Cast Iron Swing Check Valve BS4090 DN50-300 Materials:Cast Iron,Ducticle Iron, Cast Brass DN50-300 Cast Iron Swing Check Valve BS4090 DN50-300Design and Manufacture conforms to BS4090Flange Drilled ... , strict operation system.2.V-goal mainly produces Gate valve, globe valve, butterfly valve, check valve, fire valve, storm valve, air pipe head and each kind of ...