Which valve type is primarily used for isolation during fluid flow?

The gate valve is primarily designed for isolation during fluid flow. Its primary function is to either completely stop or allow the full flow of fluid, making it ideal for on/off applications. The gate itself moves up and down to open or close the passage, providing minimal resistance when fully opened, which is essential for maintaining flow efficiency in pipes.

In contrast, other valve types serve different functions. For instance, the ball valve offers quick shut-off capabilities and is used in situations where space is limited or where rapid operation is necessary, but it is not exclusively for isolation. Globe valves are used mainly for throttling flow and providing precise control rather than complete isolation. Check valves, on the other hand, allow flow in one direction only and prevent backflow, but they do not serve as isolation valves. This distinction highlights why the gate valve is the most suitable choice for isolation in fluid systems.