Backflow preventer is a device composed of backflow components that can prevent the backflow of water supply pipes. 

   [Features] 

 Using the principle of decompression to achieve low resistance, when working normally at economic flow rate, the actual water loss is only 1.8-2.5 meters. 

 The structure is compact and the size is shorter. The two-stage independent check valve has a small flow resistance and fast opening and closing, which can effectively prevent the damage caused by the sudden increase in back pressure to valves and pipes, and has a silent function. 

 The drainage pressure of the drain valve is adjustable, which is less disturbed by pipeline fluctuations, and it is safe and reliable to open and close. 

 The design of double membrane can prevent backflow pollution caused by membrane damage. 

 The structure of the air partition with dual intake and exhaust channels so that the air intake and drainage in the partition cavity do not affect each other, and there will be no problems of drainage and poor drainage, which can completely limit the possibility of pressure water backflow or siphon backflow. 

 The built-in safety control pipeline system avoids the danger of the exposed bypass pipe being easily stolen and damaged, and can prevent it from being used for destructive activities such as poisoning, so as to ensure safe use and beautiful appearance. 

 It can be tested and repaired online.

Each process, each facility, and each environmental constraint has its own special requirements. Therefore, Dongyan offers a comprehensive range of products covering different performance levels, pressures, different functions and different materials.