Abstract: Ilnder conditions of submerged flow, the lifting force acting on the lip of slide valve was generally obtained throughmodel tests in the past. The author presents a method of calculating the lifting foree in this paper.It is assumed that flow under bottom

Key words: lifting force acting on lip of valve, loss cocfficient of valve section in culvert, valve coefficientof hydro-dy-namic pressuse

摘要： 以往平面阀门在淹没出流下底缘上托力系靠模型试验获得．本文着重叙述了底缘上托力的计算方法．当阀门底缘斜面迎向上游时，假定底缘水流不分离情况下，利用势流理论分析并提出底缘动水压力系数Ｋ的计算公式：底缘上托力Pt=r.A(KH+h0），计算值与试验成果比较，基本一致．计算方法可供今后采用类似阀门底缘形式的平面阀门设计及启闭力计算参考．

关键词: 阀门底缘上托力, 阀门段阻力系数, 阀门动水压力系数