Backflow Preventers

HS41X backflow preventer is a type of non-return valve installed in various pipeline systems to strictly prevent medium backflow and protect the subsequent medium or equipment from pollution. It consists of two series check valves and a filter part, with tight sealing to ensure no medium backflow, safe and reliable, and long service life.

HS41X-A backflow preventer with filter consists of two separated check valves and a hydraulically actuated drain valve. A filter screen is installed inside the first check valve. Due to the local head loss of the check valve, the pressure in the intermediate chamber is always lower than that at the inlet. This pressure difference keeps the drain valve closed during normal water supply. In case of abnormal pressure (i.e., when the outlet pressure exceeds that of the intermediate chamber), even if

Ultra-low water loss and remarkable energy saving: At an economic flow rate (2 m/s), the head loss is less than 4 mH O.Air 2 gap isolation and automatic drainage: When the main valve is closed, the drainer automatically opens to drain the intermediate chamber, achieving air gap or zero-pressure isolation between the upstream and downstream of the main valve, ensuring safe and reliable isolation performance. Material-saving and flexible installation: Compact in size and light in weight, with a st