(under subclass 321) Apparatus in which the pump has an inlet and outlet for fluid pumped for external use, at least a portion of the fluid either (1) prior to entry to the pump or (2) discharge from said pump outlet, being utilized either immediately or stored for later use, and without further addition of energy, under at least one phase or condition of operation, as a source of motive fluid for a fluid motor which is used to either drive the pump or provide motive power for starting a motor (usually combustion engine) which drives the pump.
(1) Note. In part (2) of the above definition, the pumped fluid must have been discharged from the pump prior to its being used as motive fluid. Therefore, reciprocating expansible chamber pumps which utilized the pressure energy of the fluid existing within the pumping chamber or a chamber in nonvalved continuous communication therewith for reacting on the pumping member itself or a member connected thereto are excluded under this definition even though such an arrangement may be said to assist in driving the pump. Also those devices which permit the pump fluid to continuously apply a force to a reciprocatory-type pumping member are excluded under this definition.
(2) Note. The fluid motor of this definition, due to its particular relationship of receiving motive fluid from the pump which it is driving, will be a mere auxiliary of some other source of pump motivating power (e.g., primary motor, primary motive fluid source, or manual actuator) which may or may not be claimed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
225, for intensifiers of the type which utilize a portion of the pump fluid upstream of the pump for driving the pump motor to raise the remainder of said pump fluid to a higher head.
