A natural gas valve is a component of a gas furnace. It connects the natural gas line of the house to the furnace and controls the amount of gas that is sent to the manifold and burners.
Gas valves control the flow of natural gas that moves from a gas main line to a furnace. As of 2010, most new gas furnaces come equipped with natural gas valves. When a furnace is installed, the natural gas valve is calibrated so it properly senses the amount of gas, called gas pressure, that the natural gas lines are supplying it with.
The gas valve receives a signal from the gas furnace control board or module. This small computer tells the gas valve what the gas pressure is. The control board closes the safety switches in the furnace safety circuit and readies the main burner for firing. The control board then sends a signal that tells the valve to open so gas can reach the manifold and main burner.
Gas valves typically do not require any maintenance. Only if a gas valve is submerged or becomes too wet from moisture should it be replaced.
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