Check valve
•   应用规范　Application Norm:

1.  设计制造按 12236-89
    Design Manafacfure According to 12236-89

2.  结构长度按 GB 12221-89规定
    Face to Face According to GB 122221-89

3.  法兰型式及尺寸 JB/T79-94
    End Flange Dimenaion Accoring to JB/T79-94

4.  阀门检查和试验按 API STD.598
   Valve Check and Test According TO API 598

•   主体材质 Main Material
    CF8、CF3、CF8M、CF3M、WCB