Astral Air Admittance Valve

Negative Pressure Elimination Valve for Sewage. Astral’s Air Admittance Valves are designed to address the issue of negative air pressure that occurs in sewage systems when sanitary facilities are utilized. This negative pressure can lead to the siphons losing water due to the flow of sewage. Features: - Eliminates the generation of negative pressure in the system - Prevents the spread of sewer gases and bad odours - Helps to improve the performance of a sewage system – facilitates sewage discharge - Eliminates the possibility of water coming out of siphons - Reduces costs – smaller number of lead-through points in the roofs, not all risers have to be ventilated with a venting device - Helps to improve the flexibility of arrangement of sanitary fixtures – enables greater distance between the fixtures and the riser - A single product which is suitable for installation on pipes of different sizes - In the event of a fire, the valves reduce the risk of fire and smoke spreading via sewage pipes Specifications: Range: Negative Pressure Elimination Valve for Sewage Available sizes: Mini- 32 mm to 63 mm (designed for use in branched sections of the sewage system and in small risers); Maxi- 75 mm to 110 mm (suitable for use in sewerage rivers and branched sections with high flow rate) Standards: EN 12380, EN ISO 3126