This valve is a series of new connection valves designed and manufactured by introducing similar advanced products from the United States and Germany. It has the advantages of fast, simple, safe, reliable installation, not limited by the installation site, convenient for maintenance of pipelines and valves, vibration isolation and sound insulation, and can overcome errors caused by different axes of pipeline connections within a certain angle range, and solve the problems caused by temperature differences. Thermal expansion and contraction, etc. It is widely used in water supply, fire protection, air conditioning, gas, petroleum, chemical, water treatment, municipal, shipbuilding and other pipeline projects for conveying fluid pipelines as a control fluid.