... designed before are served as reference. Design & Manufacture standardsMSS SP81;JB/T 8691-1998Face to Face DimensionMSS SP81,MSS SP135,ASME B16 ... DIN2532,ASME B16.47,MSS SP81,BS4504,JISB2212;GB/T 9113.1;JB/T 79-94BW Connection DimensionASME B16.25Pressure-Temperature RatingASME B16 ...