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Salient Features Design Standard BS EN ISO 17292 (BS 5351). Flanged Ends to ASME B B16.5 Class – 150 (Drilled). Three Piece Design. Superb in Quality and Performance. Test Pressure (Hydrostatic) : Shell : 31 kg/cm²g (440 psig) Maximum Working Pressure : 21 kg/cm²g (300 psig) Seat (Pneumatic) : 7 kg/cm²g (100 psig) Maximum Working Temperature : 220°C