Df41x backflow preventer

Df41x backflow preventer is a safety device used to prevent backflow pollution in drinking water pipes. It is composed of a drain between two-stage check valves. The upper chamber of the diaphragm is connected with the inlet end of the first stage check valve. This valve is a new type of safety valve to prevent the pollution of drinking water backflow, so as to ensure the safety and hygiene of drinking water.