Solenoid valves, or solenoids, are devices that convert electrical energy to mechanical energy, thereby creating a magnetic reaction; this occurs every time an electric current makes its way through the wire in the solenoid. When a device is forced into motion, the solenoid activates it. These devices are usually used to power fluid and hydraulic systems.

Solenoids have different functionalities; they can be used to start your car or activate your sprinkler system. The main function of a solenoid valve is to control the flow in fluid and air powered systems and motors.  These devices switch off, expel or mix fluids to power specific devices.

Let’s take a look at different types of solenoid valves.

Solenoid valve1

Different types of solenoids

Direct-acting valves

These solenoids have a coil that magnetically opens the valve in a direct action, causing the shaft and the seat of the valve to shift. Direct-acting solenoid Valves use the energy produced by the magnetic field of the solenoid to operate the valve. When the electrical current is removed, a mechanical spring returns the valve to its original position.

Direct-acting valves are utilised to prevent the development of too much pressure in a device.


Pilot-operated valves

Solenoid valve2In pilot-operated valves, the plunger opens up the pilot opening while the pressure causes the valve to open and close. In spite of the fact that pilot-operated valves require less electrical energy to work, need to keep up full power with a specific end goal to stay in an open state, and they perform at a slower rate than direct-acting solenoids. Direct-acting valves just need full power when opening the valve, as they can hold their vacant position notwithstanding when working on low power.






Two-way valves

This is the most common type of solenoid valve. Two-way valves have two ports, which are used alternately to allow flow as well as close it off. A two-way valve can be “normally open” or “normally closed” in its operation. With a normally open valve, the valve remains open until a current is applied to close the valve. When the electrical power is suspended, the valve automatically reopens to its normal state. A normally closed solenoid valve remains closed until a power source causes it to open.

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