Due to the computer aided design (CAD) and computer aided manufacturing (CAM) and flexible manufacturing systems (FMS) in the valve industry application, make the ball valve design and manufacturing to a whole new level. Not only the valve design comprehensively and reduce the computational method of professional and technical personnel of heavy conventional design work, make repetitive technical personnel more effort to improve, improve product performance and new product development, shorten the new product research and development cycle, improve labor productivity, and lifting lever type metal sealing ball valves developed process, because of CAD/CAM application, appeared by computer aided design, computer aided by CNC processing manufacturing stem spiral flat, metal sealing ball valves in open-close process without any scratch and wear, so that the sealing ball valves and service life greatly. Valves in the fully open, small flow resistance, almost equal to zero, such as track ball valve is widely applied in oil and gas pipelines, for easy cleaning line. Due to the ball in the sphere of sex, wipe with most ball valve can be used with suspended solids medium, on the basis of the sealing material also can be used in powder and granular medium.
