... at this time, it allows the gas getting through. When there is a gas leakage, the gas alarm would send a pulse signal ... shut off the valve automatically, then the gas leakage is stopped. After the gas leaking problem solved, you have to pull ... . 2. Parameters :Target gas : Natural gas, LPG, coal gasConnection type : solenoid connectionPressure : 0-25KpaFlux : 2.5 cubic meter per hourMedium : airShut off ...