Under a no flow condition, the ______ discharges water to keep the pump cool.

Under a no flow condition, the ______ discharges water to keep the pump cool.

• A. bypass line
• B. drain
• C. check valve
• D. relief valve

Answer: (D)

When a pump runs but there’s no water being used elsewhere, it can overheat because there’s little or no flow through the pump. A relief valve provides a controlled exit path for water in the discharge line, opening as needed to relieve pressure and bleed water away. That discharge helps carry heat away from the pump, keeping it cool even under no-flow conditions. The other options don’t provide this cooling through an intentional discharge: a drain isn’t active cooling, a check valve blocks flow, and a bypass line doesn’t specifically discharge to allow cooling.

When a pump runs but there’s no water being used elsewhere, it can overheat because there’s little or no flow through the pump. A relief valve provides a controlled exit path for water in the discharge line, opening as needed to relieve pressure and bleed water away. That discharge helps carry heat away from the pump, keeping it cool even under no-flow conditions. The other options don’t provide this cooling through an intentional discharge: a drain isn’t active cooling, a check valve blocks flow, and a bypass line doesn’t specifically discharge to allow cooling.