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BS 5157 1989 Edition, July 31, 1989
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Steel Gate (Parallel Slide) Valves
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Carbon and alloy steel valves having hard metal, nickel alloy or stainless steel facings. PN 16, PN 25 and PN 40 valves having flanged ends and Class 150, 300 and 600 valves with butt-weld ends and flanged ends in the ranges of nominal sizes DN 40 to DN 600 and 11⁄2 to 24 inclusive.