US PATENT SUBCLASS 417 / 452
.~.~ By separable engageable connecting elements

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
451  DF  .~ Valve element mounted in fixed chamber wall removable with pumping member {1}
452.~.~ By separable engageable connecting elements {1}
453  DF  .~.~.~> Threaded connecting elements

DEFINITION

Classification: 417/452

(under subclass 451) Apparatus in which the means on the valve structure which cooperates with the pumping member comprises portions on both the valve structure and the pumping member that are normally unconnected and are movable into engagement with each other to effect the removal of the valve structure.