What type of valve is commonly found on the discharge side of a large pump?

The gate valve is commonly found on the discharge side of a large pump because it is designed to provide a full flow or no flow condition, making it ideal for on/off service in high flow systems. When completely opened, a gate valve allows for minimal pressure drop and unobstructed flow, essential in pump discharge applications where efficiency is crucial.

Moreover, gate valves are generally more suitable for applications that require a valve to remain either fully open or fully closed rather than throttling, which aligns with the operational needs of a large pump. The ability to isolate the pump for maintenance or emergency procedures without causing significant turbulence in the system further enhances the gate valve's utility in this context.

The other choices serve different purposes: ball valves offer quick on/off control but can create more turbulence when partially open, check valves prevent backflow but are not suitable for isolation, and pressure relief valves are utilized for safety to manage excessive pressure rather than flow control. Hence, the characteristics of a gate valve make it the preferred option for the discharge side of large pumps.