The internal bypass on a pump is also commonly referred to as a

• A. Relief valve
• B. Bypass valve
• C. Pressure regulator
• D. Safety valve

Answer: (A)

Relieving excess pressure is the job of a relief valve. The internal bypass on a pump opens when discharge pressure gets too high, allowing fluid to bypass the normal path and return, or flow back, to prevent damage. That specific action—opening at a set pressure to relieve buildup—is what defines a relief valve, so it’s the most precise term for this pump feature.

A bypass valve describes generally creating a separate path for flow, but it doesn’t necessarily imply relieving overpressure. A pressure regulator controls downstream pressure, not the pump’s internal overpressure relief. A safety valve is a broader overpressure protection device, often venting to atmosphere or another area, rather than specifically relieving pressure within the pump’s bypass circuit.