Solenoid actuators, working & applications

What are solenoid actuators?

Selenoid Equipment used to convert electrical signals or electric currents into mechanical linear motion. Made of the movable coil and iron core. The pulling and pushing strength is determined by the number of turns on the coil.

An important aspect of the solenoid is a jolt. A small jolt will produce a high level of operation, and the power needed is also small.

The solenoid Valve Solenoid valve is a combination of two basic functional units, namely:
1. Solenoid with its core and components
2. The valve body where there are plates/plugs positioned to stop/flow the flow.

The flow can flow depending on the core movement and depends on whether the solenoid has flowed or not. If the current flows, the coil will push the core to open the channel/valve, and when it is not flowing, the channel will be closed.

The solenoid valve is used to control hydraulic, pneumatic and water flow. This solenoid valve is suitable for use in one-way flow only, with the pressure given at the top of the channel disc.

Working principle of solenoid valve:

Inside the solenoid, there is a coil that is circular in a special way. When you send an electric current through a wire (energy), a magnetic field is created. The inner shaft of the solenoid is a piston like a cylinder made of iron or steel, called a plunger or slug (equivalent to a dynamo). The magnetic field then applies strength to this plunger, either pulling or pushing. When the magnetic field is turned off, the spring plunger then returns to its original state.

electromagnetic coil

When an electric current passes through the windings of the coils, it behaves like an electromagnet and the plunger, which is inside the coil, is attracted towards the centre of the coil by the configuration of magnetic flux inside the body of the coils. coils, which in turn compresses small spring attached to one end of the plunger. The force and velocity of the movement of the pistons are determined by the force of the magnetic flux generated inside the coil.

Pneumatic solenoid valves:

Image result for Pneumatic solenoid valves construction'

This is a rotation version of the solenoid. Usually, the magnet stays outside, and the coil part moves in the arc controlled by the flow of current through the coil. Rotary coils are widely used in devices such as disk drives. is a switch for flowing air into pneumatic actuator devices, allowing relatively small signals to control large devices. also an interface between electronic controllers and pneumatic systems.

Hydraulic solenoid valves:

Hydraulic solenoid valves are generally similar to pneumatic solenoid valves except that they control the flow of hydraulic fluid (oil). Hydraulic machines use solenoids to control the flow of oil. Solenoids are often used in irrigation systems, where relatively weak solenoids open and close small pilot valves, which in turn activate the main valve by applying fluid pressure to the piston or diaphragm that is mechanically coupled to the main valve.

Solenoids are also in everyday household items such as washing machines to control the flow and amount of water into the machine. Solenoids control the transmission of fluid flow through an automatic transmission and are usually installed in the body of the transmission valve

Typical Solenoid Applications:

  • Linear Applications
  • Valve Actuators
  • Latching/Switching
  • Pushing/Pulling Objects
  • Sorting
  • Shutters
  • Fuel injector


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