US PATENT SUBCLASS 251 / 330
.~ Actuator controlled stem seal


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

318  DF  RECIPROCATING VALVE {7}
330.~ Actuator controlled stem seal


DEFINITION

Classification: 251/330

(under subclass 318) Devices in which leakage about the valve operating stem is prevented by the engagement of a valve head-like structure carried either by the stem or by the valve head which engages a seat-like structure carried by the valve body when the main valve is opened.

SEE OR SEARCH THIS CLASS, SUBCLASS:

214, for valves having mechanical movement actuators particularly packed.