Buttefly Valve DN50 ~ DN4000 Product Description Butterfly Valve, Standard compliance 1) Design and manufacture: API609 2) Test and inspection: API598 3) Face to face dimensions: API609, ANSI B16.10 4) End flange dimensions: ANSI B16.5, B16.47 SERIES A & SERIES B, DIN, BS, JIS 5) Butt-welding end: ANSI B16.25 Specifications: 1) Size: DN50 ~ DN4000 2) Class: 150LB to 300LB 3) Type: Wafer type, lugged type, flanged type,