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A normal air admittance valve has to be mounted vertically or nearly vertically . Maybe 5 degrees you could get away with but no more. On saying that you could probably get away a greater angle , say 45 degrees with a Hunter AAV ( one of my old designs ) as this valve operates by a spring...

Please stop calling them durgo valve,s. They are all air admittance valves, be it the pat3sons valve or the polypipe valve or the floplast valve or the studor valve or the durgo valve. they all do a similar job. Its like calling a dyson or a electolux a Hoover. They are all vacuum cleaners...

Air admittance valves do vent the sewer system. The are a one way valve which let air down into the sewer system but wont let foul air out. Basically if you have a row of say 8 houses, the 8th one should have a soil pipe venting to atmosphere, the rest in theory could use AAV,s The AAV...

They are all air admittance valves, be it , plumbplast, polypipe, floplast, studor, durgo. etc. They all do a similar job. Its like you say Ill hoover the carpet, but you might have a dyson. Durgo is what builders have come to call AAV,s over the years. That said, there are some AAV,s that are...