Steel check valves, API 6D Steel check valves, ISO 14313 Steel valves, ASME B 16.34 Face to face, ASME B 16.10 End flanges, ASME B16.5 Butt welding ends, ASME B16.25 Inspection and test, API 598/API 6D Design description: BB, Bolted bonnet cap Swing type, anti-rotation disc Seat rings integral with body Non-renetrate disc shaft Horizontal or vertical service Flanged or butt welding ends Cast Stainless Steel Swing Check Valve 300Lb Cast Stainless Steel Swing Check Valve 600Lb Fig. No: Note: 1). Spiral wound construction, tefon optional. 2). NPS 6" & Larger. 3). Disc and seat (Integral with body) may either be solid facing material or a base material equal to or better than the body/bonnet material with facing as shown.