... system 2.DN100,125,150,200 3.working pressure:1.2mpa 4.material:cast iron,brass,stainless steel wet alarm ... valve top quality automatic and manualMaterial:1.valve cap:cast iron2.valve body:cast iron3.valve seat ... ,150mm, 200mmFlow coefficient : 15~60 (L/min)Nominal working pressure: 1.2MPaStrength test pressure: 4.8MPaFriction drag: < 0.07Mpaalarm bell : >80db ...