Applicable/product standards: Steel gate valves design: api 600 / bs1414 Steel gate valves: iso 10434 / iso 14313 Steel gate valves: asme b16.34 Face to face according to: asme b16.10 Flanges ends according to: asme b16.5/asme b16.47 Butt welding ends according to: asme b16.25 Inspection and testing according to: api 598 / api 6d