Backflow preventer (also called antifouling block valve) is a new type of water control valve developed by our company to eliminate pressure backflow and siphon backflow, which is mainly applicable to pipeline systems where the medium is water or the physical and chemical properties are similar to water and backflow pollution is strictly prohibited.

It is composed of a two-stage check valve and a drain in the middle. According to the structure, it can be divided into two types: integral type and split type. The backflow preventer provided by our company is integral type if the caliber is less than DN50 (inclusive), and split type if the caliber is more than DN50. They are similar in function.