Check valve Check the quiet operation of the opening and closing of valves; check for gas leaks by using aqueous foam or gas leakage alarm.Types of safety valve Check the quiet operation of the opening and closing of valves; check for gas leaks by using aqueous foam or gas leakage alarm.Electromagnetic valve types check for gas leaks by using aqueous foam or gas leakage indicator, check the electrical valve openingValve level III Check for gas leaks by using aqueous foam or gas leakage alarm.Van gascook Check for gas leaks by using aqueous foam or gas leakage alarm.
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