US PATENT SUBCLASS 417 / 521
.~ Plural pumping chambers

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
521.~ Plural pumping chambers {7}
522  DF  .~.~> Discharge conduit for first chamber communicates with nonpumping portion or second pumping member
523  DF  .~.~> Including valved piston {5}
531  DF  .~.~> Unitary or interconnected elements form inlet or discharge distributors for plural chambers {1}
533  DF  .~.~> Common discharge conduit interposed between spaced parallel chambers
534  DF  .~.~> Chambers formed at opposite ends of rectilinearly moving pumping member {1}
538  DF  .~.~> Inlet and discharge distributors at adjacent end of aligned chambers
539  DF  .~.~> Parallel laterally spaced relatively movable pumping members

DEFINITION

Classification: 417/521

(under subclass 437) Apparatus comprising two or more pumping chambers.

(1) Note. A device in which fluid is moved from one side of a pumping member to the opposite side thereof during movement of the pumping member in one direction of its stroke and then lifted out of the chamber during movement of the pumping member in the second direction of its stroke is not considered plural chambers and is excluded from this subclass.

(2) Note. A pump including a plurality of pumping members acting upon a body of fluid, and in which the fluid acted upon by a first pumping member is in communication with the fluid acted upon by a second pumping member in all operative conditions of the pump, is not considered as constituting plural chambers and is excluded from this subclass. Such subject matter is classified below on other features.

SEE OR SEARCH THIS CLASS, SUBCLASS:

244+, for a successive stage pump.

473, for plural bellows-type pumping chambers. 480, for a pump in which the fluid is moved from one side of a flexible wall pumping member to the other through a valved port in said flexible wall pumping member.

486+, for plural pumping members in one chamber having a single inlet or discharge distributor.

491, for plural pumping chambers in which the inlet or exhaust to each chamber is controlled by a pumping member which is common to all pumping chambers.

515, for plural pumping chambers in which the inlet or discharge valve for the chambers is mechanically actuated.

545+, for a pump in which fluid is moved from one side of a pumping member to the other through a valved port in the pumping member.

555.1, for fluid serially moved to opposite sides of a common pumping member.