The automatic air release valve releases accumulated air from the system while it is under pressure. This The presence of air in a water system can reduce the effective cross sectional flow area resulting in increased head loss and decreased flow. Unwanted air may also cause water hammer and metering inaccuracies, while hastening corrosion. In spite of its compact and light weight structure; it has a 12mm2 orifice that enables it to discharge air at high flow rates and is less susceptible to obstruction by debris.