US PATENT SUBCLASS 417 / 517
.~.~.~.~ Element forms both inlet and discharge distributor

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
510  DF  .~ Mechanically actuated distributor {5}
515  DF  .~.~ Plural pumping chambers {1}
516  DF  .~.~.~ Common element forms inlet or discharge distributor for plural chambers {1}
517.~.~.~.~ Element forms both inlet and discharge distributor

DEFINITION

Classification: 417/517

(under subclass 516) Apparatus in which the unitarily movable valve element controls both the inlet and discharge of pump fluid to and from two or more pump chambers.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type,

472+, for pumps or motors comprising three or more cylinders arranged in parallel, radial, or conical relationship with a rotary transmission axis and in which motive or pump fluid flow is usually controlled by a single, unitary, mechanically actuated valve element. For the line between Class 91 and Class 417 concerning this type of pump, see the note in Class 417 subclass 269.