Shandong Changqing Petroleum Hydraulic Machinery Co., Ltd. is a famous enterprise in China Petroleum Equipments Industry, that mainly engaged in the design, manufacture and sales of the mud dosing pump equipment for petroleum&gas well and their spare parts. We have two series mud pumps F series mud pump(range from 500hp to 2000hp) and 3NB series mud pump(range from 350hp to 1600hp).Any news to (yoursbill at yahoo dot com dot cn) is appreciated. I wish we can offer you the best products and service.