... 0101423.2. And the patent name is a flow reversing device for mass flow meter measuring.Even certification through ... name item nameDaqing Oilfield,Chinafeedstock,light gasoline,high temperature residueHuabei Oilfield,Chinawater,sewage,Single well oilwater,sewage, ... well oilnatural gas,base oilShengli Oilfield,China high temperature residue,natural gas,sewage.Zhongyuan petroleum,Chinawater,sewage, ...