真空角阀在真空系统中主要用于前级泵和抽气管道上进行真空隔绝，又称真空挡板阀。真空角阀常用是90°直角阀，也有180° Y 型水平安装阀门。真空角阀的连接法兰有KF、ISO、CF 标准真空法兰。真空阀门的驱动方式有手动和气动，气动是通过气缸的往复运行开启和关闭阀门。

    根据开启和关闭方式有单作动和双作动二种，单作动是通过气缸开启阀门，内置弹簧关闭阀门。双作动阀门的开启和关闭都是通过气缸运行来实现。

真空角阀的密封方式有轴封式（O-ring）、成型波纹管、焊接波纹管。不同工况选择不同的阀门密封方式，轴封式(O-ring) 适合比较严苛和工作节拍快的工况。超高真空系统需要选择成型波纹管或焊接波纹管，能够保证真空系统更好的漏率。焊接波纹管的伸缩量要优于成型波纹管，更有利于阀门的大开度，没有流导的影响。

    Vacuum angle valves are primarily used for vacuum isolation on forepumps and pipelines in vacuum systems. Commonly used types of vacuum angle valves include 90° right-angle valves and 180° Y-shaped valves. The connecting flanges of vacuum angle valves include KF, ISO, and CF standard vacuum flanges. The driving methods for vacuum valve include manual and pneumatic operations. Pneumatic operation involves the reciprocal

movement of air to open and close the valve. There are two types of actuation according to the opening and closing methods，single-action and double-action. Single-action valves are opened by a cylinder and closed by an internal spring. Double-action valves are opened and closed by the operation of a cylinder.

    The sealing methods for vacuum angle valves include shaft sealing (O-ring), bellows, and welded bellows.Different valve sealing methods are selected for different working conditions. Shaft sealing (O-ring) is suitable for harsh working conditions and fast working rhythms. Ultra-high vacuum systems require the selection of molded bellows or welded bellows to ensure better leak rates in the vacuum system. The expansion and contraction of welded bellows is superior to that of molded bellows, which is more conducive to large valve openings without the influence of flow conductance.