US PATENT SUBCLASS 251 / 331
.~ Diaphragm


Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

318  DF  RECIPROCATING VALVE {7}
331.~ Diaphragm


DEFINITION

Classification: 251/331

(under subclass 318) Devices wherein the reciprocating member that opens and closes or controls flow of fluid through the valve consists of a flat or cup shaped member of relatively thin deformable material secured at its periphery to the valve body.

SEE OR SEARCH THIS CLASS, SUBCLASS:

61.2+, for an expansible chamber valve actuator having a flexible wall working member which functions as a valve element to control the flow of fluid through the valve.

SEE OR SEARCH CLASS

137, Fluid Handling,

843+, for resilient material, direct response valves.