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AVK DOUBLE ORIFICE CLUSTER ARRANGEMENT AIR VALVE WITH VNR VALVE, PN16

ABS float, guide and seat, A4 bolts, 300µm coating

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: 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

Reference nos. and dimensions:

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Reference 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
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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. 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. Float, small orifice ABS plastic
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, 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 241102017, max. 50°C

Standards

  • EN 1074-4
  • Flange drilling to EN1092, PN16
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