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1089 Cast Steel Three Piece Design Ball Valve, Class-150 (Flanged) Salient Features Design Standard BS EN ISO 17292 (BS 5351). Flanged Ends to ANSI B16.5 Class-150 (Drilled). Three Piece Design. Superb in Quality and Performance. Test Pressure (Hydrostatic) : Shell : 31 kg/cm²g (440psig) Seat : 21kg/cm²g (300 psig) Seat (Steam) : 10.55 kg/cm²g (150 psig) Maximum Working Temperature : 220°C