Industrial solenoid valves

Efficiently controlling fluids

Danfoss offers an exceptionally wide range of high performance solenoid valves, available in direct-operated, servo-operated and assisted lift versions. An easy, economical way to control and regulate fluids and non-flamable gases. Danfoss solenoid valve bodies and electrical coils are normally supplied separately and then combined, but the valves are also available as complete units if required.

EV212B for Ballast water treatment applications

Leading ballast water tank systems manufacturer Techcross eliminates line blockages with Danfoss solenoid valves

More than 90 percent of global trade is transported by sea. As a ship's cargo is unloaded and loaded, ballast water is pumped in and out to maintain the vessel's stability – this equates to around 12 billion tons every year.

EV212B

Solenoid valves with FKM isolating diaphragm for aggressive media, suited for ballast water treatment systems.

How to comply with new Ballast water regulation

This article explores the challenge of ballast water and the solutions required to comply with the new regulation.

Test solenoid coils easily with Magnetic Tool

Ensuring that a solenoid valve coil is working properly, or detecting a faulty one, is an important step in many repair or installation projects.

Click to read more

We offer a general B valve series with a high capacity and the A series is more economic and compact. Danfoss solenoid valves are assembled quickly and simply without tools, providing optimum product flexibility and availability. A coil can be replaced if needed without stopping or draining the system.

Applications for solenoid valves

Our solenoid valve program includes valves for air, steam, oil, and gas, suiting a number of industrial applications that require high performance in these and other applications:

Laundry and dry-cleaning equipment
Industrial washing equipment
Autoclaves/sterilizers
Compressors and vacuum pumps
Plastic moulding machinery
Steam boilers
Food processing machinery
Sprinklers and fire fighting systems
Dentist equipment
Coffee machines
Boilers

New solenoid valves for drinking water

WRAS and RISE approved solenoid valves ensure your compliance. Danfoss solenoid valves are the clever choice for installers and the safe choice for drinking water.

Solenoid valves for drinking water

Drinking water solenoid valves - Danfoss

Features and benefits

Clip-on coil
Coil range up to IP67
Best water hammer damping
Long lifetime and high performance
Insensitive to dirt
Broad range and customized solutions

Protect your system with our approved solenoid valve program

- an easy way to control and regulate fluids.

Read brochure

Documents

Documents
Type	Name	Language	Valid for	Updated	Download	File type
Brochure	Fluid Controls overview	Finnish	Finland	21 Dec, 2023	631.5 KB	.pdf
Brochure	Fluid Controls overview	English	United States	22 Mar, 2022	410.8 KB	.pdf
Brochure	Fluid Controls overview	Portuguese	Brazil	22 Mar, 2022	502.1 KB	.pdf
Brochure	Fluid Controls overview	Polish	Poland	22 Mar, 2022	536.4 KB	.pdf
Brochure	Fluid Controls overview	Spanish, Castilian	Spain	22 Mar, 2022	509.6 KB	.pdf
Brochure	Fluid Controls overview	French	France	22 Mar, 2022	509.3 KB	.pdf
Brochure	Fluid Controls overview	Chinese	China	22 Mar, 2022	690.4 KB	.pdf
Brochure	Fluid Controls overview	Korean	South Korea	22 Mar, 2022	545.9 KB	.pdf
Brochure	Fluid Controls overview	Swedish	Sweden	14 Feb, 2024	2.6 MB	.pdf
Brochure	Fluid Controls overview	Italian	Italy	09 Oct, 2024	2.4 MB	.pdf
Brochure	Fluid Controls overview	German	Germany	22 Mar, 2022	539.9 KB	.pdf
Brochure	Fluid Controls overview	Danish	Denmark	21 Nov, 2024	1.1 MB	.pdf
Brochure	Fluid Controls Overview	Ukrainian	Ukraine	13 Sep, 2023	593.6 KB	.pdf
User guide	How to use solenoid valves	Danish	Multiple	10 Nov, 2015	1.7 MB	.pdf
User guide	How to use solenoid valves	Czech	Multiple	10 Nov, 2015	1.8 MB	.pdf
User guide	How to use solenoid valves	Polish	Multiple	29 Feb, 2016	3.1 MB	.pdf
User guide	How to use solenoid valves	Hungarian	Multiple	22 Jan, 2016	3.1 MB	.pdf
User guide	How to use solenoid valves	Russian	Multiple	10 Nov, 2015	1.8 MB	.pdf
User guide	How to use solenoid valves	Spanish, Castilian	Multiple	10 Nov, 2015	1.7 MB	.pdf
User guide	How to use solenoid valves	German	Multiple	10 Nov, 2015	1.8 MB	.pdf
User guide	How to use solenoid valves	English	Multiple	10 Nov, 2015	1.7 MB	.pdf
User guide	How to use solenoid valves	French	Multiple	10 Nov, 2015	1.8 MB	.pdf

Highlighted products

EV225B, servo-operated 2/2-way solenoid valves

EV225B is a servo-operated 2/2-way solenoid valve for use in steam applications. The design is based on a PTFE diaphragm concept, ensuring highly reliable function when used in connection with contaminated steam. Each valve body is made of dezincification resistant brass and the valve seats are made of stainless steel. This ensures a long life, even when used with highly aggressive steam.

EV250BW 10-22, assisted lift operated solenoid valves for drinking water

EV250BW 10-22 is an assisted lift operated 2/2-way solenoid valve. The valve body is made of ECO brass and uses next-generation EPDM sealings. The valve is a compact valve used for process water with low differential pressure, e.g. process inlet and drinking water applications where drinking water approvals as RISE, SINTEF, ACS, PZH and WRAS are required.

EV220BW 15-50, indirect servo-operated 2/2-way solenoid valve

The EV220BW is an indirect servo-operated 2/2-way solenoid valve designed for drinking water and it is available in NC or NO. Valve sealings are available in EPDM, and the valve body in ECO brass or stainless steel. Wetted materials in accordance with 4MSI, DVGW, KTW – W270, and the valve program has RISE, SINTEF, WRAS, ACS and PZH approvals as well for cold and hot water applications.

EV220S 10-50 solenoid valve

EV220S is a range of streamlined compact servo-operated 2/2-way solenoid valves with connections from 1/4" to 2", special designed to fit in applications where space is limited

EV221BW 10-22, direct operated 2/2-way solenoid valve

EV221BW 10-22 is a direct servo-operated 2/2-way solenoid valve. The valve body is made of ECO brass and uses next-generation EPDM sealings. The valve has a built-in pilot filter, which makes it the ideal choice for water inlet and drinking water applications where drinking water approvals as RISE, SINTEF, ACS or PZH are required.

Support

Looking for support?

Are you a wholesaler or installer? Visit the dedicated support portal to get easy access to all relevant tools and information from Industrial Automation.

Industrial Installer Hub

Quick Links

Need technical information? Get easy access to data sheets for our products as well as direct links to our product catalog here.

Quick Selector for solenoid valves, fluid controls

Find the most suitable solenoid valve and coil for your project from the Danfoss product portfolio.

Watch the video Visit the Quick Selector

FAQ

Troubleshooting solenoid valves – NC normally closed (armature tube is straight without dent)

Symptom: Solenoid valve does not open, no flow

Power should be on coil but valve is closed. Voltage on coil?

If no voltage on coil:

Check coil supply: Is supply activated?
If not – supply or fuse may be defect.

Power should be on coil but valve is closed. Voltage on coil?

If voltage on coil:

Use a magnetic detector.
Lift coil slightly and note whether it offers resistance against lifting.
Eventually use a permanent magnet.
NOTE: Never remove a coil with voltage applied for more than
2 seconds – it may burn out.

Power should be on coil but valve is closed. Correct coil / correct coil voltage?

Check to make sure the coil’s electrical requirements are the same as
the installation supply.

Diffential pressure too high for body or coil?

Check coil data. If necessary, replace coil with correct version.
Reduce differential pressure, e.g. by limiting inlet pressure.

Differential pressure too low for body?

Check valve body data and differential pressure. If necessary, replace
valve body with correct version.

Damaged / bent armature tube.

Replace valve.

Dirt / deposit blocking armature or diaphragm too stiff,

Clean orifice with needle or similar (max diameter 0.5 mm). Blow clean with compressed air. If necessary, replace defective component(s).

Dirt / deposit in pilot hole.

Clean pilot hole with a pin or needle.

Symptom: Solenoid valve partly opens, low flow

Differential pressure too low for body?

Check valve data, incl. differential pressure.
Replace valve with correct version.

Damaged or bent armature tube.

Replace valve.

Dirt at diaphragm / diaphragm damaged.

Clean diaphragm. If necessary, replace defective component(s).

Armature partly blocked / dirt or deposit in armature tube.

Clean valve. If necessary, replace defective component(s).

Symptom: Solenoid valve does not close/partly closes

Voltage remains on coil.

First lift coil slightly and note whether it offers resistance against lifting.
NOTE: Never remove a coil with voltage applied for more than
2 seconds – it may burn out

Dirt on main orifice, or on pilot orifice, or equalizing orifice in diaphragm, in armature tube or equalizing unit blocked.

Clean orifice with needle or similar (max diameter 0.5 mm).
Blow clean with compressed air.
If necessary, replace defective component(s).

Pulsation in pressure line. Differential pressure too high in open position. Pressure on outlet side periodically higher than pressure on inlet side.

Check valve data.
Check pressure and liquid flow.
Check rest of installation.
Replace valve with a more suitable alternative.

Damaged or bent armature tube

Replace valve.

Defective valve plate, diaphragm or valve seat. Dezincification, dirt, deposit or damage on main or pilot orifice.

Check pressure and liquid flow.
Replace defective component(s).

Diaphragm upside down.

Check correct installation of valve (see instruction/datasheet).

Symptom: Solenoid valve making noise

Hum (only on AC voltage 50/60 Hz)

Hum caused by AC frequency can be removed by changing to coil
with rectifier.
Inspect and clean inside armature and armature tube.
Can also be dirt or armature or spring worn out / defect (Replace valve or parts).

Water hammer when valve opens. Water hammer when valve closes

See installation guide.
Pipes very long and pipe diameter too small.

Differential pressure too high and / or pulsation in pressure line

Check valve data.
Check pressure and liquid flow.
Check for back pressure.
Check rest of installation.
Replace valve with a more suitable alternative.

Symptom: Coil burnt – melted; coil with voltage on

Incorrect voltage / frequency.

Check coil data. If necessary, change to correct coil type. Check wiring
diagram and wiring. Check maximum voltage variation:
Permissible voltage variation: +/- 10% for dual frequency;
DC and NO applications +10% / -15% for AC on single frequency
voltages.

Differential pressure too high.

Check coil data. If necessary, replace coil with correct version.
Reduce differential pressure, e.g. by limiting inlet pressure.

Coil short cut because of humidity, wrong coil IP rating, too high ambient temperature, too high media temp.

Check coil data and differential pressure and ambience temperatures
and media and check with coil and valve specifications.

Damaged / bent armature tube.

Replace valve.

Dirt at armature / armature tube / armature stuck.

Clean armature tube and armature. If necessary, replace defective
component(s).

Troubleshooting solenoid valves – NO normally open (armature tube is straight with dent)

Symptom: Solenoid valve does not open, no flow

Power should be on coil but valve is open. Voltage on coil?

If no voltage on coil:

Check coil supply: Is supply activated?
If not – supply or fuse may be defect.

Power should be on coil but valve is closed. Voltage on coil?

If voltage on coil:

Power should be on coil but valve is closed. Correct coil / correct coil voltage?

Check to make sure the coil’s electrical requirements are the same as
the installation supply.

Diffential pressure too high for body or coil?

Check coil data. If necessary, replace coil with correct version.
Reduce differential pressure, e.g. by limiting inlet pressure.

Differential pressure too low for body?

Check valve body data and differential pressure. If necessary, replace
valve body with correct version.

Damaged / bent armature tube

Replace valve.

Dirt / deposit blocking armature or diaphragm too stiff.

Clean orifice with needle or similar (max diameter 0.5 mm). Blow clean with compressed air. If necessary, replace defective component(s).

Dirt / deposit in pilot hole

Clean pilot hole with a pin or needle.

Symptom: Solenoid valve partly opens, low flow

Diffential pressure too low for body?

Check valve data, incl. differential pressure.
Replace valve with correct version.

Damaged or bent armature tube.

Replace valve.

Dirt at diaphragm / diaphragm damaged

Clean diaphragm. If necessary, replace defective component(s) .

Armature partly blocked / dirt or deposit in armature tube

Clean valve. If necessary, replace defective component(s).

Symptom: Solenoid valve does not close/partly closes

Voltage remains on coil

First lift coil slightly and note whether it offers resistance against lifting.
NOTE: Never remove a coil with voltage applied for more than
2 seconds – it may burn out.

Dirt on main orifice, or on pilot orifice, or equalizing orifice in diaphragm, in armature tube or equalizing unit blocked.

Clean orifice with needle or similar (max diameter 0.5 mm).
Blow clean with compressed air.
If necessary, replace defective component(s).

Pulsation in pressure line. Differential pressure too high in open position. Pressure on outlet side periodically higher than pressure on inlet side.

Check valve data.
Check pressure and liquid flow.
Check rest of installation.
Replace valve with a more suitable alternative

Damaged or bent armature tube

Replace valve.

Defective valve plate, diaphragm or valve seat. Dezincification, dirt, deposit or damage on main or pilot orifice

Check pressure and liquid flow.
Replace defective component(s)

Diaphragm upside down

Check correct installation of valve (see instruction/datasheet)

Symptom: Solenoid valve making noise

Hum (only on AC voltage 50/60 Hz)

Water hammer when valve opens. Water hammer when valve closes

See installation guide.
Pipes very long and pipe diameter too small.

Differential pressure too high and / or pulsation in pressure line

Check valve data.
Check pressure and liquid flow.
Check for back pressure.
Check rest of installation.
Replace valve with a more suitable alternative.

Symptom: Coil burnt – melted; coil with voltage on

Incorrect voltage / frequency.

Differential pressure too high.

Check coil data. If necessary, replace coil with correct version.
Reduce differential pressure, e.g. by limiting inlet pressure.

Coil short cut because of humidity, wrong coil IP rating, too high ambient temperature, too high media temp.

Check coil data and differential pressure and ambience temperatures
and media and check with coil and valve specifications.

Damaged / bent armature tube.

Replace valve.

Dirt at armature / armature tube / armature stuck.

Clean armature tube and armature. If necessary, replace defective
component(s).

Learning

Case stories

Leading ballast water tank systems manufacturer Techcross eliminates line blockages with Danfoss solenoid valves

Substantial savings on firefighting systems at Danfoss Semco

Pressure sensors from Danfoss Sensing Solutions help Danfoss Semco control water level in vital firefighting systems delivered to customers around the world. The innovative use of MBS 9200 provides substantial savings in assembly costs.

Articles

How to comply with regulations for exhaust gas

Increased focus on the environmental impact from the Marine industry drives new exhaust gas emission restrictions and regulation. The new regulation forces vessel owners and shipbuilders to implement new technical solutions to ensure compliance with local, regional and global legislation.

How to comply with new Ballast water regulation

This article explores the challenge of ballast water and the solutions required to comply with the new regulation.