4.D-Series reliable pneumatic rack and pinion actuators. Designed for operation of plug, butterfly, ball valves, and other 90º turn devices. They are compact and lightweight, making them suitable for installation within areas of tight piping connections.

Bettis D系列可靠的绞齿轮式气动执行器，是专门用于球阀、蝶阀、旋塞阀等90度回转的阀门执行机构。它们精巧结实，特别适用安装在管道连接要求较严格的工况下。有双作用和单作用弹簧回位两种形式。