Handwheels and gear heads can be mounted on top of cylinders for operation in an emergency which may arise due to the loss of operating medium in the cylinder 手轮和齿轮头可以安装在缸体的顶部，用于在缸体内工作介质丧失时应急用。
2.
Handwheels and gear heads can be mounted on top of cylinders for operation in an emergency which may arise due to the loss of operating medium in the cylinder 手轮和齿轮头可以安装在液动执行机构的顶部用于出现缺乏运行介质的紧急状态下使用。
