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I wish I knew how a solenoid valve works and how to apply it in a control valve!
These simple devices can show up in areas outside industrial applications. For instance, if you listen to your dishwasher, then you might hear its solenoid valve opening and closing in the wash process.
A solenoid valve converts an electromagnetic signal into a mechanical movement. You have a coil of wire that has an iron plunger in the middle. This iron plunger will have a short movement range into the coil.
When you send energy to the coil, the magnetic field created will force the plunger to move to the middle of the coil. When the energy subsides, the plunger moves back to its natural position.
You can apply a solenoid in a control valve system in two ways. If you have a valve that works only in on/off conditions, then you can have a three-way solenoid valve to apply and release pressure to the actuator when necessary.
The second application is for safety. A three-way solenoid valve installed between the positioner and the valve actuator can control the valve if a failure happens, either keeping it in one position or moving it faster.