.~.~> Sequentially operated separate relief or bypass passages
DEFINITION
Classification: 417/286
(under subclass 279) Apparatus in which a plurality of pumping units are provided and wherein the fluid flow control means operated in response to a condition or change in condition individually controls the operating characteristics of one unit relative to another and comprises (1) means other than the valving required for the pumping function of such unit or (2) means to operate the necessary valving of a pumping unit in a manner inconsistent with the pumping function of such unit.
(1) Note. To be considered plural pumping units under this definition each unit must operate in or comprise a pumping chamber separate and distinct from the pumping chamber of another unit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
253, for multistage pumps having condition responsive control of at least one of the stages.
270, for three or more cylinders arranged in parallel, radial or conical relationship with rotary transmission axis having condition responsive pumped fluid control.
SEE OR SEARCH CLASS
137, Fluid Handling,
111+, for self-proportioning systems having plural inflows including a flow line from plural pumps.
