What type of valve is used for shut-off purposes in a plumbing system?

The ball valve is commonly used for shut-off purposes in plumbing systems due to its design, which allows for a quick and efficient method of stopping or allowing the flow of water. It features a spherical disc, known as a ball, with a hole through its center. When the valve is open, the ball rotates so that the hole is in line with the flow, allowing fluid to pass through. Conversely, when the valve is closed, the ball’s surface seals against the valve body, effectively stopping the flow.

Ball valves are favored for shut-off applications because they offer minimal resistance to flow when open and can be operated quickly with a quarter turn. This makes them ideal for situations where swift closure is required. They also provide a reliable seal, reducing the likelihood of leaks. The durability and ease of operation make ball valves a preferred choice in both residential and industrial plumbing systems.