Solenoids are very commonly used actuators in many process automation systems. There are many types of solenoid, for instance, there are solenoid valves which can be used to open or close water or gas pipelines and there are solenoid plungers which are used to produce linear motion. One very common application of solenoid that most of us would have come across is the ding-dong doorbell. The Door bell has a plunger-type solenoid coil inside it, which when energized by AC power source will move a small rod up and down. This rod will hit the metal plates placed on either side of the solenoid to produce the soothing ding dong sound. It is also used as starters in vehicles or as a valve in RO and sprinkler systems.
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