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Single acting ON-OFF valve. it is air to open. when sov energized , valve will be open, so during that if air fail then what will be the condition of valve ( open or close ) ???
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Answer Posted / kausar
If it has airlock then it will be remain same because at the time of pneumatic failure it locks the air automatically.generally now with control valve airlock,booster ,sov and air filter regulator are arranged in order to make the line safe
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