow controlling valve is closed in response to an increase in the rate of flow beyond a predetermined maximum.

(1) Note. The excessive flow is usually caused by a break in the flow line.

(2) Note. The control mechanism herein, in addition to acting to close the valve in response to an excessive flow may also provide a pressure regulation in which the valve is moved toward closed position at fluid flows above normal but less than the maximum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

460, for safety cut-off valves which are responsive to excessive flow and require resetting.

499, through 504, for fluid flow regulators in which there is not disclosure that the control valve closes in response to an excessive flow.