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.
Function
The Brass 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.
Components
A typical gas burner control assembly is composed of several parts: a thermostat, a gas control valve, a pilot light tube and burner, and a main gas tube and burner. The thermostat controls gas flow through the main gas tube and burner. The pilot light is either lit manually and stays on all the time or is lit by electronic devices and only comes on to light the burner and then goes off again. Some water heaters don

2012-08-06

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