文中讨论了影响选型的诸多因素，如闸室平面尺寸、输水阀门工作条件、单级或多级船闸的影响等。
Besides, many affecting factors, such as lock chamber dimensions, lock valve conditions and single or multi flight lock situations have been discussed.
该阀门有四个功能：流量测量、止回、再循环控制和多级降压。
The valve has the four functions of flow measure, flow checking, recirculating control and multistage pressure reducing.
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