Danfoss EV220BW, EV228BW Data sheet

Data Sheet

Solenoid valve
Type EV220BW and EV228BW

Indirect servo operated valves for drinking water

Solenoid valve range with drinking water
approvals

• For water supply

• Houses and large apartments
◦ Kitchen and bathrooms

• Commercial buildings

• Industrial buildings

• Zoning

• Laundry

• Diswashing

• Main inlet valves

• Machines and food processing

Features

• Clip-on coil

• Ambient temperature: Up to 70 °C

• Coil enclosure: Up to IP67

• Water hammer damped

• Built-in lter

• Body material in Eco brass (Lead free < 0,1 %)

or Stainless steel

• New generation EPDM sealings

recommended for drinking water

AI266333732850en-000501

Features

EV220BW

EV220BW

EV228BW

EV228BW

Body material

Eco brass

Stainless steel

Eco brass

Stainless steel

DN [mm]

15-25

15-50

15-25

15-50

Connection

G1/2'' - G1''

G1/2'' - G2''

G1/2'' - G1''

G1/2'' - G2''

Sealing material

EPDM

EPDM

EPDM

EPDM

Function

NC/NO

NC/NOUNUN

Kv [m3/h]

4-11

4-40

4-11

4-40

Dierential pressure range [bar]

0.3-10

0.3-10

0.3-10

0.3-10

Temperature range [°C]

0-90

0-90

0-70

0-70

Solenoid valve, Types EV220BW and EV228BW

1 Portfolio overview

Table 1: Portfolio overview

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1.2.3.4.5.6.7.

Coil

Armature spring

Valve plate

Pilot orice

Diaphragm

Main orice

Equalizing orice

Solenoid valve, Types EV220BW and EV228BW

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 orice (4) by the armature
spring (2). The pressure across the diaphragm (5) is built up via the equalizing orice (7). The diaphragm closes the
main orice (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 orice (4) is opened. As the pilot orice is larger than the equalizing
orice (7), the pressure across the diaphragm (5) drops and therefore it is lifted clear of the main orice (6). 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.

Figure 1: Function, NC

2.2 Function, NO

Coil voltage disconnected (open)

When the voltage to the coil (1) is disconnected, the pilot orice (4) is open. As the pilot orice is larger than the
equalizing orice (7), the pressure across the diaphragm (5) drops and therefore it is lifted clear of the main orice
(6). The valve will be open for as long as the minimum dierential 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 orice (4). The pressure
across the diaphragm (5) is built up via the equalizing orice (7). The diaphragm closes the main orice (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.

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1.2.3.4.5.6.7.

Coil

Armature

Valve plate

Pilot orice

Diaphragm

Main orice

Equalizing orice

+

+

Solenoid valve, Types EV220BW and EV228BW

Figure 2: Function, NO

2.3 Function UN, latching

Figure 3: Open

When (minus) is supplied to the left terminal pin and (plus) to the right (see gure 3), the pilot orice (4) is opened.
As the pilot orice is larger than the equalizing orice (7), the pressure across the diaphragm (5) drops and therefore
it is lifted clear of the main orice (6). The valve is now open for ow and will stay open as long as the minimum
dierential pressure across the valve is maintained, until the poles are switched back (see Figure 4: closed)

Figure 4: closed

Switching poles

When (plus) is supplied to the left terminal pin and (minus) to the right (see gure 4), the valve plate is pressed
down against the pilot orice (4) by the armature spring (2). The pressure across the diaphragm (5) is built up via the
equalizing orice (7). The diaphragm closes the main orice (6) as soon as the pressure across the diaphragm is
equivalent to the inlet pressure. The valve will stay closed, until the poles are switched (see Figure 3: Open)

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1.2.3.4.5.6.7.8.Coil

Armature spring

Valve plate

Pilot orice

Diaphragm

Main orice

Equalizing orice

Permanent magnet

Solenoid valve, Types EV220BW and EV228BW

Figure 5: Function UN, latching

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