Backflow preventer (also known as anti-pollution isolation valve) is a new type of water control valve developed by our company to prevent pressure backflow and siphonic backflow. It is mainly used in pipeline systems where the medium is water or physical and chemical properties similar to water and backflow pollution is strictly prohibited.

It consists of two check valves and a drain valve installed in the middle. It is divided into integral and separate forms according to its structure. The backflow preventer provided by our company is integral for the pipe size below dn50 (inclusive) and separate for the pipe size above dn50. Both are similar in function.

Main Overall Dimensions Unit：mm