backflow preventer
technical parameter
product model: hs41x (a)
nominal diameter: dn50~dn600
nominal pressure: pn10/16
operating temperature: 0°c~85°c
applicable medium: water
manufacturing standard: gb/t25178
body material: cast iron, ductile iron, cast steel, stainless steel
product description
the backflow preventer is a safety device composed of a drainer between two check valves, which is used to prevent backflow pollution of drinking water pipes. ensure the hygiene and safety of drinking water.
product features
1. the double check valve is designed as a whole, with small structure size, light weight and convenient installation and maintenance.
2. the valve body adopts the streamline type, the resistance loss is small, and the energy is saved.
3. the combination of double check valve and safety drain valve can completely prevent backflow pollution under any working conditions.
4. all moving parts are made of stainless and wear-resistant materials with long service life.
material of main parts
| no | part name | material |
| 1 | body | cast iron, ductile iron, cast steel, stainless steel |
| 2 | cap | cast iron, ductile iron, cast steel, stainless steel |
| 3 | disc | ductile iron |
| 4 | spring | stainless steel, chrome vanadium steel |
| 5 | anti-fouling valve | brass |
main external connection dimensions
dn | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 |
l | 458 | 482 | 551 | 653 | 735 | 793 | 1008 | 1186 | 1340 | 1505 | 1670 | 1886 | 1986 | 2318 |
h | 210 | 235 | 264 | 308 | 356 | 400 | 503 | 595 | 705 | 705 | 905 | 910 | 921 | 1210 |