| 摘要 |
The present invention relates to an apparatus for indicating opening or closing of a valve. The apparatus for indicating opening or closing of a valve comprises: a cylinder to open and close a valve; an indication unit installed in a space separated from a space in which the valve is disposed to indicate opening or closing of the valve; a pair of limit switches to transfer an electric signal to the indication unit; a first hydraulic line whose one end connected to a head portion of the cylinder and whose the other end is connected to any one of the limit switches; and a second hydraulic line whose one end connected to a rod portion of the cylinder and whose the other end is connected to the other one of the limit switches. The indication unit receives the electric signal from a limit switch among the limit switches which is operated by an oil pressure supplied by the first hydraulic line or an oil pressure supplied by the second hydraulic line to indicate opening or closing of the valve. The apparatus for indicating opening or closing of the valve in accordance with the present invention connects the hydraulic lines to the head portion and the rod portion of the cylinder disposed to open or close the valve, and operates the limit switches by the oil pressure transferred from the hydraulic lines to use the electric signal generated by the limit switches to clearly indicate an opening angle of the valve. |
