(under subclass 437) Apparatus comprising a single pump chamber having a plurality of outlet passages for pumped fluid, each of said outlet passages being individually, cyclically controlled and either (1) delivering to separate destinations, or (2) if delivering to a common destination, the control means having different modes of operation or operating at different times in the pump cycle.
(1) Note. For purposes of this definition, cyclic control of the outlet passages is not limited to control which is effected during each stroke of a reciprocating pumping member and includes control which is effected after a predetermined number of strokes of the pumping member.
(2) Note. A bypass of pumped fluid back to supply or to waste is considered to be an outlet under this definition including those in which the bypass is downstream of the cyclic outlet from the pump chamber. However, a passage through which pumped fluid is delivered to a portion of the pump assembly (e.g., bearing) and is utilized for an ancillary purpose of the pump such as cooling or lubricating of a pump such as cooling or lubricating of a pump part is not considered to be an outlet under this definition.
(3) Note. A pump chamber having one outlet through a valve in a piston operating therein and another outlet through a valve not in the piston is intended to form subject matter under this definition, said valves being considered as having different modes of operation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
251+, for successive stage pumps having a pump fluid discharge path intermediate of the pumping stages. 493+, for plural controlled inlet or outlet flow paths, the control of at least one of said paths being effected by a pumping member controlled port.
