Low resistance backflow preventer
Nominal diameter: DN50-DN400
Nominal pressure: 1.0-1.6MPa
Dynamic head loss: ≤ 0.03 MPa
Partition form: air partition or zero voltage partition
Valve body material: ductile iron
Internal material: 304 stainless steel
Applicable temperature: ≤ 65 ℃
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1. Ultra low water loss and significant energy saving: At an economic
flow rate (flow rate of 2 meters/second), the head loss is less than
4mH2O.
2. Air isolation and automatic drainage: When the main valve
is closed, the drainage device automatically opens and the pressure in
the middle chamber is zero. Air isolation or zero pressure isolation is
achieved between the upstream and downstream of the main valve, ensuring
safe and reliable isolation performance.
3. Land and material
saving, flexible installation: small in size, light in weight, with a
structural length only 30% of that of existing similar products; It can
be installed horizontally or vertically.
Main external connection dimensions
| DN | 50 | 65 | 80 | 100 | 150 | 200 | 250 | 300 |
| L1 | 190 | 210 | 225 | 250 | 340 | 400 | 460 | 540 |
| H1 | 132 | 142 | 150 | 160 | 192 | 220 | 252 | 280 |
| H2 | 160 | 166 | 176 | 195 | 235 | 266 | 305 | 350 |
| B1 | 83 | 93 | 100 | 110 | 143 | 170 | 203 | 230 |
| B2 | 133 | 143 | 170 | 180 | 213 | 240 | 273 | 400 |
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shghfmc@163.com 
93862333