GB/T 21387-2008 in English

《GB/T 21387-2008轴流式止回阀》由TC188（全国阀门标准化技术委员会）归口，主管部门为中国机械工业联合会。
本标准规定了轴流式止回阀的结构型式、技术要求、材料、试验方法、检验规则和供货要求等。本标准适用于公称压力PN2.5～PN150、公称尺寸DN25~DN1800、温度不大于100℃的轴流式止回阀；其端部连接形式为法兰、焊接或螺纹连接；适用介质为水、油品、天然气等。

Scope

This standard specifies the structural form, technical requirements, materials, test methods, inspection rules and supply requirements of axial flow check valves. This standard applies to axial flow check valves with nominal pressure PN2.5～PN150, nominal size DN25～DN1800, and temperature not higher than 100°C; the end connections are flanged, welded or threaded; the applicable medium is water, Oil, natural gas, etc.