Abstract: A safety valve system includes a control valve connected to a gas meter and intersecting a gas flow path downstream of the gas meter and upstream of an entry point of a building. The control valve is adaptable between open and closed positions based upon received stimuli. A main gas supply line is mated to the control valve and includes auxiliary lines branching to appliances. A plurality of sensors are coupled in series to the appliances and are in communication with the control valve. A mechanism is included for transmitting a control signal to the control valve and for eliminating a fully charged gas line when the stimuli are detected by one of the sensors such that the control valve can allow and restrict gas flow to the appliances during operating and non-operating modes. Each of the sensors generates a unique control signal when the stimuli are detected.