software release / even small gas leaks / large systems / gas valve fixing ring / gas flow / gas system / electricity / card software / gas valve / gas pressure value / protection devices / shutoff devices / bank / cut-off devices / natural gas operation / extraction/suction systems / safety devices / regular gas flow / gas supply / natural gas / card software release / energy saving / electricity line / water solution / chemical products / gas supply pressure / water systems / gas nozzle / gas cock / /