AVK DOUBLE ORIFICE AIR VALVE WITH VNR VALVE, PN16
Double orifice air valve with VNR valve for drinking water (not wastewater) and neutral liquids max. 70° C
AVK series 851 double orifice air relief valves allows air to enter the pipeline freely on separation, but controls the expulsion as the column rejoins. This creates an air buffer that effectively reduces the impact velocity and the surge potential of the system. The second orifice automatically discharges accumulated air during normal working conditions.
All iron components are protected with fusion bonded epoxy coating in a GSK-approved process to ensure high durability. All other components are made of either WRAS approved polymer material or stainless steel to reduce corrosion risk even further. All seals are made of WRAS approved EPDM rubber featuring an excellent compression set and ability to regain its original shape.
| Variant 851/20-004 | |
|---|---|
| Connection: | Flanged |
| Material: | Ductile iron |
| DN: | DN50 - DN150 |
| PN: | PN 16 |
Features
- A clever float design prevents air rushing out of the system from prematurely closing the valve
- Large air flow capacity
- Vented non return (VNR) valve, allows free inflow and restricted outflow
-
Ductile iron parts coated with GSK approved fusion bonded epoxy
-
Internal components are EPDM or ABS, WRAS approved
- No moving parts are touching the internal coating
- The complete product is approved for drinking water
Downloads
Reference nos. and dimensions:
| Reference no. | DN mm |
Flange drilling |
A mm |
D mm |
D1 mm |
H3 mm |
W1 mm |
W6 mm |
Theoretical weight/kg |
|---|---|---|---|---|---|---|---|---|---|
| 851-050-20-122001 | 50 | PN16 | 138 | 165 | 50 | 326 | 69 | 210 | 24 |
| 851-080-20-122001 | 80 | PN16 | 190 | 200 | 80 | 375 | 95 | 237 | 37 |
| 851-100-20-122001 | 100 | PN16 | 242 | 220 | 100 | 473 | 121 | 255 | 64 |
| 851-150-20-122001 | 150 | PN16 | 242 | 285 | 150 | 473 | 121 | 255 | 66 |
Components
| 1. | Body | Ductile iron GJS-500-7 (GGG-50) |
| 2. | Float guide bottom | ABS plastic |
| 3. | Float guide top | ABS plastic |
| 4. | Plug | Stainless steel AISI 316 |
| 5. | Float, large orifice | ABS plastic |
| 6. | Guide ring | ABS plastic |
| 7. | Seal ring | EPDM rubber |
| 8. | Seat ring | ABS plastic |
| 9. | O-ring | EPDM rubber |
| 10. | Body | Ductile iron GJS-500-7 (GGG-50) |
| 11. | Gasket | EPDM rubber |
| 12. | Disc | Polyamide |
| 13. | Pin | Stainless steel A4 |
| 14. | Cover | Ductile iron GJS-500-7 (GGG-50) |
| 15. | Gasket | EPDM rubber |
| 16. | Regulating plug | Polyamide |
| 17. | Orifice cover | Polyamide |
| 18. | Orifice bracket | Polyamide |
| 19. | Gasket | EPDM rubber |
| 20. | Grooved pin | Stainless steel A4 |
| 21. | Float, small orifice | ABS plastic |
| 22. | Side chamber | Ductile iron GJS-500-7 (GGG-50) |
| 23. | O-ring | EPDM rubber |
| 24. | Washer | Stainless steel A4 |
| 25. | Bolt | Stainless steel A4 |
| 26. | Bolt | Stainless steel A4 |
| 27. | Washer | Stainless steel A4 |
| 28. | Nut | Stainless steel A4, Delta Seal |
Test/Approvals
- Hydraulic test according to EN 1074-1 / EN 12266
- Approved according to WRAS certificate 241102017, max. 50°C
Standards
- EN 1074-4
- Flange drilling to EN1092, PN16
