The main difference between single-stage centrifugal pumps and multi-stage centrifugal pumps is their number of impellers, which is referred to as the number of stages in the industrial centrifugal pump industry terminology. As the name suggests, a single-stage pump only has one impeller, while a multi-stage pump has two or more impellers.
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A safety relief valve is an automatic device that protects pressurized systems by releasing excess fluid or gas when internal limits are exceeded