Control valve is a pipe attachment, which is used to change the channelcross-section and flow direction, the control flow of a medium transport device.
调节阀是一种管路附件，它是用来改变通路断面和介质流动方向，控制输送介质流动的一种装置。
2
Compared with other types of open channelcross-section, the cubic parabola shape open channel is one of the open channels which convey water more efficiently.
与其他形式断面渠道的比较结果表明，立方抛物线形断面渠道也是一种水力较优的输水渠道。
3
This paper presents the design of a new degree of freedom-channel with variable cross-section design.