A two-way ball valve is a type of valve that is used to control the flow of liquids or gases in a system. It is composed of a spherical body with two openings, one for inlet and one for outlet. The valve is opened and closed by a handle or lever, which is connected to a ball inside the valve. The ball has a hole drilled through it, which allows the flow of the liquid or gas when the valve is open. When the valve is closed, the ball blocks the flow of the liquid or gas. Two-way ball valves are commonly used in plumbing and HVAC systems to control the flow of water or air. They are also used in industrial applications, such as oil and gas pipelines, to control the flow of oil or gas. Two-way ball valves are highly reliable and easy to maintain, making them a popular choice for many applications.