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Dema Engineering Normally Closed Solenoid Valves are generally used for
water control up to 150 PSI. Used on many chemical systems such as Car
Wash Tunnel applications. A normally closed solenoid valve will open when
a current goes to the coil. When energized the plunger is pulled up to
the top plug opening the small pilot port in the center of the diaphragm
plate. This releases the water pressure on the top of the diaphragm
allowing incoming pressure to lift it off this large center port.
When de-energized, the solenoid plunger is pushed from the top plug by
the kick off spring and closes the pilot port. Fluid passes through the
diaphragm bleed hole until pressure is equalized on both sides of the
diaphragm to shut off the large port. All Normally Closed Diaphragm Valves have stainless steel seats.