The ball valve is a flow control device, using the disk or ball through the center hole spherical. When the flow direction of the hole on both sides of the valve is open. When the ball is opened, industrial valves the hole closed and traffic to reduce the proportion of the size of the hole. When engineers are designing the process of use of the ball valve, certain design requirements are necessary to match the flow conditions the valve.

Design requirements of the ball
The spherical ball can be metal, plastic or ceramic. The metal ball must be polished, high gloss, to allow the open and closed position with a smooth transition between the seats. Edge of the ball must have the curvature of the blend, in order to prevent valve seat wear and leakage. In order to maintain the equilibrium between the flow path and the pressure of the body cavity, the hole should be cut dry socket. Ball construction materials must be compatible chemistry and fluid flow, in order to avoid corrosion.

Body and sealed
The body must insist on compliance with ASME B16.34 cast traceability. The construction material must be compatible with chemical and fluid flow, and can be metal, plastic or ceramic, depending on the application. Physical seal or seat the ball from around the process of transferring fluid seals. gate valves If it is not the correct body sealing materials, corrosion and valve leakage may occur. Seals can be made ​​of high polymer or rubber (synthetic rubber - molded polymer).

Stop and deal with
The valve stem connection handle the ball, must be properly co-ordination to ensure a proper seal. Dry specifications may include a variety of styles and materials, according to the process conditions. Under normal circumstances, the ball and stem are using the same material construction. The stem packing provides a seal between the stem and the body. The valve handle is not wet (contact part of the process fluid) materials of the same material. The handle can be equipped with a safety trigger to prevent unintended movement of the ball. Larger valves can be specified, ball valves including the automatic drive or gear operator, to assist in opening and closing valves.