阀杆也应该在顶部配置方向指示器，用于当手柄拆卸下来时指示阀瓣的位置。
The shaft also shall have a directional indicator on top to indicate disc position when the handle is removed.
转动旋转滑阀15和离合器手柄到应急位置，指示器「应急「灯亮。
Turn both handles of the rotary slide valve ( pos. no. 15 ) and the clutch to the emergency position, and the annunciator " emergency " is lit on.
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