A gas oven safety valve is a built-in security system inside gas ovens that stops the flow of gas into the appliance unless ignition is assured. A gas oven can be ignited through a pilot flame, electric glow bar or a direct electric spark.
The gas oven's safety valve is incorporated as part of its ignition system. In a pilot light system, the safety valve is only released if there is sufficient fluid pressure or an electric current. A gas oven with a direct electric spark uses the safety valve as a conduit for an electric spark. If there is no ignition after two sparks are sent, the safety valve locks out the oven burner. In the glow bar system, electricity passes through the glow bar, which releases only enough electricity for ignition to the safety valve once the bar reaches a certain temperature.