FloPlast AV32 32mm Air Admittance Valve-Compression, White

Product Information

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.

The final task is to now fit the AAV in its location on top of the T-piece, but before this can be done you will need to cut and fit a vertical section of pipe that will sit the valve above the highest point that waste water can enter the waste pipe. 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. One final point to mention is that there are 2 different types of air admittance valve; the large 110mm valve for use with soil pipework and a smaller 32mm or 40mm version for use on sink, bath, basin etc. smaller bore waste pipes. When they aren’t, to fix any issues that arise, a handy product called an Air Admittance Valve is used, find out all about them and how they are used below. What is the Purpose of an Air Admittance Valve? 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.The most commonly sold AAV is the rubber push fit ones that we sell here at EasyMerchant. They’re easy to install, a matter of just pushing them into the pipe, and they’ll create a watertight and airtight fitting. Some will prefer the solvent weld air admittance valves though, as once cemented these will create a permanent connection. Are there any issues to consider when using an air admittance valve? Next, use a tape measure to measure up 200mm and then mark the wall and then measure from the base of the collar of the T-piece up to the top mark and this is how long your vertical pipe needs to be. You can, but it’ll need to be the right one. Most air admittance valves are designed only for use inside, so if you’re planning on doing this you will need to buy one that is suitable for external use. The only real reason for doing this would be if there was nowhere suitable to vent the pipe in the usual way, such as as mentioned previously, too close to a window, or not able to get above roof level. As I said before an open vent must be installed more than 3 meters away from a window and this is not always possible. In this scenario you could use an AAV that is rated for external use, as these can be placed close to the window as they will not allow escape of foul smelling gasses. Once tested and all well, apply a good coating of solvent weld adhesive to the inside of each collar at each end of the T-piece and then a coating around the cut end of each pipe for about 20mm and then push it on to one end of the pipes and wiggle the other end in, pushing both sections right up to the base of each collar. See the solvent weld project mentioned above for any additional help.

A modern alternative to solving the pressure problem in soil and waste systems is through the use of Air Admittance Valves. If you are fitting into existing pipework, you will need to install a "T-piece" or equal-T as it’s known. The T-piece will allow the existing drainage to still work plus provide a spur for the section of vertical pipe the valve can be fitted onto.First, mark the exact point on the pipe that you want the T-piece adaptor to go and then use a tape measure to measure the body section between the 2 collars. This is how much of the pipe you will need to cut away. 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. Adjust the spare top inlet using a spirit level so that it is pointing directly upwards so when the vertical pipe is fitted it is upright and square. 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. In almost all instances they are installed internally. Only those made especially for use outside can be used externally as they need to be weather and frost proof to prevent them freezing up and stopping working, in which case the above issues can occur.

Durgo Valves are used in various scenarios where conventional venting is not possible or practical. They are typically employed in internal plumbing systems where connection to an external vent is difficult, such as in high-rise buildings, basement bathrooms, or in renovations where access is limited. Types of Durgo ValvesAs you can see, the advantages of using them are many but, as with all things, there are also some disadvantages. This can be in the actual room or in the case of a loft conversion, this may also be in the eaves behind the room and appliance. A popular choice is under the sink with the valve extended up behind it so it’s well above the plug hole. Colour Coding: Choose a colour that either matches your plumbing fixtures or follows the colour coding of your plumbing system. The air admittance valve (AAV), or Durgo valve as it’s also known helps to regulate the air pressure inside waste pipework and soil pipes, stop any smelly gas from escaping and also ensure solid waste is allowed to drain away to the main drain correctly.

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. Otherwise it may be that the AAV has been installed in an incorrect location, such as below the point of another water entry to the system. For example, the durgo valve has been installed below a toilet on the floor above this will result in valve not being able to draw the air in as it is supposed to and causing negative pressure within the system. Air admittance valve under sink? Pipe Size Compatibility: Ensure the valve is compatible with the size of your waste pipe. Universal valves are versatile, while specific size valves provide a tailored fit. In the majority of cases and in most homes in the UK, the balance of pressure within a waste pipe system is maintained through a soil vent system. This is just a vertical extension of the soil pipe system that stops beyond the highest drainage point in the property.Airflow Requirements: Different valves allow for varying amounts of airflow. It’s essential to choose one that can handle the airflow requirements of your plumbing system to maintain efficiency. The air admittance valve is a one way ventilation system that allows air into the drainage system when there is negative pressure, but does not allow any air out due to a sealing mechanism, which preventing foul smells from spreading.