US PATENT SUBCLASS 417 / 563
.~.~ Similar inlet and discharge distributors of different size or material

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
559  DF  .~ Having pumping chamber pressure responsive distributor {8}
563.~.~ Similar inlet and discharge distributors of different size or material {1}
564  DF  .~.~.~> Annular-type distributors

DEFINITION

Classification: 417/563

(under subclass 559) Apparatus comprising an inlet valve and a discharge valve of substantially the same shape and having substantially the same mode of operation, a first said valve being either greater in some dimension than said second valve or being made of a different material than said second valve.