... motor & diesel engine 3.3NB series, F series, PZ series 4.API standards QF series triplex drilling mud pump is horizontal triplex single acting ... with each other in F series. Qingzhou Petroleum Machinery Factory Co., Ltd (former Qingzhou water Pump works), built in 1966, ... . The leading factor products SL3NB, QZ3NB, QF,QZ series drilling mud pump and compound drive groups are mainly used in oil ...