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Shengli Oilfield Victory Oil Plant recently in the plant owned 4 oil mines to promote the use of gravity thrust type single-flow valve. This oil well water injection equipment is produced by the plant four mine engineering and technical management station developed in 2003. The water injection equipment in serious sand 48 injection wells installed after two and a half years, the efficiency of 97%, the average life expectancy of 870 days. This technical achievement won the first prize of the national petroleum industry quality scientific and technological achievements.