引气活门，气源系统内，使来自发动机或辅助动力装置的空气进人气源支管的活门。

BLEED valve, a valve in the pneumatic system for air supply from the engine or auxiliary power unit to the pneumatic manifold.

youdao

盘式活门，(老式叫法：蝶形活门)，利用作动简进行操作，安装在管道上的旋转装置。用来控制管道的通断。

DISK VALVE (OBSOLETE TERM - BUTTERFLY VALVE), an actuator-operated, rotating device in a duct for closing and opening the duct passage.

youdao