For large vertical axial flow pumping station, the area of flap valve can be 15%~20% of area of rapid-drop gate.
对大型立式轴流泵站,一般分流拍门面积可取快速闸门面积的15%~20%。
参考来源 - 大型立式轴流泵站快速闸门上分流拍门面积的确定—《南水北调与水利科技》—2010年第3期—龙源期刊网·2,447,543篇论文数据，部分数据来源于NoteExpress
Lift check valve with a spring load can withstand light valve flap, flap valve lift is not high.
升降式止回阀使用一个可承受弹簧载荷的轻量阀瓣，阀瓣的升程不高。
This valve is normally automatic work, in a direction of flow of fluid under pressure, open the flap valve;
通常这种阀门是自动工作的，在一个方向流动的流体压力作用下，阀瓣打开；
Based on a systematic analysis of the movement of the flap valve, a mathematical model with constraint conditions and objective functions is established.
文中通过对拍门运动的系统分析，建立了带有约束条件和目标函数的数学模型。
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