US PATENT SUBCLASS 137 / 460
.~.~.~ Excessive flow cut-off


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
456  DF  .~ Safety cut-off requiring reset {7}
459  DF  .~.~ Responsive to change in rate of flow {1}
460.~.~.~ Excessive flow cut-off


DEFINITION

Classification: 137/460

(under subclass 459) Apparatus in which the valve closes in response to an increased velocity beyond a predetermined value.

(1) Note. Many of the patents classified in this subclass close in response to excess velocity occasioned by a break in the line beyond the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

57, for excess speed responsive valve control, and see the search notes thereto.

498, for valves having separate reactor surfaces and closing in response to excess velocity but not requiring reset.