SS 316 float, float guides and guide ring, A4 bolts, 300µm coating

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Air relief valve for drinking water (not wastewater) and neutral liquids max. 70° C

AVK series 851 double orifice, triple action air valves are designed to allow air to rapidly either escape or enter the pipe system when filling or draining, as well as for automatic discharge of accumulated air during normal working conditions. The unique ‘Aerokinetic’ design allows air to rush out of the system at great speed without forcing the float upwards and closing it prematurely. This makes sure that the valve closes only after all air has left the system and water has entered the chamber.
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 851/45-001
Connection: Flanged
Material: Ductile iron
DN: DN50 - DN200
PN: PN 16


  • A clever float design prevents air rushing out of the system from prematurely closing the valve
  • Large air flow capacity
  • All iron parts with contact to the water are coated with drinking water approved, fusion bonded epoxy
  • The resilient seals are made of drinking water approved EPDM
  • All other internal parts are highly corrosion resistant AISI 316 stainless steel
  • No moving parts are touching the internal coating
  • The complete product is approved for drinking water



Reference nos. and dimensions:

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AVK ref. no. D
Flange DN
DN mm
851-050-45-122000 50 DN 50 PN10/16 277 165 82 220 16
851-080-45-122000 80 DN 80 PN10/16 277 165 82 220 17
851-100-45-122000 100 DN 100 PN10/16 283 205 102 248 23
851-150-45-122000 150 DN 150 PN10/16 345 255 127 286 36
851-200-45-122000 150 DN 200 PN16 345 255 127 286 40
3D drawings
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1. Body Ductile iron GJS-500-7
2. Orifice float, small Stainless steel 1.4401 (316)
3. Screw Stainless steel A4
4. Sealing face EPDM rubber
5. Split pin Stainless steel A4
6. Orifice bracket Polyamide
7. O-ring EPDM rubber
8. Gasket EPDM rubber
9. Bonnet Ductile iron GJS-500-7
10. Orifice cover Polyamide
11. Plug Plastic
12. Cowl Ductile iron GJS-500-7
13. Washer Stainless steel A4
14. Bonnet Ductile iron GJS-500-7
15. Bolt Stainless steel A4
16. Seat ring Stainless steel 1.4401 (316)
17. Guide ring Stainless steel 1.4401 (316)
18. Seal ring EPDM rubber
19. Float guide bottom Stainless steel 1.4401 (316)
20. Orifice float, large Stainless steel 1.4401 (316)
21. Float guide top Stainless steel 1.4401 (316)
22. Bolt Stainless steel A4
23. Washer Stainless steel A4
24. Nut Stainless steel A4
25. Bolt Stainless steel A4
26. Nut Stainless steel A4


  • Hydraulic test according to EN 1074-1 / EN 12266
  • WRAS approved to max. 50°C


  • EN 1074-4
  • Flange drilling to EN1092, PN10/16
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