| 摘要 |
The present invention relates to a valve device. In order to perform an air cleaning cycle to remove foreign materials from a cupola surface in accordance with an opening and closing time of a valve, a sequence control step of removing an expansion pressure of an expansion sheet while a cupola disk of a cupola valve is opened and closed and expanding the expansion sheet to be completely sealed when the cupola disk is completely closed additionally comprises a step of removing foreign materials from a surface of the cupola disk through air flushing of spraying high-pressure air to prevent the foreign materials from remaining; thereby extending the life of the valve and reducing the malfunctions of the valve. The cupola valve comprises a top plate wherein the expansion sheet is embedded and a body coupled to the top plate wherein the cupola disk is embedded. In a cupola valve sequence control method by which sequence opening and closing control is performed to maintain airtightness by allowing the expansion sheet to be in surface contact with the surface of the cupola disk in the opening and closing section of the cupola disk, when the cupola valve is driven from an opened state to a closed state, an air flushing step to clean the surface of the cupola disk is preceded and then the expansion sheet is completely closed by an expansion step to be completely closed and when the cupola valve is driven from the closed state to the opened state, the expansion sheet is contracted and then undergoes the air flushing step to open the valve. |
