... TUV CERT ,ISO9001 - 2000, WO , PED.7)Standard: ANSI B16.5, B16.47, MSS, SP-44, AWWA, API, DIN, JIS, HG ... , GB, JG, BS.8)All the flanges are according to the ASTM ... , BS, DIN, JIS, EN, GB and customer's request.Ding Xiang ... 7 standards, i.e. ANSI ,API ,MSS ,AWWA , DIN ,JIS ,BS as well as GB ,which size 1/2"(DN15) to ...