1. Body is adopted for seamless steel pipe to press the molding.2. The overall structure of the body can reduce the external leakage by the full weld manufacturing process; the weight of the valve is greatly reduced and installed much more conveniently.3.To adopt the spring washer and carbon fiber seal ring, they can support hundred of thousands of times reciprocating motion. Thus there is no leakage; they ensure the service life of the valve.4. the valve seal ring can be used continuously without failure in the -40℃－200℃ situation.5.There are many connecting methods, such as butt end, flange end and socket weld etc; there are many open mode, such as handle, gear operation and electric etc.6. Long stem buried welding ball valve can be deep-seated under ground; meanwhile don’t set up underground valve control room. Operator can just use the handle or gear operation on the ground. It is very convenient. 7.Welded ball valve is widely used in urban central heating, natural gas transmission and regulator station and other areas. they are the top selection in construction project.