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2. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.

3. Component parts of internal combustion engines - Wikipedia

   en.wikipedia.org/wiki/Component_parts_of...

   A supercharger is a "forced induction" system which uses a compressor powered by the shaft of the engine which forces air through the valves of the engine to achieve higher flow. When these systems are employed the maximum absolute pressure at the inlet valve is typically around 2 times atmospheric pressure or more. A cutaway of a turbocharger

4. Air admittance valve - Wikipedia

   en.wikipedia.org/?title=Air_admittance_valve&...

   Retrieved from "https://en.wikipedia.org/w/index.php?title=Air_admittance_valve&oldid=309883018"

5. EHang - Wikipedia

   en.wikipedia.org/wiki/EHang

   Data from mobile geeks General characteristics Wingspan: 0.35 m (1 ft 2 in) Gross weight: 0.68 kg (1 lb) Propellers: 4-bladed Performance Maximum speed: 60 km/h (37 mph, 32 kn) Endurance: 25 min Service ceiling: 914 m (2,999 ft) Rate of climb: 2.5 m/s (490 ft/min) Hexacopter Ehang Hexacopter is a UAV developed by Ehang and it has not yet been named. The existence of this hexacopter was ...

6. AAV - Wikipedia

   en.wikipedia.org/wiki/AAV

   Air admittance valve, a valve in a drain-waste-vent system Aire d'attraction d'une ville , a metropolitan statistical area used by the French national statistics office INSEE Another Angry Voice , a British political blog

7. List of discontinued Volkswagen Group petrol engines

   en.wikipedia.org/wiki/List_of_discontinued...

   2) AFC use single valve springs with less mass. 3) AFC inlet and exhaust valves have a smaller stem diameter with revised stem oil seals. The AFC engine had a revised lubrication circuit and oil pan assembly, constructional detail includes 1) AFCs use a larger oil filter. 2) AFC engine oil cooler has a larger cross-sectional area.