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Normally Open (N.O.)- Normally open valves are open when at rest (unenergized).

The second type of classification is based on the resting state of the valve: Normally Closed (N.C.)- Normally closed valves are closed when at rest (unenergized). This allows for a larger orifice without a larger solenoid. Pilot Operated- Pilot operated valves use the pressure of the fluid to close and seal the orifice. These solenoid get pricey, so instead pilot operated solenoid valves are used. They are almost exclusively smaller valves, as larger direct acting valves would require a very large solenoid. The first is based on the acting mechanism: Direct Acting- Direct acting solenoid valves use the plunger to directly close the orifice (small opening).

There are several different classifications of solenoid valves, based on a few different parameters. This magnetic field is used to move the ferrous plunger, which directly or indirectly closes (or opens) the valve. The solenoid is a cylindrical coil of wire that, when energized, produces a magnetic field. The electrical part refers to the solenoid. They are sometimes called electromechanical valves. Solenoid valves are magnetically operated valves.