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1. Body: cast iron/ductile iron
2. Ball: stainless steel
3. Bracket: plastics
4. Sealing gasket: NBR
5. Bonnet 1: cast iron/ductile iron
6. Bolt/nut: carbon steel
7. Bonnet 2: steel/iron
8. Bolt/nut carbon steel
9. Design: EN1074-4
10. Flange end: EN1092-2
11. Working pressure: PN10, PN16
12.Size:DN50-DN300
single orifice air valve
