Model Number: AIR VALVE-#0352 Brand Name: ZXF or OEM Key Specifications/Special Features: Double ball air valve, double orifice, PN10, PN16, PN25, DN50-DN300Body materials: ductile iron (GGG50)Design standard: DIN3352Flange standard: DIN 2501 (EN1092)Test standard: BS6755Working temperature: 0-80°CSize: DN50-DN300mmBall: ABS or SS304/SS316Coating: blue epoxy powder, 250micron thickness

Double orifice air valve that combines both large orifice and small orifice functions within one unit
Large orifice allows air to be expelled from the system during filling of a pipeline and admit air back into the system whenever sub-atmospheric pressure occurs
Air is vented from the system until water enters the valve and lifts the float against its seat, ensuring a tight seal
In the event of sub-atmospheric pressure in the system, the water level drops causing the float to fall from its seat and allow the admission of air

During normal working of the main the small orifice releases the air which accumulates under pressure with the main in operation, the float is normally against its seat
As air enters the chamber body the water level is depressed until a level is reached when the float drops from its seat, which allows air to escape
Consequent rise in water level returns the float to its seat