The primary purpose of both vents and valves is to regulate the pressure in the drainage system and, in this, they both perform equally well. The only real difference is in how they can be installed, and that's where an AAV can nose its way into the lead. Where can an Air Admittance Valve be installed?

Air admittance valves, also referred to in the industry as durgo valves, are basically a cleverly designed one-way valve that is fitted to the top of the soil pipe. When siphoning pressure builds up within the pipe system the valve opens to allow air in, balancing the pressure.

2014年12月13日 · A soil vent pipe (SVP) or soil stack pipe can be just that, a pipe to vent the system however they would normally be utilised to carry foul waste from upper floor toilets, sinks, baths and showers down to the below ground drainage system..

An air admittance valve (AAV) is an alternative option to fitting a vent in a soil pipe – a soil pipe vent if you will. It opens automatically when water enters the soil pipe and closes when the water has passed into the drain.

2024年12月30日 · So if AAV are not suitable, and I want to have internal soil pipes that terminate in the roof space, is the simplest solution to run an external SVP at the house end of the property, and then have AAV on the internal stack pipes?

2017年12月30日 · To resolve the partial vacuum problem you can fit an AAV inside the house, well above the highest outlet, in a position where it can be accessed for maintenance. This will open if there is a partial vacuum in the soil pipe and allow air to be drawn in, then close to prevent smells from escaping.

I think the open ventilation stack is required to relieve positive pressures in the below-ground ventilation system. Part H clause 1.33 has weasel words that require an SVP if the AAV(s) "adversely affect the amount of ventilation necessary for the below ground system".

2024年10月27日 · I've requested from our architect to have our drainage arranged with an AAV for each toilet. These will be contained in walls or boxing. This would look like this - My architect insists that the long run needs an open SVP running into the roof space as follows - Can anyone offer any insight on th...

Document H of the Building Regulations Clause 1.33 states that AAV’s should not be used externally or in dust laden at-mospheres, however due to the design criteria requirements of the termination of SVP’s within 3 metres of an opening

Durgo air admittance valves come in a wide range of sizes to fit the most common waste pipe dimensions. The valve model and dimension is chosen based on the calculated venting needs.