Data Sheet
Solenoid valve
Type EV224B
Servo operated valve for air with oil for high pressure applications
EV224B for compressed air, is a high pressure
indirect servo-operated 2/2-way solenoid valve
with working pressure up to 40 bar, medium
temperature up to 60 °C and available in NC
and NO versions.
Built-in pilot lter as standard, replaceable
equalizing orice, enclosures up to IP67
(depending on coil) ensure a reliable and
satisfactory function.
Features
• For compressed air and compressed air with
mineral oil
• Clip on coil
• Ambient temperature: Up to 60 °C
• Coil enclosure: Up to IP67
• Built in lter for protection of pilot system
AI260151589548en-001301
Features
EV224B
Body material
Brass
DN [mm]
15 - 25
Connection
G
1
⁄2'' - G1''
Sealing material
NBR
Function
NC, NO
Kv [m3/h]
4 - 11
Dierential pressure range [bar]
0.3 - 40
Temperature range [°C]
-10 - 60
Solenoid valve, Type EV224B
1 Portfolio overview
Table 1: Portfolio overview
© Danfoss | Climate Solutions | 2021.06 AI260151589548en-001301 | 2
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DANFOSS
32U846_11
1.2.3.4.5.6.7.
Coil
Armature spring
Valve plate
Pilot orice
Diaphragm
Main orice
Equalizing orice
Solenoid valve, Type EV224B
2 Functions
2.1 Function NC
Coil voltage disconnected (closed)
When the voltage is disconnected, the valve plate (3) is pressed down against the pilot orice (4) by the armature
spring (2). The pressure across the diaphragm (5) is built up via the equalizing orice (7). The diaphragm closes the
main orice (6) as soon as the pressure across the diaphragm is equivalent to the inlet pressure. The valve will be
closed for as long as the voltage to the coil is disconnected.
Coil voltage connected (open)
When voltage is applied to the coil (1), the pilot orice (4) is opened. As the pilot orice is larger than the equalizing
orice (7), the pressure across the diaphragm (5) drops and therefore it is lifted clear of the main orice (6). The valve
is now open for unimpeded ow and will be open for as long as the minimum dierential pressure across the valve
is maintained, and for as long as there is voltage to the coil.
Figure 1: Function NC
2.2 Function NO
Coil voltage disconnected (open)
When the voltage to the coil (2) is disconnected, the pilot orice (4) is open. As the pilot orice is larger than the
equalizing orice (7), the pressure across the diaphragm (5) drops and therefore it is lifted clear of the main orice
(6). The valve will be open for as long as the minimum dierential pressure across the valve is maintained, and for as
long as the voltage to the coil is disconnected.
Coil voltage connected (closed)
When voltage is applied to the coil, the valve plate (3) is pressed down against the pilot orice (4). The pressure
across the diaphragm (5) is built up via the equalizing orice (7). The diaphragm closes the main orice (6) as soon
as the pressure across the diaphragm is equivalent to the inlet pressure. The valve will be closed for as long as there
is voltage to the coil.
© Danfoss | Climate Solutions | 2021.06 AI260151589548en-001301 | 3
DANFOSS
32U956
7
1.2.3.4.5.6.7.
Coil
Armature spring
Valve plate
Pilot orice
Diaphragm
Main orice
Equalizing orice
Solenoid valve, Type EV224B
Figure 2: Function NO
© Danfoss | Climate Solutions | 2021.06 AI260151589548en-001301 | 4
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