Multiple stage pump with multiple external control valves

Details Multiple stage pump with multiple external control valves Multiple stage pump with multiple external control valves

2005-08-23

2005-08-23

Tyler, Cheryl (Department: 3746)

Pumps

With condition responsive pumped fluid control

Plural pump units with individual or relative control

C417S288000, C417S426000, C417S428000, C123S510000, C123S446000

Reexamination Certificate

active

06932583

ABSTRACT:
A multiple stage pump having valves downstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations. The multiple stage pump includes a first pump in a first stage and a second pump in a second stage. At least one valve is downstream from one of the first pump and the second pump in at least one of the first stage and the second stage. A common branch line connects the first stage and the second stage to a common hydraulic system.

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