Low and high pressure air relief valve (double effect): the device evacuates great air amounts during the filling of the main, allows the inlet of great air amounts (in order to avoid a vacuum effect) during the emptying of the main and evacuates small air amounts that are accumulated in the high points of the main during normal working conditions
| Description | PFA(bar) | Flange drilled(mm) | Flange(mm) | D(mm) | A(mm) | B(mm) | H(mm) | Mass(kg) |
|---|---|---|---|---|---|---|---|---|
| 4000 D | 16 | 40. 50. 60 et 65 | PN10-16 | 185 | 150 | 198 | 275 | 15 |
| 4000 D | 25 | 50 | 10-16-25 | 185 | 150 | 198 | 275 | 15 |
| 4000 D | 25 | 60 et 65 | PN25 | 185 | 150 | 198 | 275 | 15 |
| 6000 D | 16 | 80 | 10-16-25 | 200 | 220 | 222 | 370 | 25 |
| 6000 D | 25 | 80 | 10-16-25 | 200 | 220 | 222 | 370 | 25 |
| 9000 D | 16 | 100 | PN10-16 | 235 | 270 | 250 | 460 | 38 |
| 9000 D | 25 | 100 | PN25 | 235 | 270 | 250 | 460 | 38 |
| 9000 D | 16 | 150 | PN10-16 | 300 | 270 | 250 | 460 | 42 |
| 9000 D | 25 | 150 | PN25 | 300 | 270 | 250 | 460 | 42 |