DunAn Valve is held by DunAn Holdings Group , specializing in brass valves , iron valves and water meter with 15 years experience, offering over 1, 200 various kinds of brass valves , iron valves and water meters products . Now we rank top two in Chinese low and middle pressure valve field. In our workshop, we follow TPS (Toyota Production System) to guarantee our delivery time effectively, our monthly output up to 1.5 million pieces. Most of our customers come from Europe, Southeast Asia and South American, etc. We have many big trade partners, such as LG, Viessman, Mitsubishi, etc. We also own a professional inspection center which is approved by National Laboratory and also gained a lot of certificates as below. For brass valves : We have approved CE( Europe ) , KS (South Korea) .KIWA (Netherlands), DVGW (Germany) , WRAS (Britain ) , EN331 , CSA, UL , CUPC, ISO9001:2000 and ISO14001:2004 certificates etc .