Danfoss EV250B Data sheet

Data Sheet

Solenoid valve Type EV250B

Assisted lift operated 2/2-way valve program is use in closed circuits with low dierential pressure

EV250B with assisted lift can operate from zero and up to 10 bar dierential pressure.

This 2/2-way valve program is especially to use in closed circuits with low dierential pressure, but demanding moderate ow rates.

Valve body in dezincication resistant brass for ensuring a long life even in connection with aggressive steam media.

EV250B is compatible with the broad Danfoss coil program with enclosures from IP00 up to IP67. Medium temperatures up to 140 °C (low pressure steam).

Features and versions:

• For water, oil, compressed air and similar neutral media

• Clip on coil

• Ambient temperature: Up to 80 °C

• Coil enclosure: Up to IP67

• The valve can be used for rough vacuum

• Water hammer damped

AI236986441319en-001001

Features

EV250B

Body material

DZR Brass

DN [mm]

10 - 22

Connection

G⅜'' - G1''

Sealing material

EPDM, FKM

Function

NC, NO

Kv [m3/h]

2.5 - 7

Dierential pressure range [bar]

0 - 10

Temperature range [°C]

-30 - 140

Solenoid valve, type EV250B

1 Portfolio overview

Table 1: Portfolio overview

1

2

3

4

5

6

7

8

9

123456789

Coil

Armature

Closing spring

Valve plate

Pilot orice

Diaphragm

Main orice

Equalizing orice

Assisted lift

Solenoid valve, type EV250B

2 Functions

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.

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.

1

2

3

4

5

6

7

8

9

11

10

12

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 EV250B

ON

OFF

24h

Solenoid valve, type EV250B

3 Applications

It is recommemded 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

Media

EPDM

Water

FKM

Oil, air and water

Media temperature [°C]

EPDM

-30 °C - 120 °C at 0 - 10 bar

120 °C - 140 °C at 0 - 4 bar

FKM

0 - 100 °C, for water max 60 °C

Ambient temperature [°C]

Up to 80 °C

Kv value [m3/h]

DN10

2.5 m3/h

DN12

4 m3/h

DN18

6 m3/h NC / 4.9 m3/h NO

DN22

7 m3/h NC / 5.2 m3/h NO

Min. Opening dierential pressure [bar]

0 bar

Max. Opening dierential pressure [bar]

10 bar

Max. working pressure [bar]

10 bar

Max. test pressure [bar]

15 bar

Pressure

Pressure range can be extended to use in rough vacuum, typically up to 99% vacuum (10 mbar), depending on the application.

Tightness

Internally: Better than 0.4 mbar l/sec (25 ccm air per min.) Externally: Better than 1* 10-3 mbar l/sec (100% He)

Viscosity [cSt]

Max. 50 cSt

p[bar]

EV250B 18B NO

EV250B 22B NO

EV250B 10B NC/NO

EV250B 12B NC/NO

EV250B 22B NC

EV250B 18B NC

Solenoid valve, type EV250B

4 Product specication

4.1 Technical data

Table 2: Technical data

Capacity diagram

Example, water: EV250B 12 at dierential pressure of 3 bar: Approx. 7 m3/h

Figure 3: Capacity diagram

Connection

ISO228/1

Function

Coil type BB, BE, BR, BY 10W AC

BG 12W AC

BG 20W DC

BN 20W AC

Coil type

BB/BE/BR/BY

18W DC

(1)

[Bar]

G⅜ - G1

NC

0-10

0-6NO0-10

0-10

Main type

EV250B 10BD

EV250B 12BD

EV250B 18BD

EV250B 22BD

Time to open [ms]

(1)

100

150

Time to close [ms]

(1)

100

Components

Materials

Specications

Valve body

DZR Brass

CuZn36Pb2As/CZ 132

Cover

Brass

W.no. 2.0402

Armature/armature stop

Stainless steel

W. no. 1.4105 / AISI 430FR

Armature tube

Stainless steel

W. no. 1.4306 / AISI 304L

Springs

Stainless steel

W. no. 1.4310 / AISI 301

O-ring

EPDM or FKM

Valve plate

EPDM or FKM

Diaphragm

EPDM or FKM

Solenoid valve, type EV250B

Dierential pressure range

Table 3: Dierential pressure range

(1)

6 bar max. opening dierential pressure is measured at 6% undervoltage ( 22.6 V DC hot coil), 50 °C ambient and 90 °C media temperature.

Time to open/close

Table 4: Time to open/close

(1)

The times are indicative and apply to water. The exact times will depend on the pressure conditions.

Material

Table 5: Materials

Type

Weight gross,

valve body without coil

[kg]

L

[mm]B[mm]

B1 [mm] / Coil type

H

[mm]

H

1

[mm]

BB/BE/BR/BY

BG/BN

EV250B 10

0.6

58

52.346689112.5

EV250B 12

0.6

58

52.346689112.5

EV250B 18

0.8

90.558466892

18

EV250B 22

1.1

9058466896.3

22.3

90° MAX

Recommended 15°

Solenoid valve, type EV250B

4.2 Dimensions and Weights

Table 6: Dimensions and weight: DZR brass, NC and NO

Figure 4: Dimensions

4.3 Mounting

Figure 5: Mounting angle

Connection ISO228/1

Seal Material

Orice

Kv value

Function

[mm]

[m3/h]

NC

NO

G ⅜

EPDM

10

2.5

032U5250

032U5350

FKM

032U5251

032U5351

G ½

EPDM

12

4

032U5252

032U5352

FKM

032U5253

032U5353

G ¾

EPDM

18

6

032U5254

FKM

032U5255

EPDM

4.9

032U5354

FKM

032U5355

G 1

EPDM

22

7

032U5256

FKM

032U5257

EPDM

5.2

032U5356

FKM

032U5357

Coil

Type

Power consumption

Enclosure

Features

BB / BY, clip on

11 - 16W AC 14 - 16W DC

IP00 with spade connector

IP20 with protective cap,

IP67 with cable plug

BR, clip on

12 - 14 W AC

16 W DC

IP00 with spade connector

IP20 with protective cap,

IP67 with cable plug

Design for marine application

BE, clip on

11 - 17 W AC 15 - 16 W DC

IP67

With terminal box

BF, clip on

11 - 16 W AC 14 - 16 W DC

IP67

With 1 m cable

BG, clip on

11 - 16 W AC 16 - 20 W DC

IP67

With terminal box

BN, clip on

22 W AC 20 W DC

IP67

Hum free

With terminal box and 1 m ca-

ble

Solenoid valve, type EV250B

5 Ordering

5.1 Parts program

Table 7: DZR brass, valve body NC and NO

5.2 Accessories

Coils

Table 8: Below coils can be used with EV250B:

Cable plug size

Description

Code no.

DIN 18

Cable plug IP67

042N1256

Application

Voltage [V AC]

To use with coil

Ambient tempera‐

ture [°C]

Code number

External adjustable timing from 1 to 45 minutes with 1 to 15 seconds drain open. With manual override (test button). Electrical connection DIN 43650 A / EN 175 301-803-A

24 – 240

BB

-10 – 50

042N0185

Solenoid valve, type EV250B

Cable plug

Figure 6: Cable plug

Table 9: Cable plug

Universal electronic multi-timer, type ET20M

Figure 7: ET20M

Type

Actuator unit NC

Actuator unit NO

EPDM

FKM

EPDM

FKM

EV250B 10-12BD

032U5315

032U5271

032U5319

032U5320

EV250B 18-22BD

032U5317

032U5273

032U5321

032U5322

1

3

4

5

6 7 8

2

1

2 3 4

1

2

3

4

5

6 7

1. O-ring for coil

2. 4 x screws

3. Armature tube

4. O-ring

5. Cover NC actuator unit with:

6. Armature + spring

7. Assist spring

8. Diaphragm

1. O-ring NC actuator unit with:

2. Armature + spring

3. Assist spring

4. Diaphragm

1. O-ring for coil

2. 4 x screws Complete NO actuator unit with:

3. Armature tube

4. O-ring

5. Cover

6. Assist spring

7. Diaphragm

Solenoid valve, type EV250B

Spare parts

Table 10: Actuator units NC/NO DZR

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Danfoss EV250B Data sheet

Specifications and Main Features

Frequently Asked Questions

User Manual