Gas solenoid valves use electrical impulses to control the flow of gas through a line or chamber. They can have one or multiple inlet/outlet ports and come in direct acting or pilot operated configurations. They are used in commercial and residential applications, such as pneumatic machinery, manufacturing plants, furnaces, and gas-operated dryers.
A gas solenoid valve consists of parts that receive electrical impulses and then translate those impulses into mechanical movements. When the gas solenoid valve receives an electrical impulse, it opens or closes the valve, controlling the flow of gas through a line or into a chamber. A gas solenoid valve can be found in many applications, including commercial and residential devices.
The coil located inside the gas solenoid valve housing receives its electrical currents from automatic sensors or switches that are controlled by a person. The solenoid converts the electrical impulses received by the coil into mechanical energy. This energy moves the mechanical parts inside the valve to open or close the valve, which affects the amount of gas that can flow through the valve at the moment.
Gas solenoid valve configurations vary, with some valves having only one inlet port and one outlet port and other valve configurations having multiple inlet and outlet ports. A direct acting valve has a plunger that moves back and forth, either blocking the gas passage or allowing only a certain amount of gas through the valve. Two-way direct acting valves have inlet and outlet chambers, with a small passageway between the chambers for the plunger to slide through. The three-way direct acting valves have the same configuration, plus a relief port through the plunger assembly.
Pilot operated valves have a plunger that opens or closes a pilot port where gas is not flowing. Instead, the movement of the plunger affects the amount of pressure in the valve, which in turn controls the amount of gas flowing through the valve. A pilot operated valve has inlet and outlet chambers, with a diaphragm separating the chambers.
Commercial uses of gas solenoid valves include any pneumatic machinery that uses gas pressure to move parts of the machinery. Large valves within manufacturing plants could use solenoid valves to control the movement of gases used in manufacturing processes. Dental offices have solenoid valves that control the airflow through the examination chairs, allowing the chair to move up and down.
Residential applications include solenoid valves inside furnaces that control when natural gas ignites and is ignited by the pilot light to create heat. Natural gas powered vehicles use solenoid valves to control the flow of gas into the engine cylinders. Gas-operated dryers have solenoid valves that control the flow of gas into the dryer, helping to prevent gas poisoning or a fire.
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