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          double orifice air valve

          standard:Q/TF-B27P.01,BS,ISO,DIN
          PN10,PN16
          DN50-300
          material:grey cast iron,ductile iron
          leakage:GB/T 13927 class A

          There is one large and one small orifices. The large one is used to intake and release large amount of air and the small one is used to release the air during the course of water supplying. The main pipeline is DN400-1600mm.

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