| 摘要 |
PURPOSE: An indication device for the opening and closing state of a valve is provided to prevent a person from wrongly manipulating a valve by indicating the present and opening and closing states of the valve. CONSTITUTION: An indication device for the opening and closing state of a valve comprises a case (2), an indicating part (4), and a control part (6). The case has an inner space, and one surface thereof is open. The indicating part is located inside of the case and indicates the present and opening and closing states of a valve. The control part is supported to the case and enables a user to control the opening and closing state of the valve indicated on the indicating part. [Reference numerals] (4a) Closed; (4b) Driving |
