US PATENT SUBCLASS 137 / 454.4
.~ Pump type

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

454.2  DF  REMOVABLE VALVE HEAD AND SEAT UNIT {3}
454.4.~ Pump type

DEFINITION

Classification: 137/454.4

(under subclass 454.2) Devices which are designed to be used as inlet or outlet valves, or both, of fluid compressors or pumps.

SEE OR SEARCH CLASS

417, Pumps,

454, for an expansible chamber type pump having means for facilitating assembly or disassembly of a pump valve to or from the pump.