US PATENT SUBCLASS 137 / 536-- .~.~.~.~ With means to protect spring from fluid

US PATENT SUBCLASS 137 / 536
.~.~.~.~ With means to protect spring from fluid

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}
528	DF	.~.~ Reciprocating valves {5}
535	DF	.~.~.~ Spring biased {5}
536		.~.~.~.~ With means to protect spring from fluid

DEFINITION

Classification: 137/536

(under subclass 535) Valves provided with means preventing or reducing the impingement of the pressure fluid on the spring, usually a flexible wall, deflecting baffles or a telescoping enclosure for the spring.

SEE OR SEARCH THIS CLASS, SUBCLASS:

790, for expansible chamber devices with additional biasing means.

793+, for diaphragms and bellows, per se.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation, 335.1, for valves provided with a hermetic flexible wall seal which separates the valve actuator from the controlled fluid.