US PATENT SUBCLASS 251 / 357
.~ Removable seat engaging element

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

356  DF  VALVE {5}
357.~ Removable seat engaging element

DEFINITION

Classification: 251/357

(under subclass 356) Subject matter in which the valve is

provided with a readily removable or replaceable sealing element.