As a basic electrical part, solenoid becomes common in our daily life. It is widely applied in hydraulic system, agriculture, cars and many other fields. In fact, there are a few confusing terms like solenoid coil, solenoid and solenoid valve. Generally, solenoid, solenoid coil can be used as fitting of solenoid valve. You may be confused of what solenoid it is? What are differences of solenoid, solenoid coil and solenoid valve?

Solenoid coil

Solenoid coil refers to a cylindrical coil of wire, when current through coil and magnetic field will be generated. There a special type of coil – air core coil, which is wound by self-bonded enameled wire and no skeleton required. Solenoid coil can’t do one functional motion individually, and need to work with other medium. In the engineering science, solenoid coil also means some transducers, which transfer energy into linear motion. Solenoid coil is an important part of solenoid valve. What’s more, solenoid coil also apply for controlling pneumatic control valve or hydraulic valve.


Solenoid is an actuator for switch or valve. When a current flows through a solenoid, an electromagnetic field is created. Solenoid is made up of solenoid coil and iron core. Solenoid coil create magnetic field, and iron core increase the magnetic force. In order to degauss the solenoid immediately, materials for solenoid adopt soft iron or silicon iron. As for the application, solenoid can be used as element for various types of valve like on-off valve, proportional valve, explosion-proof valve, etc. Common solenoid types include on-off solenoid, proportional solenoid and explosion-proof solenoid. Besides, according to the power system, there are AC solenoid and DC solenoid in our daily life.

Solenoid valve

Solenoids valve is the industrial equipment which controls by the electromagnetism. It is a fundamental element and used for controlling the Fluid automation. Solenoids valve is final controlling element to use to adjust the parameter of media like direction, flux, speed and others parameters. The solenoids valve can fulfill the control plan with different circuits, and the control accuracy and flexibility can be guaranteed. The solenoids valve has many types, different type of solenoid valve can play their role in different position. The most commonly used is the check valve, relief valve, directional control valve, speed control valve.

There is a closed cavity in the solenoids valve. Some through-holes located in the different location and each through-hole links to different pipes. In the middle of the cavity are the piston, and the electromagnets at the both sides. When which side solenoids valve be power on, the valve body will be attached to this side. We can turn on or off the oil outlets and therefore achieve controlling the movement of the valve. The oil supply hole is normally open. The hydraulic oil will enter into different drain lines, and then through the oil pressure to push the cylinder piston, then the cylinder piston pushes the piston rod, and the piston rod drives the mechanism. So the solenoids valve controls the mechanical motion through forcing the electromagnet current on and off.

The solenoids valve can divide into air valve, water valve, and fuel valve and so on.

In Conclusion

All in all, solenoid coil is the core of solenoid, and solenoid valve is drived by solenoid. All these components help to support the hydraulic system. Anyang KaiDi is a solenoid supplier with 70 years’ experience. We are aimed of supplying high-quality solenoids supported by advanced technology and production equipment. Our hot-sale products include on-off solenoid, proportional solenoid and explosion proof solenoid, displacement sensor. In addition to, KaiDi is also the regular supplier for Rexroth, Yuken and Vickers.