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Read the operation instructions carefully before preparing for 1.1 valve operation. 1.2 Before operation, the flow direction of gas must be clear, and the valve opening and closing sign should be checked carefully. 1.3 Check the appearance of the electric valve to see whether the electric valve is damp, if damp, dry treatment; if other problems are found to be dealt with in time, no malfunction operation. 1.4 pairs of electric devices that have been out of service for more than 3 months.