Solenoid actuator is one that uses an electromagnetic actuator to move a hydraulic control element, such as a funnel or spool.
Solenoid actuator is used wherever the fluid flow must be controlled automatically. Solenoid actuators are used more and more in the most diverse types of installations and devices. The variety of different types of solenoid actuators makes it possible to select a valve for a specific application.
Solenoid actuator is a control unit that, when powered or not powered, cuts or allows fluid to flow. Solenoid actuator is in the form of an electromagnet. After excitation, a magnetic field is created that pulls the piston or deflected armature against the action of the spring. After disconnection from the voltage, the piston or deflected fittings return to the original position by the action of the spring.
Solenoid actuator is built of components such as:
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Coil Winding
The coil winding is the solenoid actuator which creates an electromagnetic field when the current is applied across the terminals. It is typically made from copper which is the most cost-effective and efficient conductor of electricity.
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Yoke
The yoke also referred to as the shell or frame, concentrates the magnetic field. It surrounds the outside of the solenoid actuator coil and is typically made from low carbon steel. Steel or iron is a Ferromagnetic material. The flux created by the solenoid can flow easily through this Ferromagnetic material. The ferromagnetic material can also intensify the magnetic field. If the yoke did not exist, the flux lines or magnetic field would be loosely spaced, and the solenoid actuator would be inefficient.
There are few types of solenoid actuator like:
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Direct-acting solenoid actuator
In the event of direct operation of the solenoid actuator, the seat seal is attached to the core of the solenoid actuator. In the unpowered state, the socket opening is closed, which opens when the valve is energized.
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Direct-acting 2-way solenoid actuator
Two-way solenoid actuators with actuator are shut-off valves with one inlet and one outlet. In the non-powered state, the core spring, assisted by fluid pressure, maintains the valve seal on the valve seat to shut off the flow. When the power is turned on, the core and gasket are pulled into the solenoid actuator coil and the valve opens. The electromagnetic force is greater than the combined spring force and the static and dynamic pressure forces of the medium.
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Internally piloted solenoid valve
In the case of direct-acting valves, the static pressure forces increase as the bore diameter increases, which means that the magnetic forces required to overcome the pressure forces become correspondingly greater.
