ISO 19240:2017规定了衬里金属直角回转阀（旋塞阀、蝶阀、球阀）和带法兰、对夹和对夹凸耳阀体类型的止回阀的设计、尺寸、材料、制造和生产测试要求。 它包括公称尺寸DN为: - 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 750, 800, 900, 1 000, 1 200; 对应于标称管道尺寸，NPS 1/2至NPS 48，并适用于压力名称: -PN 10、16、25、40； -150班，300班。

ISO 19240:2017 specifies requirements for design, dimensions, material, fabrication and production testing of lined metal quarter turns valves (plug valves, butterfly valves, ball valves) and check valves with flanged, wafer and wafer lug body types. It covers valves of the nominal sizes, DN: - 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 750, 800, 900, 1 000, 1 200; corresponding to nominal pipe sizes, NPS 1/2 to NPS 48, and applies to pressure designations: - PN 10, 16, 25, 40; - Class 150, 300.