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Dema Solenoid Valves are constructed to insure long, trouble-free life. They employ proven design features for reliable performance on all applications. There are two basic types of solenoid valves, Normally Closed (N.C.) and Normally Open (N.O.). Normally Closed valves open when the coil is energized and close when the coil is de-energized. Normally Open valves close when the coil is energized and open when the coil is de-energized. Normally Closed valves are the most commonly used in water treatment. Valves are rated for 200°F. fluid and 120° ambient. These valves may be mounted horizontal, on their side or in a vertical line. Standard voltage is 120 volts, 24 volts is also available.