A gas flow control valve opens, closes and obstructs pathways to control pressure. This device is placed on appliances that use gas as a fuel source and operate manually or automatically. Although the control valve controls pressure, the device also improves safety by detecting when gas is being heated.
The control valve is important for controlling pressure and regulating the amount of gas a unit receives. Pressure is an important aspect of safety. Too much pressure can cause explosions or fires. Additionally, the unit can't operate properly or gas can't be ignited efficiently when pressure is low.
In some appliances, gas is ignited when it travels over the pilot light. This ignition process generates an increase in temperature. When a specific temperature is not reached, the control valve limits the supply of gas, which helps prevent potentially dangerous gas from leaking into the environment or lingering in an area.
Flow control valves are used commonly on appliances; however, they have a variety of other transportation, industrial, commercial and military uses. When control valves are operated manually, a pedal, hand wheel or lever opens and closes pathways. When valves work automatically, operation is driven by increases or decreases in flow, pressure and temperature.