![]() ![]() It is a convenient round number for reference purposes and is normally only loosely related to manufacturing dimensions. Nominal size– the nominal size (DN) is a numerical designation of size that is common to all components in a piping system other than those using valves, fittings, couplings or tubes that are designated by the outside diameter. In the case of angle pattern valves the inlet should be vertical. For the purposes of this standard any line with a slope (upward or downward) of 5° or less is deemed to be horizontal. When swing check valves are used in vertical lines the flow must be in an upward direction. The terms “vertical”, “horizontal” and “angle” relate to the axes of the body ends. Iv) disk type, for vertical flow (see Figure 5). Iii) ball type, for vertical flow (see Figure 4) Ii) ball type, for angle or horizontal flow (see Figure 3) I) piston type, for angle or horizontal flow (see Figure 2) BS 1868: Specifications for Steel check valves (flanged and butt-welding ends) for the petroleum, petrochemical and allied industriesīS 1868 Standard specifies requirements for cast steel check valves or forged steel check valves with flanged or butt-welding ends of the following types:Ī) swing, for vertical or horizontal flow (see Figure 1) ![]()
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