Danfoss EV225B Data sheet

Data Sheet

Solenoid valve
Type EV225B

Servo diaphragm operated for steam applications

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 dezincication
resistant brass and the valve seats are made of
stainless steel.

This ensures a long life even in when used with
highly aggressive steam.

Features and versions

• Specically designed for steam applications,
160 °C or 185 °C

• Clip on coil

• Ambient temperature: up to 40 °C

• Coil enclosure: up to IP65

• EV225B used with BQ coil:
AC voltage up to 185 °C

• EV225B used with BN coil:
DC voltage up to 160 °C

• EV225B used with BB coil:
AC voltage up to 160 °C
DC voltage up to 140 °C

• Connection: ISO 228/1

AI250386497491en-000701

Features

EV225B

Body material

DZR brass

DZR brass

DZR brass

DN [mm]

6-25

10-25

10-25

Connection

G1/4'' - G1''

G1/2''-G1''

G1/2''-G1''

Sealing material

PTFE

PTFE

PTFE

Function

NCNCNC

Kv [m3/h]

0.9 - 6.0

2.2 - 6.0

2.2 - 6.0

Dierential pressure range [bar]

0.2 - 10

0.2-10

0.2 - 5

Temperature range [°C]

0 - 185

0 - 185

0 - 160

Solenoid valve, type EV225B

1 Portfolio overview

Table 1: Portfolio overview

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1.2.3.

4.5.6.7.8.

EV225B 6 – EV225B 10

EV225B 15 – EV225B 25

Coil

Valve plate

Pilot orice

Armature spring

Equalizing orice

Diaphragm

Main orice

Closing spring

Solenoid valve, type EV225B

2 Functions

2.1 Function NC

Coil voltage disconnected (closed)

When the voltage is disconnected, the valve plate (2) is pressed down against the pilot orice (3) by the armature
spring (4). The pressure across the diaphragm (6) is built up via the equalizing orice (5). The diaphragm/piston
closes the main orice (7) as soon as the pressure across the diaphragm/piston 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 orice (3) is opened. As the pilot orice is larger than the equalizing
orice (5), the pressure across the diaphragm (6) drops and therefore it is lifted clear of the main orice (7). The valve

is now open for unimpeded ow and will be open for as long as the minimum dierential pressure across the valve
is maintained, and for as long as there is voltage to the coil.

Table 2: Function NC

© Danfoss | Climate Solutions | 2021.06 AI250386497491en-000701 | 3

Danfoss

32U1460

ON

OFF

24h

Danfoss

32U9100

Solenoid valve, type EV225B

3 Applications

It is recommended to use a lter in front of the valve. Recommended lter 50 mesh (297 microns).

Figure 1: Filter

In water applications, exercise the valves at least once every 24 hours, meaning change the state of the valve. The
valve exercise will minimize the risk of the valve sticking due to calcium carbonate, zinc or iron oxide build-up.

Figure 2: Exercise: Valve on/o

To minimize scaling, and corrosion attack it is recommended that the water passing the valve have the following
values:

• Hardness 6-18 °dH to avoid scaling (chalk / lime stone build up).

• Conductivity 50 – 800 µS/cm to avoid brass dezincication and corrosion.

• Above 25°C media temperature avoid stagnant water inside the valve to avoid dezincication and corrosion
attack.

© Danfoss | Climate Solutions | 2021.06 AI250386497491en-000701 | 4