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

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

Current as of: June, 1999
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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.