What type of valve is typically used as a stop valve on a feedwater line?

A gate valve is typically used as a stop valve on a feedwater line because it provides an efficient and effective way to shut off the flow of water completely. The design of a gate valve allows for minimal pressure drop when the valve is fully open, ensuring that the water can flow freely without significant obstruction. When closed, it creates a tight seal that prevents any leakage, which is crucial in maintaining the integrity of the feedwater system.

Additionally, gate valves are suitable for applications where the valve is either fully open or fully closed, such as in a feedwater line where continuous control of water flow is not required. This makes them ideal for isolation purposes. Other types of valves like ball valves, while also capable of providing shut-off function, are typically preferred in scenarios that require frequent operation due to their quicker actuation. Butterfly valves are excellent for regulating flow but may not provide as reliable a seal as gate valves in a completely closed position. Check valves are primarily designed to prevent backflow rather than serve as stop valves.