When variations in capacity and pressure are required beyond those that can conveniently be obtained from a single impeller, then multi-stage series/parallel pumps are used. These pumps have two or more impellers, each enclosed in its own volute, that are usually part of a common body. With a two-stage pump, a transfer valve is located at the outlet of the first-stage volute. It directs the water either to pump discharge VOLUME (parallel) position, or to second-stage intake PRESSURE (series) position, depending on the pump performance desired.
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When the transfer valve is in VOLUME (parallel) position, the water enters each impeller eye from a common intake and leaves through a common pump discharge.
If the transfer valve is moved to PRESSURE (series) position, the first-stage pumps its full volume and pressure directly to the second-stage intake instead of to pump discharge. The second-stage then pumps this same volume of water to pump discharge, but at approximately twice the first-stage pressure. With the transfer valve in this position, first-stage discharge pressure closes the flap valves in the side intake passageways that prevent water from bypassing back to the first-stage intake passageway.
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A multistage centrifugal pump is characterized by several impellers arranged in series. The flow is directed from the outlet of one stage to the inlet of the next, so that the total head of a multistage pump is the sum of the individual stages. Due to the series and multi-stage arrangement, the head of the centrifugal pump can be increased. Are you looking for a multistage centrifugal pump? CP has many years of cooperation in this field.
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