Main Components Material
| No. | Name | Material |
| 1 | Valve Body | Ductile Iron 450-10 |
| 2 | Valve Clack | Ductile Iron450-10+EPDM |
| 3 | Float ball | Stainless steel 304 |
| 4 | Ring | NBR |
| 5 | Sealing ring | EPDM |
| 6 | bolt and nut | 304 |
| 7 | valve cover | Ductile Iron 450-10 |
| 8 | Valve plate | 2Cr13 |
| 9 | Disc nut | QA19-4 |
| 10 | Bleed screw | 304 |
| 11 | Upper Cap | Ductile Iron450-10 |
| 12 | bonnet | Ductile Iron450-10 |
| 13 | dust cover | Q235 |
Detailed Size of Main Parts
| PN16 | ||||||
| Nominal Diameter | Size(mm) | |||||
| DN | D | D1 | D2 | b | n-d | f |
| 50 | 165 | 125 | 99 | 20 | 4-19 | 3 |
| 65 | 185 | 145 | 118 | 20 | 4-19 | 3 |
| 80 | 200 | 160 | 132 | 22 | 8-19 | 3 |
| 100 | 220 | 180 | 156 | 24 | 8-19 | 3 |
| 150 | 285 | 240 | 211 | 26 | 8-23 | 3 |
| 200 | 340 | 295 | 266 | 30 | 12-23 | 3 |
Product Features Advantages
High - efficiency air exhaust and intake：The unique double - orifice structure significantly enhances the air circulation efficiency. During the water - filling stage of the pipeline, the two openings work in tandem, expelling the large amount of air originally accumulated in the pipeline at a much faster speed than single - orifice valves. This prevents the formation of air locks caused by trapped air and ensures the smooth flow of water. When the pipeline is draining, the two orifices can simultaneously and rapidly intake air to quickly balance the pressure inside and outside the pipeline, greatly reducing the drainage time and significantly improving the overall operating efficiency of the pipeline system.
Prevention of air locks and water hammers：The timely and efficient air exhaust and intake functions fundamentally eliminate the possibility of air locks. Meanwhile, in the face of pressure fluctuations caused by changes in the water flow velocity within the pipeline, the Double Orifice Air Vent Valve can respond promptly. By precisely controlling the amount of air intake and exhaust, it effectively buffers the peak pressure, greatly reducing the impact force of water hammers and comprehensively protecting the pipeline and its ancillary equipment, thus extending their service life.
Simple and compact structure：This valve discards complex designs, and its overall structure is simple and clear. The double - orifice layout upgrades its functions without adding too many components, resulting in a small size and minimal space occupation. Whether in a narrow existing pipeline well or a newly - built pipeline project with a compact space plan, it can be easily installed and flexibly adapted to various installation environments.
High reliability：The valve is extremely strict in material selection. High - wear - resistant materials are used to manufacture key components, which can withstand the long - term and high - speed scouring and wear of the fluid in the pipeline. At the same time, the good corrosion resistance of the materials makes it resistant to various corrosive media. Whether it is used to transport ordinary clean water or industrial water with a certain degree of corrosiveness, it can operate stably under corresponding working conditions and always maintain good performance.
Low maintenance cost：The simple structure means fewer fault points. Only routine inspections are required in daily use, without complicated maintenance procedures. Even if problems occur occasionally, due to the small number of components and easy disassembly, maintenance work can be completed quickly, greatly reducing the manpower and material resources required for maintenance and effectively lowering the long - term operating cost of the pipeline system.
