3/31/2024 0 Comments Bs 1868![]() ![]() 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) Specification for steel check valves (flanged and butt-welding ends) for the petroleum, petrochemical and allied industriesīS 1868:1975+A1:1990 specifies requirements for cast 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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