According to structural characteristics of a flapper valve, flapper valves, butterfly valves, ball valves, diaphragm valves, Angle valves, through the valve, three-way valve.
根据结构特点有挡板阀、插板阀、蝶阀、球阀、隔膜阀、角阀、直通阀、三通阀。
In this paper, the authors research the structure and kinematics of planar ball drive, derive formulas of transmission ratio according to the structural feature and analyse driving characteristics.
本文研究平面滚珠传动的结构及运动学，根据结构特征，推导传动比公式，分析传动特点。
This article describes the double-eccentric semi-ball valve's performance, structural characteristics and the scope of application.
介绍了双偏心半球阀的性能、结构特点及应用范围。
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