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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.

Parts and Accessories
Coil Options

Normally Open High Pressure Valves

DEMA’s offers 2 high pressure valves, the 0453P and O453S. Both are designed for pressures from 10 psi up to 1000 psi, have brass bodies, Teflon seals, designed for 3/8” pipes and have 11/32” orifices. The only difference is the 0453S features a stainless steel piston. The high pressure valves operate the same as a pilot operated valve except the pilot port is in a separate chamber from the piston. This allows the plunger to operate closer to the top plug with more force and consequently higher opening pressure.

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Coil Options

Normally Open Mini Diaphragm Solenoid Valves

DEMA’s mini diaphragm solenoid valves are ideal for weep systems. They are available for 1/4, 3/8 and 1/2” pipes, have orifices from 1/4 or 3/8” and are constructed of brass, Celcon, polypropylene or stainless steel. 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.

Parts and Accessories
Coil Options
Features & Benefits
Models
Accessories
Resources
  • Application: Water, air, light oil, non-corrosive and nonexplosive liquids
  • Brass, Celon, Polypropylene, Stainless Steel body options
  • EPDM seals standard, Viton available on request
  • 442 and 443 series rated for 180°F/82°C fluid and 120°F/49°C ambient.
Model No. Pressure Differential Body Material Pipe Size N.P.T CV Flow Factor # GPM @ 60 psi (cv # x √ psi)
min/psi max/psi
O442P 3 125 Brass 1/4″ 1 7.75
O443P 3 125 Brass 3/8″ 1 7.75
OP442 3 125 Celcon 1/4″ 1 7.75
OP443 3 125 Celcon 3/8″ 1 7.75
OPP442 3 125 PolyPro 1/4″ 1 7.75
OPP443 3 125 PolyPro 3/8″ 1 7.75
O463PS 3 150 Stainless Steel 3/8″ 2 15.49
O464PS 3 150 Stainless Steel 1/2″ 2 15.49

* 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.
Product
Normally Open Mini Diaphragm Solenoid Valves
Model No.
O463PS-O464PS
Resource No. / Description
Product
Normally Open Mini Diaphragm Solenoid Valves
Model No.
OP442P-OP443 & OPP442-OPP443
Resource No. / Description
Product
Normally Open Mini Diaphragm Solenoid Valves
Model No.
OP462-OP463
Resource No. / Description
Product
Normally Open Mini Diaphragm Solenoid Valves
Model No.
O442P-O443P
Resource No. / Description
Product
Normally Open Solenoid Valves
Model No.
All
Resource No. / Description
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