AFS

Air Release Valve


AFS’ Air Release Valve offers a tri-functional air valve that not only breaks vacuum, but also reduces surge on pipeline filling and releases air under operating conditions. AFS’ vacuum break valves should be located on the apex of a pipeline to allow air to enter if the pipe ruptures or a scour valve is opened.

Product features

Specifications
Size range:25mm – 200mm.
Valve type:Air release
Barrel:304 stainless steel
Flanges:Mild steel, FBE coated or threaded (BSP)
Temperature range:80°C
Pressure rating:Up to 580 psi (40 bar)
Body material:Stainless steel (304 or 316)
Floats:Guided HDPE
Screen and cover plate:304 stainless steel
Flanged body:ANSI B16.5, DIN, Screwed, SABS & BS optional
Seals and O rings:EPDM

Features
  • Triple function.
  • Light weight.
  • Non slam.
  • Cost effective.
  • No sticking.
  • Small orifice to bleed air.
  • Controlled velocity.
  • Anti shock function.
  • No blocking or leakage.
  • No sticking of the floats.
  • EPDM ‘O’ Ring for positive seal.
  • The solid float will not deform under pressure.
  • The cylindrical design also increases the effectiveness of the valve’s operation during vacuum conditions.

PLACEMENT


The graphic shows most of the common places where AV (air release valves) are fitted. High points are a natural start, also where the pipeline crosses obstacles like rivers and roads. Check for syphon application above the hydraulic grade line. To control pump start and pump trip, AV should be placed before and after the check valve.

Applications

The valve is suited for deep well pumping, waterlines, sewage, pump suction and pump discharge.

Dimensions and Weights

Dimensions and weights are for guidance only – detailed dimension drawings are available on request.
All dimensions are in millimetres, unless otherwise stated.

Valve
Size
HeightDiameterBleed Nozzle
OD
Anti Shock
OD
Weight
25325951.13.35
503351151.56.58
803301201.810.516
1003301651.813.520
15044028532060
20052030032790
PartsDescription
1Body304 Stainless Steel
2Cover Plate304 Stainless Steel
3Screen304 Stainless Steel
4Barrel304 Stainless Steel
5FloatsHDPE
6Bottom FlangeFBE Coated Mild Steel
7Seals & O-RingEPDM
8Tie Rods304 Stainless Steel