In the described submersible pump arrangement, where does water enter the pump?

• A. Through a screen between the pump and motor
• B. Via the discharge outlet
• C. From the water supply via a separate valve
• D. Directly into the impeller housing

Answer: (C)

Water enters on the suction side from the water source, and this flow is controlled by a valve on the supply line. The pump draws water through its inlet on the bottom, passes it into the impeller housing, and then delivers it under pressure through the discharge outlet. The other paths don’t fit because water is not meant to come in via the discharge side, there isn’t a water path through a screen between the motor and pump for intake, and water isn’t injected directly into the impeller housing from an external source without passing through the suction line. The valve on the suction line allows starting, stopping, and regulating flow while the pump remains submerged.