Danfoss EV250BW Data sheet

Data Sheet

Solenoid valve
Type EV250BW

Servo operated with assist to open from 0 to 10 bar
for drinking water applications

EV250BW 10,12,18 & 22 with assisted lift can
operate from 0-10 bar dierential pressure. This
2/2-way valve program is especially to use in
applications with low dierential pressure, but
demanding moderate ow rates.

This valve type is designed with EPDM seal,
lead free dezincication resistant Eco brass for
drinking water applications.

• For water supply

• Houses and large apartments

• Kitchens and bathrooms

• Commercial buildings

• Industrial buildings

• Zoning

• Laundry

• Dishwashing

• Main inlet valves

• Machine and food processing

Features

• Designed for drinking water

• Clip on coil

• Ambient temperature: Up to 50 °C

• Coil enclosure: Up to IP67

• Water hammer damped

• Body material in Eco brass (lead free < 0,1%)
and dezincication resistance.

• New generation EPDM sealings
recommended for drinking water

AI315946479533en-000201

Features

EV250BW NC

EV250BW NO

Body material

Eco brass

Eco brass

DN [mm]

10 - 22

10 - 22

Connection

G3/8'' - G1''

G3/8'' - G1''

Sealing material

EPDM

EPDM

Function

NC

NO

Kv [m3/h]

2.5 - 7

2.5 - 5.2

Dierential pressure range [bar]

0 - 10

0 - 10

Temperature range [°C]

0 - 90

0 - 90

Solenoid valve, Type EV250BW

1 Portfolio overview

© Danfoss | Climate Solutions | 2021.06 AI315946479533en-000201 | 2

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Coil

Armature

Closing spring

Valve plate

Pilot orice

Diaphragm

Main orice

Equalizing orice

Assisted lift

Solenoid valve, Type EV250BW

2 Function

2.1 Function NC

Coil voltage disconnected (closed)

When the supply voltage to the coil (1) is disconnected, the valve plate (4) is pressed down against the pilot orice
(5) by the closing spring (3). The pressure across the diaphragm (6) is built up via the equalizing orice (8). The
diaphragm closes the main orice (7) as soon as the pressure across the diaphragm is equivalent to the inlet
pressure below, due to the larger diameter of the upper side and/or the tension of the closing spring (3). The valve
will be closed as long as the voltage to the coil is disconnected.

Coil voltage connected (open)

When voltage is applied to the coil, the armature (2) and the valve plate (4) are lifted clear of the pilot orice (5). If
there is a dierential pressure across the valve, the pressure above the diaphragm (6) drops as the pilot orice is
larger than the equalizing orice. Therefore the diaphragm is lifted clear of the main orice (7). If there is no
dierential pressure across the valve, the armature (2) draws the diaphragm (6) clear of the main orice (7) using the
assisted lift (9). The valve will be open for as long as there is voltage to the coil.

Figure 1: Function NC

2.2 Function, NO

Coil voltage disconnected (valve is open)

When the supply voltage to the coil (1) is disconnected, the valve plate (7) are lifted clear of the pilot orice (9) if
there is a dierential pressure across the valve. The pressure above the diaphragm (10) drops as the pilot orice is
larger than the equalizing orice. Therefor the diaphragm is lifted clear of the main orice (12). If there is no
dierential pressure across the valve, the opening spring (5) draws the diaphragm (10) clear of the main orice (12)
using the assisted lift (8). The valve will be open for as long as there is no voltage to the coil.

Coil voltage connected (valve is closed)

When the supply voltage to the coil (1) is connected, the armature (3) will compress the opening spring (5) and the
closing spring will push the spindle (4)/ valve plate down against the pilot orice (9). The pressure across the
diaphragm (10) is built up via the equalising orice (11). The diaphragm closes the main orice (12) as soon as the
pressure across the diaphragm is equivalent to the inlet pressure below, due to the larger diameter of the upper side
and / or the tension of the closing spring (2). The valve will be closed as long as coil voltage is connected

© Danfoss | Climate Solutions | 2021.06 AI315946479533en-000201 | 3

123456789101112Coil

Closing spring

Armature

Spindle

Opening spring

Armature stop

Valve plate

Assisted lift

Pilot orice

Diaphragm

Equalising orice

Main orice

Solenoid valve, Type EV250BW

Figure 2: Function, NO

© Danfoss | Climate Solutions | 2021.06 AI315946479533en-000201 | 4