1. Drilling mud pump parts - valve casing 2. valve casing for mud pump 3. variables type 4. could be tailor-made by customer Qingzhou Petroleum Machinery Factory Co., Ltd (former Qingzhou water Pump works), built in 1966, taking up 200,000 square meters field area, 110,000 square meters built-up area, with general assets of 150 million yuan, enterprise staff of 1100 people, professional and ...