Screened Spill Over Weirs
Why do you need Screened Spill Over Weirs? Many water authorities are demanding water storage tanks that are connected to the mains supply to have fitted a backflow prevention system to protected the mains from contamination, this can be achieved with an Airgap.
An AB Airgap give the Highest Category of Backflow protection to the mains (Category 5)
The AB Airgap is achieved by fitting Screened Spill over Weirs between the Inlet and overflow heights.
These Weirs comprise of a screen made with 316 stainless steel mesh and sized to be able to cope with the inlet flow on the tank so as to comply with water regulations and compliant to BS EN 13077:2008.
Cowled Weirs are suitable for indoor and outdoor as they also prevent ingress of light into the tank
Framed Weirs are suitable for indoor use only. Cowls for these are available on request to allow for outdoor use.
These Weirs are suitable to create a Cat 5 Backflow Prevention ( Type AB Airgap ), by fitting the weirs into the walls of the tank or fitting a raised ball valve Housing with the weirs in the wall of the Housing onto the lid of the tank.
Type AB Air Gap Screened Spill Over Weirs
1 No. 400*95mm Cowled Weir suitable for inlets up to 1″
2 No. 400*95mm Cowled Weirs suitable for inlets up to 1 1/4″
2 No. 400*160mm Cowled Weirs Suitable for inlets up to 2″
2 No. 400*200mm Framed Weirs Suitable for inlets up to 2 1/2″
2 No. 400*230mm Framed Weirs Suitable for inlets up to 3″
Special sized Weirs can be made for larger inlets, please contact our offices for prices and sizes.