Gate has two sealing surfaces, the most commonly used wedge gatevalve sealing surface to form two wedge-shaped, wedge Angle parameters vary with the valve.
闸板有两个密封面，最常用的楔式闸板阀的两个密封面形成楔形，楔形角随阀门参数而异。
2
The open angle indicating device should display the open state of the valvegate exactly.
开度指示机构应准确地显示阀门的开启状态。
3
Gate, Globe, Angle and Check Valve Figure Number System.