dc type low resistance backflow preventer
technical parameter
product model: lhs743x-10/16q
nominal diameter: dn50-dn400
nominal pressure: 1.0-1.6mpa
dynamic head loss: ≤0.03 mpa
partition form: air partition or zero pressure partition
body material: ductile iron
internal material: 304 stainless steel
applicable temperature: ≤65℃
product features
1. ultra-low water loss and significant energy saving: at an economical flow rate (flow rate of 2 m/s), the head loss is less than 4mh2o.
2. air isolation and automatic drainage: when the main valve is closed, the drainer is automatically opened, and the pressure in the middle cavity is zero. air isolation or zero-pressure isolation is realized between the upstream and downstream of the main valve, and the isolation performance is safe and reliable.
3. save land and materials, flexible installation: small shape, light weight, the structural length is only 30% of the 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 |