If the discharge valve on a centrifugal pump is partially closed, what happens to amperage and discharge head?

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Prepare for the ADEQ Wastewater Collections 1 Test. Explore our quiz with multiple choice questions, each with hints and explanations. Gear up for your certification!

Multiple Choice

If the discharge valve on a centrifugal pump is partially closed, what happens to amperage and discharge head?

Explanation:
When you throttle the discharge, you restrict flow through the pump. A centrifugal pump draws more current as it has to push more water against a higher head, so cutting the flow reduces the motor load and amperage. With the valve restriction, the pump ends up operating at a point with less energy transfer to the fluid, so the discharge side pressure (discharge head) is also reduced. In short, partially closing the discharge valve lowers both the current drawn by the motor and the discharge head.

When you throttle the discharge, you restrict flow through the pump. A centrifugal pump draws more current as it has to push more water against a higher head, so cutting the flow reduces the motor load and amperage. With the valve restriction, the pump ends up operating at a point with less energy transfer to the fluid, so the discharge side pressure (discharge head) is also reduced. In short, partially closing the discharge valve lowers both the current drawn by the motor and the discharge head.

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