*Type "DFF" Check Valves are designed in accordance with the requirements of API Spec.6A. *They are aminly used in the kill manifold to control kill fluids or other fluids, which are only permitted to flow onto the well and cna not return so as to perform the kill operation and other operations.
*Type "S" Check Valves are designed in accordance with the requirements of API Spec.6D. *API 6D Specification for Pipeline Valves *ASME B16.34 Valves - Flanged, Threaded and Welding End *ASME B16.5 Pipe Flanges and Flanged Fittings *NACE MR01-75 Rev. 2002 *ISO 9001-2000 Registered Quality System