How Do Gas Solenoid Valves Work?

solenoid valve

How Do Gas Solenoid Valves Work?

Solenoid valves are electrically actuated valves that are used to control the flow of air in gas piping systems. Because most solenoid valves have a spool or poppet designed, they are ideal for different functions and applications.

The spool or poppet of the valve attaches to a ferrous metal plunger that is normally spring-centred or spring offset. The plunger slides within a core tube of non-ferrous metal; itself encircled by a coil of electrical windings.

Coil exists with any range of voltage from 12-24 Vdc to 230Vac. A magnetic field is created when power is sent through the coil. This will push or pull the plunger, activating the valve. Solenoid valves make mechanization of fluid and gas control possible.

Modern solenoid valves provide fast operation, high reliability, long service life, and compact design. Your solenoid valve supplier, such as Comet Integrated can offer you “normally-open” and “normally-closed” versions, which means normally-flowing and normally-blocked respectively.

How Does a Gas Solenoid Valve Work?

Step # 1 

The valve is regulated by electrical current that passes through the solenoid.


Step # 2

When power is energized, a magnetic field is created and the valve’s plunger drops down seals against orifices and closes the valve.

electrical current passing through a solenoid valve

Step # 3 

Pressurized liquid or gas flow is stopped.

solenoid valve controller

Step # 4 

When the coil is de-energized, the plunger is able to be pulled and reset. The valve unseals the orifice and opens the valve.

solenoid valve controller

Step # 5 

This allows the pressurized liquid or gas to pass the valve.

solenoid valve controler 2

Why Is a Solenoid Valve Used?

A solenoid valve is used because, in most gas piping applications, it is required to stop the flow of gas in the system in the event of a gas leak.

This is one of the main functions of an electronically operated solenoid valve whereby the operator may no longer be able to use gas when there is a gas leak.

One of the biggest advantages of a solenoid valve is that it can be positioned in remote locations and may be easily handled by simple electrical switches. Their most common uses include to shut off, release, or distribute gases.


Where Are Solenoid Valves Used?

These valves have a wide variety of applications including a broad range of industrial settings. They are used for general on-off control, plant control loops, process control system and several original equipment manufacturer applications, and much more.

The most common sectors where you can find solenoid valves are:

  • Water supply
  • Gas chromatography
  • Compressors
  • Building services
  • Gas mixture regulation
  • Purification/ treatment of grey and black water
  • Firing systems
  • Treatment of drinking water
  • Water mains protection and fire extinguishing systems
  • Wastewater treatment
  • Oil and gas burner control
  • Control of cleaning processes
  • Large heating systems, climate control
  • Cooling, lubrication, and dosing
  • Pressure relief and drainage
  • Transport and tank facilities
  • Blood analysis instruments
  • Machine and plant engineering


It is important to select the solenoid valve according to the function you want. Keep in mind, that the most important parameters for selecting a solenoid valves are the voltage value, operating pressure and the application’s usage.

It is best to consult your solenoid valve supplier, such as Comet Integrated to ensure you are buying the one that is right for you. For more information, get in touch with our friendly staff.