Which of the following is an advantage of a single-stage pump?

• A. Simplicity of operations
• B. No transfer valve to malfunction
• C. No confusion on when to switch over
• D. The throttle controls performance

Answer: (A)

With a single-stage pump, water is pumped in one continuous stage from the intake to the discharge. This simple setup means there’s no transfer valve to operate, time, or coordinate, so the operator doesn’t have to juggle switching between stages or worry about when to switch over. The throttle directly controls the pump speed, producing a predictable response in pressure and flow, which makes starting, monitoring, and stopping easier. The absence of a transfer valve and the straightforward flow path reduce the potential for operator error and mechanical issues, giving the overall operation a cleaner, more intuitive feel.