Danfoss EV221BW Data sheet

Data Sheet

Solenoid valve
Type EV221BW

Direct servo operated for drinking water

EV221BW 10, 14, 20 and 22 is a direct servo­operated 2/2-way solenoid valve. 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 intel valve

• Dosing machines

• Food processing

Features

• For drinking water

• Clip on coil

• Coil enclosure: Up to IP67

• Water hammer damped

• Body material in Eco Brass (lead free <0,1%)
and dizincication resistant

• New generation EPDM sealings
recommended for drinking water.

AI307038742363en-000302

Features

EV221BW

EV221BW

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]

1.5 - 6.0

1.5 - 6.0

Dierential pressure range [bar]

0.1 - 10

0.1 - 10

Temperature range [°C]

0 - 90

0 - 90

Solenoid valve, Type EV221BW

1 Portfolio overview

Table 1: Portfolio overview

© Danfoss | Climate Solutions | 2021.05 AI307038742363en-000302 | 2

12345678Armature spring

Armature

Valve plate

Equalizing orice

Main orice

Pilot orice

Diaphragm

Coil

Solenoid valve, Type EV221BW

2 Functions

2.1 Functions NC

Coil voltage disconnected (closed)

When the supply voltage to the coil (8) is disconnected, the valve plate (3) is pressed down against the pilot orice
(6) by the armature spring (1). The pressure across the diaphragm (7) is built up via the equalizing orice (4). The
diaphragm closes the main orice (5) 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, the pilot orice (6) is opened. As the pilot orice is larger than the equalizing
orice (4), the pressure across the diaphragm (7) drops and therefore it is lifted clear of the main orice (5). The valve

is now open 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 (closed)

When the voltage to the coil (8) is disconnected, the pilot orice (6) is open. As the pilot orice is larger than the
equalizing orice (4), the pressure across the diaphragm (7) drops and therefore it is lifted clear of the main orice
(5). 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 (open)

When voltage is applied to the coil, the valve plate (3) is pressed down against the pilot orice (6). The pressure
across the diaphragm (7) is built up via the equalizing orice (4). The diaphragm closes the main orice (5) 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 | 2021.05 AI307038742363en-000302 | 3

1
2

3
4

5

8

6
7

12345678Armature

Opening spring

Valve plate

Equalizing orice

Main orice

Pilot orice

Diaphragm

Coil

Solenoid valve, Type EV221BW

Figure 2: Function NO

© Danfoss | Climate Solutions | 2021.05 AI307038742363en-000302 | 4