FloPlast AV32 32mm Air Admittance Valve-Compression, White

Product Information

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. Let's get one thing clear straight off the bat...if your property uses a sewage treatment plant, septic tank, or cesspool instead of a connection to the mains drains, there must be AT LEAST one open vent in the system to prevent a dangerous build-up of gases. Air Admittance Valves can be installed in addition to, but should never be installed in place of a vent pipe for off-mains systems. Specific Size Air Admittance Valves: Ranging from 32mm to 110mm, these valves cater to specific pipe diameters, offering a more precise fit and seal for systems with known pipe sizes.

As you can see, the advantages of using them are many but, as with all things, there are also some disadvantages.Locate the highest point in the room, in most cases this will be the sink plug hole and use a spirit level to transfer the height of this point over to your install area and then mark the wall. However, like the 110mm versions, the smaller ones must also finish above the highest flood level of the room the valve is in e.g. in the case of the basin above, it must be higher than the overflow of that basin. The biggest potential issue is failure of the product itself. As with any product with moving parts, it could fail and stop working and therefore allowing bad smells into the home. Sometimes the first tell tale sign will be the familiar gurgling from plughole or “drain smell” coming from them. This is why I’ve recommended only installing one in an area that is easy to access because then in this case it’ll be easy to remove and replace the broken fitting. One way to avoid this is by purchasing a well known brand who make high quality, tested and approved products like the ones we sell here at EasyMerchant. All pipework contains air and in it’s natural state it sits in the pipes at the same atmospheric or neutral pressure that any other undisturbed air sits at.

Durgo Valves, commonly known as Air Admittance Valves (AAVs), are critical components in modern waste plumbing systems. They are designed to allow air to enter the plumbing system when negative pressure is sensed, preventing the loss of water seals in traps which can lead to unpleasant odours and unhygienic conditions. Practical Uses of Durgo Valves 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. Air Admittance Valves are very cleverly designed to allow the free entry of air into the pipework system without allowing any foul odours or gases to escape out. They achieve this through the use of a diaphragm that keeps the valve closed under normal atmospheric pressure (or if pushed up by positive pressure in the system) but opens it when pulled down by negative pressure in the system. 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.By fitting the valve, in this scenario it will prevent any foul smelling gases from escaping into the inside of your home as the valve seals the top of the pipe when closed and only opens to draw air in. 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. In terms of how an air admittance valve works, the whole system revolves around a spring loaded valve. The valve labeled D in the below image is held under the pressure of a light spring which holds the valve closed during times of non activity. As we have stated above, fitting a larger 110mm air admittance valve is usually a case of installing it at the top of a section of soil pipe when it’s not possible to vent it externally as you normally would. How high should you install the air admittance valve? The short answer is a minimum of 200mm above any water entry point. So if you imagine your soil pipe run, then durgo valve / AAV must be fitted above the highest connection to the soil pipe from any sink, bath or toilet that is connected to it. Usually you’ll find the installed at the very end of the soil pipe. If you need to, you can install them in line using a soil pipe junction.

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. There are two scenarios to installing an AAV, the first being installing it into existing waste pipework and the second as part of a brand new installation of a sink, bath or the similar. In the majority of cases it will be into existing pipework after a pressure issue has been identified. 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 good and useful as air admittance valves can be they can also cause some problems, especially when they become old and worn.To make the cut, you may find it easier to remove the entire section of pipework from its current location and do the cutting somewhere with a bit more space. This will ensure your cuts will be much straighter, however if all the fittings are solvent welded this isn’t easy as you will still have to cut the section of pipe out and then use straight couplings or joiners either end to refit it once complete.

Sometimes a pipe vent above roof level is not always possible, this is where you might use an air admittance valve. Reasons why you may not be able to use a vent above roof level is that there may be a neighbour with a loft conversion, or surrounding taller buildings, or when the building has roof windows. As a general rule, a soil pipe vent should never be vented less than 3m from a window otherwise you or your neighbours will be gassed out by foul odours coming from the vent! Sometimes it may be easier to use the air admittance valve inside even if there are roof windows, but to simply box it in using plasterboard to hide it as a pipe would usually. Air admittance valve installation height 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. Install air admittance valves at least 200mm above the highest waste water entry point on a 110mm waste pipe 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. 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.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. 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.