When it comes to waste removal, dealing with drainage smells and pressure changes within the pipes the waste travels through is normally dealt with using a soil and vent pipe, however this isn’t always possible. Screw on Fixing: With the screw-type fixing, the coupling supplied with the AAV will have a thread within it and on the base of the AAV itself will be a thread. Simply fit the coupling to the top of the vertical pipe and then screw the valve down into the coupling until it is tight With all the pipework in place and the valve securely fitted, allow enough curing time for the solvent adhesive and then give the valve a test to make sure all is working ok and the issue that caused you to install the valve in the first place has now been resolved. Installing 110mm Air Admittance Valves

As good and useful as air admittance valves can be they can also cause some problems, especially when they become old and worn. In pretty much all cases it’s best to use solvent weld fittings as once they are fitted and the adhesive has dried they are pretty much guaranteed not to leak.This equalization of pressure prevents the foul air in the pipework from escaping as any and all water seals e.g. U and P-traps remain intact. With the case of smaller valves, as mentioned, they only need to feature where localised siphoning issues occur. How do Air Admittance Valves Work? Air Admittance Valves, sometimes called Durgo Valves, are one-way air valves that can be installed instead of Soil Vent Pipes, or sometimes in addition to them, to help keep the pressure in soil and waste systems balanced. How does an Air Admittance Valve work? Color Variants: For aesthetic or coding purposes, these valves come in different colours to match or identify different plumbing systems.

Install air admittance valves at least 200mm above the highest waste water entry point on a 110mm waste pipe When a soil vent system is not included or can’t be for whatever valid reason, an air admittance valve is then used in its place. Note: One final point to establish is that a 110mm air admittance valve will only need to be installed if the soil pipe itself isn’t vented e.g. can’t run up and out of the roof or external wall as it normally would do.

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In most cases installing one in a standard home should be fine, the Building Regulations mainly cover extreme situations such as high-rise buildings, where there may be many waste pipes and different levels that require a fine balance to be maintained.

As we have looked at above, there are 2 different types of air admittance valve. In the majority of cases the one that you’ll be fitting will be the smaller version to take care of localised pressure issues. Polypipe Soil & Vent: Anti-syphon unit (automatic air admittance valve) for Ø32mm (1 1/4'') waste pipe allows air to enter branch discharge pipes, protecting water seals in traps from effects of negative pressure and preventing self-siphonage.This 32mm air admittance valve is manufactured from modified uPVC, and comes in white. It has been designed to work with solvent weld jointing, which ensures the joint is secure, durable and leak-free. Not only that, but our soil and waste systems connect to the mains sewer (unless you have an off-mains system), which means that gases produced by everyone else's waste in your street can float up through your pipes. While they do not generally pose a significant health risk in low concentrations, exposure to certain chemicals that can be present (such as hydrogen sulfide) can irritate your eyes, give you a sore throat or cough, and cause shortness of breath. However, prolonged exposure to, or higher concentrations of, these chemicals and gases can be a much more severe health risk. Hydrogen sulfide and methane build-up can even be an explosion risk since both are highly flammable. POLYPIPE Soil & Vent Fitting - Anti-Syphon Unit (Automatic Air Admittance Valve) for Ø32mm (1 1/4'') Solvent Weld Waste Pipe; White. If the section of vertical pipe is fairly long, you will have to add at least 1 pipe clip to secure the pipe firmly to the wall.