DOUBLE ORIFICE CLUSTER ARRANGEMENT AIR VALVE WITH VNR VALVE, PN16
ABS float, guide and seat, A4 bolts, 300µm coating, DN150-250
Contact
AVK International A/S
Bizonvej 1, Skovby, 8464 Galten, Denmark
Double orifice cluster arrangement 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 851/20-007 | |
|---|---|
| Connection: | Flanged |
| Material: | Ductile Iron |
| DN: | DN150 - DN250 |
| PN: | PN16 |
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
- Fusion bonded epoxy, 300µm coating in compliance with DIN 3476 part 1 and EN 14901, GSK approved
-
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:
| AVK ref. no. | DN mm |
Flange drilling |
A mm |
B mm |
C mm |
D1 mm |
H3 mm |
Theoretical weight/kg |
|---|---|---|---|---|---|---|---|---|
| 851-150-20-122010 | 150 | PN16 | 592 | 510 | - | 100 | 715 | 169 |
| 851-200-20-122010 | 200 | PN16 | 921 | 867 | 734 | 100 | 715 | 259 |
| 851-250-20-122010 | 250 | PN16 | 921 | 867 | 867 | 100 | 715 | 340 |
Components
| 1. | Body | Ductile iron GJS-500-7 (GGG-50) |
| 2. | Float guide bottom | ABS |
| 3. | Float guide top | ABS |
| 4. | Plug | Stainless steel 316 |
| 5. | Large orifice float | ABS |
| 6. | Guide ring | ABS |
| 7. | Seal ring | EPDM rubber |
| 8. | Seat ring | ABS |
| 9. | Body | Ductile iron GJS-500-7 (GGG-50) |
| 10. | Gasket | EPDM rubber |
| 11. | Disc | Polyamide |
| 12. | Pin | Stainless steel A4 |
| 13. | Cover | Ductile iron GJS-500-7 (GGG-50) |
| 14. | Gasket | EPDM rubber |
| 15. | Regulating plug | Polyamide |
| 16. | Orifice cover | Polyamide |
| 17. | Orifice bracket | Polyamide |
| 18. | Gasket | EPDM rubber |
| 19. | Grooved pin | Stainless steel A4 |
| 20. | Small orifice float | ABS |
| 21. | Side chamber | Ductile iron GJS-500-7 (GGG-50) |
| 22. | O-ring | EPDM rubber |
| 23. | Bolt | Stainless steel A4 |
| 24. | Nut | Stainless steel, A4 acid resistance, w. delta seal |
| 25. | Washer | Stainless steel A4 |
| 26. | Gasket | EPDM rubber |
| 27. | Body | Ductile iron GJS-500-7 (GGG-50) |
Test/Approvals
- Hydraulic test according to EN 1074-1 / EN 12266
- Approved according to WRAS Certificate 1501702
Standards
- Designed according to EN 1074 - 4
- Standard flange drilling to EN1092-2 (ISO 7005-2), PN16
