BS 1868:1975+A1:1990
石油、石化及联合工业用钢制止回阀(有法兰及对焊端)用规范

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适用范围: This British Standard specifies requirements for cast or forged steel check valves with flanged or butt-welding ends of the following types: a) swing, for vertical or horizontal flow (see Figure 1); b) lift: i) piston type, for angle or horizontal flow (see Figure 2); ii) ball type, for angle or horizontal flow (see Figure 3); iii) ball type, for vertical flow (see Figure 4); iv) disk type, for vertical flow (see Figure 5). The terms “vertical”, “horizontal” and “angle” relate to the axes of the body ends. When swing check valves are used in vertical lines the flow must be in an upward direction. For the purposes of this standard any line with a slope (upward or downward) of 5° or less is deemed to be horizontal. In the case of angle pattern valves the inlet should be vertical.

BS 1868:1975+A1:1990石油、石化及联合工业用钢制止回阀(有法兰及对焊端)用规范