1). Desing And Manutacture: API 6D, ANSI B16.34, BS1868 2). Face to face/End to end: ANSI B16.10 3). Flange dimensions: ANSI B16.5 4). Butt welding dimension: ANSI B16.25 5). Pressure temperature lating: ANSI B16.34 6). Inspection and test: API 598 API 6D Swing check valve Major parameter 1). Size: 2"-48" 2). Class: 150Lb--900Lb 3). Material: A105 WCB WCC WC6 WC9 LCB LCC CF3 CF3M CF8 CF8M 4). Duplex stainless steel Wooden Case