US PATENT SUBCLASS 137 / 513-- .~.~.~ Mechanically interconnected

US PATENT SUBCLASS 137 / 513
.~.~.~ Mechanically interconnected

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

455	DF	LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511	DF	.~ Direct response valves (i.e., check valve type) {14}
512	DF	.~.~ Plural {6}
513		.~.~.~ Mechanically interconnected

DEFINITION

Classification: 137/513

(under subclass 512) Apparatus in which there is a mechanical interconnection between two of the valves such that the movement of one valve relative to its seat in response to variation in the line condition is transmitted to the other thereby to move it relative to its seat.

SEE OR SEARCH THIS CLASS, SUBCLASS:

493+, for valve means oppositely acting to open for either excessive pressures or pressures below standard.

494+, for condition responsive valves having a reactor surface which is not primarily a valve, though it may have the effect of a variable restrictor.