The ball valve is normally used as positive shut off valves. The positive shut off is attained because of the soft seats. Special design is also available with ball having shaped port for regulation. Metal seated ball valves are also available for high temperature service.
They are also considered as quarter turn valves as the closing action is achieved by rotating the lever by 90Deg.They are one of the most widely used valves in process industries because of their versatility, support pressures up to 1000 bar and temperatures up to 482°F (250°C). Sizes typically range from 1/2 to 30 inches. They are easy to repair and operate.
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