- API 6D ball valves are used in oil and gas industry pipeline system, including long-distance oil and gas pipelines and all levels of gathering pipelines, equivalent to the station area outside the transport, including ASME B31.4 and B31.8 pipelines, calibre range NPS4 ~ 60, to large diameter mostly, more than 95% are more than 10 inches, pressure rating Class150, 300, 400, 600, 900, 1500, 2500, generally fixed ball structure, inlet end sealing. , 1500,2500, generally fixed ball structure, inlet end seal.
- API 608 ball valves are used in petroleum, petrochemical and industrial applications, mainly used in ASME B31.3 process pipelines, calibre range NPS1/4 ~ 24, most of the smaller calibre, pressure ratings Class150, 300, 600, 800, generally for the floating ball structure, the outlet end seal.
- API 608 is in ASME B16.34 'flanged, threaded and welded connections of the valve' requirements outside the provisions of additional design, operation and performance requirements for general industrial users.
- Because of the special characteristics of long-distance pipeline project, the American Petroleum Institute developed API 6D 'pipeline and pipeline valve specification' standard, expressly the API 6D ball valve and API 608 ball valve in the structure and function of the difference between the other aspects.
- API 6D and API 608 ball valves according to the use of different conditions and needs, each has its own characteristics, together constitute a complete petrochemical field of ball valve specification.
