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Dema Solenoid valves

When the solenoid coil is energized, the plunger is pulled up, thus opening the small "pilot port" in the center of the diaphragm plate. This releases the pressure on top of the diaphragm allowing incoming pressure to lift it off the larger center port. When the coil is de-energized, the solenoid plunger is pushed down by the kick-off spring and closes the pilot port. Fluid passes through the small diaphragm bleed hole until pressure is equalized on both sides of the diaphragm to shut off the larger port.

Title: How do the Dema Solenoid valves work?
Description: Operation of the Dema Solenoid valves
Published: 8/28/2009
Last Edited: 1/20/2023
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