... current situations of China.It has the features of novel design,simple and reliable institutions,very easy for the installation ... and maintenance of pipes. 2:Excutive Standard standard for design,process,test:GB/T12465-2007 Flange connection:GB/T17241-1998 ... markDesign codeMain body,Gland,Limited short pipe.Carbon steel,Quality carbon steel,Nodular cast iron,Stainless steel.Q235-A,20,35,45,QT400-15 ...