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Applicable standards and specifications Design and manufacturing: ASME B16.34/BS1868/ API 6D/API594/DIN3840/3356 Face to face: ASME B16.10/API594/DIN3202-F6/F1/EN558-1 End flanges: ASME B16.5/DIN2543/2544/2545 Butt welding ends: ASME B16.25 Inspection and test: API 598/API 6D/DIN3230/EN12266-1 Design descriptions BC, bolted cover Swing type, anti-rotation disc Renewable seat rings Non-penetrate disc shaft Horizontal or vertical service Flanged or butt-welding ends Lift type check valve BC, bolted cover Lift type, piston type disc Renewable seat rings Horizontal service Flanged or butt-welding ends Wafer dual-plate check valve One piece body Wafer butterfly swing type Dual-plate disc, long pattern Renewable split disc Horizontal or vertical service Wafer ends Available with flanged ends