In a dual-stage pump, during which operation does water not recirculate and is forced into the eye of the second stage to increase pressure?

In a dual-stage pump, during which operation does water not recirculate and is forced into the eye of the second stage to increase pressure?

• A. Pressure
• B. Volume
• C. Draft
• D. Idle

Answer: (A)

In a dual-stage pump, increasing the discharge pressure is achieved by pushing water into the eye of the second stage. When operating in the pressure mode, the system directs the water that would otherwise recirculate back through the first stage and instead forces it into the second stage inlet, where it gains additional head and raises the overall pressure at the discharge. This contrasts with the volume mode, which prioritizes higher flow at lower pressure; draft relates to drawing water from a source, and idle means the pump isn’t pumping.

In a dual-stage pump, increasing the discharge pressure is achieved by pushing water into the eye of the second stage. When operating in the pressure mode, the system directs the water that would otherwise recirculate back through the first stage and instead forces it into the second stage inlet, where it gains additional head and raises the overall pressure at the discharge. This contrasts with the volume mode, which prioritizes higher flow at lower pressure; draft relates to drawing water from a source, and idle means the pump isn’t pumping.