详细说明
产品说明： 应用规范 Application Norm: 1、设计制造按GB12235-59 Design Manafacfure According to GB12235-59 2、结构长度按GB12221-89 Face to Face According to GB12221-89 3、法兰尺寸按JB/T79-94 Flange Dimenaion Accoring to JB/T79-94 4、阀门检查和试验按GB13927 Valve Check and Test According to GB13927
