OPERATING AND MAINTENANCE MANUAL - …
Jul 17, 2003 · Muscle Pumps 1-5 Two-Stage Pump Operation The primary difference between a single-stage and a two-stage pump is that the former has only one impeller and no transfer valve to switch between volume and pressure operation. A transfer valve is a two-position valve that permits the impellers in a two-stage pump to be operated in parallel (volume)
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