The rotaflex pumping units has mixed together major features and advantages of all kind of pumping units through years of research and development. As a unique engineering breakthrough, the 100% mechanical rotaflex is especially suitable for producing high volume fluid in deep wells with rod pump and heavy oil recovery. We had developed up to seven types. Lots of products had been exported to america, canada, cuba, argentina, kazakhstan, uzbekistan, middle east and other countries in addition to be using in shengli, dagang, liaohe oilfield and almost every big oilfield in china. It has proved that the pump unit with the international advanced level combines the advantages of high efficiency, reliability and energy saving.