Traditional processing methods casting ball valve ball valve is used to rotate the valve flow or occlusion. Valve switch light, small size, can be made into a great caliber, simple structure, easy maintenance, and spherical sealing surface often in the closed state, can not easily be eroded media, has been widely used in various industries. Ball and plug valves belong to the same type of valve, ball valve closure member only is a sphere, the sphere rotating around the center line valve to achieve open, and close a valve. Its sphere formation there are three main methods: casting, forging and spinning method. Casting law is one of the traditional processing methods, it requires a complete melting, casting and other equipment, but also requires a larger plant and more workers, investment, process more complex production process, and pollution of the environment, every worker skill level processes directly affect the quality of the product, the ball valve capillary leak still can not completely solve the problem, but the rough allowance big waste, often found in the process of casting defects due to scrap it, to make increased product cost, quality can not be guaranteed. Fortunately, the ball valve where the valve sealing surface material widely used plastic, sealing, and has also been widely used in the vacuum system; easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation of 90 °, to facilitate remote control. Easy maintenance, simple ball valve, seals are generally activities, the removal replacement is more convenient; in the fully open or fully closed, the sealing surface and the dielectric isolation ball and seat, through the media, does not cause the valve sealing surface erosion. Wide range of applications, from small diameter to a few millimeters to a few meters from high vacuum to high pressure can be applied. When the ball is rotated 90 degrees, in the import and export of office should be fully rendered sphere, thus cutting off the flow.