What type of valve is typically used to isolate a pump on the suction side?

The choice of using a gate valve to isolate a pump on the suction side is based on its functional characteristics. Gate valves are designed to provide full fluid flow with minimal pressure drop when fully open, making them ideal for isolating sections of a system, such as on the suction side of a pump.

When the gate valve is open, it allows for smooth flow with essentially no obstruction, which is crucial for maintaining the efficiency of the pump operation. Furthermore, gate valves are particularly effective where a straight-line flow of fluid and minimal turbulence is required, ensuring that the pump can draw in water easily without causing cavitation or pressure fluctuations.

In contrast, other types of valves like ball valves and butterfly valves, while also capable of isolation, may not provide the same level of flow efficiency or can introduce more turbulence in the system when partially open. Check valves serve a different purpose by preventing backflow and are not designed for isolation. Therefore, a gate valve is the most suitable option for isolating a pump on the suction side.