... :Cast Iron,Ducticle Iron, Cast Brass SIZE DN50-300 Swing Check Valve BS4090 DN50-300 Design and Manufacture conforms to BS4090Flange ... -goal mainly produces Gate valve, globe valve, butterfly valve, check valve, fire valve, storm valve, air pipe head and each kind of ... , ABS and also acquire certifications of several classification societies. Swing Check Valve BS4090 DN50-300