Normally closed solenoid valves open when the electrical coil is energized. They are ideal for water, air, light oil, noncorrosive and non-explosive liquids. DEMA offers a number of different closed solenoid valves including mini diaphragm, diaphragm, high pressure, pilot-piston, direct acting manifolds and direct acting for special purposes and corrosive liquids. DEMA solenoid valves are constructed to insure long, trouble free life. They employ proven design features for reliable performance on all applications.
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Mini Diaphragm Solenoid ValvesMini diaphragm solenoid valves are available for 1/4-1/2” pipes, have orifices from 1/4-3/8” and are constructed of brass, Celcon, polypropylene or stainless steel. When 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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Diaphragm Solenoid ValvesDiaphragm solenoid valves are available for 3/8-3/4” pipes, have orifices from 9/16-3/4” are constructed of brass or stainless steel and have stainless steel seats. When 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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High Pressure ValvesDEMA’s high pressure valves are designed for pressures from 10 psi up to 1200 psi, are available for 3/8-1” pipes, have orifices from 11/32-15/16” and are intended for use with water only. They 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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Direct Acting ValvesDEMA’s direct acting valves are available for 1/8-1/4” pipes, have orifices of 7/64, 1/8 or 3/32”, have brass or stainless steel bodies and Buna N, Viton or EPDM seals. With direct acting valves, the stem and plunger assembly opens the port of the valve directly and requires no minimum pressure to operate.
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Pilot-Piston Solenoid ValvesDEMA’s pilot-piston valves are available for 3/8-1” pipes, have multiple orifice sizes from 9/32 to 3/4”, have brass bodies, stainless steel seats and Teflon seals. With pilot-piston valves, the stem and plunger assembly opens the port. This releases the pressure on top of the piston, which moves upward and opens the main valve port.
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Manifold Solenoid ValvesDEMA’s direct acting manifold valves are available in single and from 2-5 station manifolds, designed for 1/8-1/4” pipes, have 1/8” orifices , stainless steel bodies and Buna N, Viton or EPDM seals. Manifolds are made from solid brass or stainless steel block and have a common inlet port for chemical supply to all valves on both ends. With direct acting valves, the stem and plunger assembly opens the port of the valve directly and requires no minimum pressure to operate.
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Special Purpose ValvesDEMA’s special purpose valves are “manifolding” diaphragm valves constructed of 30% glass filled polypropylene or glass filled nylon that can be joined together to form a manifold without bushings or connectors. The P404J is made from glass filled polypropylene, has an EPDM seal, is rated up to 125 psi, and has 1/2” pipe and 3/8” orifice size. The 466P is made from glass filled nylon, has a Viton seal, is rated up to 150 psi, and has 3/4” pipe and orifice size.
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Direct Acting Corrosive Liquid Solenoid ValvesDEMA’s direct acting valves for corrosive liquids are constructed from PVC, EPDM seal, have a 5/32” orifice size and a CV flow factor of .27. DEMA offers 3 different models. The 481P direct acting diaphragm valve designed for vacuum lines with corrosive liquids. It is designed for 1/8” pipe but can also be injector mounted by using Kit 24-50. The 481-2 is designed to be injector mounted and has dual inlets. It can be mounted on all DEMA B and C series injectors. The 482-2 is also a direct acting diaphragm used on vacuum lines with corrosive liquids but is adjustable and designed for 1/4” pipe.
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Coil Options & Electrical SpecificationsFor ease of identification, coils are manufactured with the following Color Coding
Leads on valves with a conduit boss and flying lead coils are 18” long while coil leads on valves with a junction box are 6” in length. Coil to Valve Usage (Most available in AC or DC)
Electrical Specification For AC Coils
Electrical Specification For DC Coils
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Valve Repair Kits
*Note: Add Suffix (B) Buna, (E) EPDM, (V) Viton i.e. 49-1-8V |
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