Ball Valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball to control flow through it. Stainless steel ball valve is open when the ball’s hole is in line with the flow and closed when it is pivoted 90 degrees by the valve handle. Floating thread ball valve handle lies flat in alignment with the flow when open, and is perpendicular to it when closed, making for easy visual confirmation of the 1PC ball valve’s status.

Ball Valve is convenient to open & close fully. Ball valve has distinct features, like small volume, reliable sealing performance, simple structure, convenient maintenance and high corrosion resistance. 1PC stainless steel reduce bore ball valve can used in water, oil, natural gas and some corrosion liquid, etc. 

A full port or more commonly known full bore ball valve has an over-sized ball so that the hole in the ball is the same size as the pipeline resulting in lower friction loss. Flow is unrestricted but the valve is larger and more expensive so this is only used where free flow is required, for example in pipelines which require pigging. 

Some ball valves also be reduce port design. In Reduced port (more commonly known as reduced bore) ball valves, flow through the valve is one pipe size smaller than the valve's pipe size resulting in flow area being smaller than pipe. As the flow discharge remains constant and is equal to area of flow (A) times velocity (V), A_1V_1=A_2V_2 the velocity increases with reduced area of flow.

Ball valve should not be confused with a "ball-check valve", a type of check valve that uses a solid ball to prevent undesired backflow. There are five general body styles of ball valves: single body, three-piece body, split body, top entry, and welded. The difference is based on how the pieces of the valve—especially the casing that contains the ball itself—are manufactured and assembled. The valve operation is the same in each case. In addition, there are different styles related to the bore of the ball mechanism itself.