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Normally Open Diaphragm Solenoid Valves

Diaphragm solenoid valves are available for 3/8, 1/2 and 3/4” pipes, have orifices from 9/16-3/4” are constructed of brass, have Buna N seals and stainless steel seats. When not energized, the plunger is pulled to the top plug, 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 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.

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  • Application: water, air, light oil, noncorrosive and non-explosive liquids.
  • Brass construction and stainless steel seats
  • Buna N diaphragms
  • Rated for 200°F/93°C fluid and 120°F/49°C ambient.
  • CV flow factor 3.5 (O473P), 4.0 (O474P) and 5.0 (O476P)
Model No. Pressure Differential Body Material Pipe Size N.P.T CV Flow Factor # GPM @ 60 psi (cv # x √ psi)
min/psi max/psi
O473P 1 150 Brass 3/8″ 5 38.73
O474P 1 150 Brass 1/2″ 5 38.73
O476P 1 150 Brass 3/4″ 5 38.75

* Shown above are the most common configurations.  Many additional configurations are readily available, contact us at [email protected] or speak with your DEMA sales representative for more information.

Coil Options

Coil Options

    • DEMA solenoid valves are available in many AC and DC voltage ratings and wiring options include a junction box, spade, conduit and din with voltage options of 12VDC, 24VDC, and 24, 120, 208, and 240VAC 50/60 cycle on most models.
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Normally Open Diaphragm Solenoid Valves
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Normally Open Solenoid Valves
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