Which type of valve is commonly used for controlling the flow in both directions?

A ball valve is commonly used for controlling the flow in both directions due to its simple design and functionality. The ball valve features a spherical disc, known as the ball, which has a hole or port that allows fluid to pass when aligned with the flow direction. When the valve is turned, the ball rotates to either open or close the flow path. This mechanism allows for quick operation and excellent sealing properties, making it ideal for applications requiring full flow control in either direction without significant pressure loss.

In contrast, other types of valves, such as gate valves and slide valves, often have limitations in their flow control capabilities or are not designed for bidirectional flow management. Wafer valves are typically used for specific applications and may not provide the same level of versatility as ball valves in controlling flow in both directions.