1.Ductile Iron Resilient seat Gate valve AWWA C509 NRS 2.high quality and ... are: BS5163,DIN3352-F4,F5,AWWA C509 and socket end resilient gate valve, BS750 Hydrant, BS5153(L/W)copper seal swing ... countries, China Hong Kong, Taiwan and so on. Ductile Iron Resilient seat Gate valve AWWA C509 NRS