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.
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
G'' - 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
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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.
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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
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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
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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
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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]
[Bar]
G - 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
100
150
150
Time to close [ms]
(1)
100
100
100
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)
(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.
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)
(1)
The times are indicative and apply to water. The exact times will depend on the pressure conditions.
The times are indicative and apply to water. The exact times will depend on the pressure conditions.
Material
Table 5: Materials
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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
90° MAX
90° MAX
90° MAX
Recommended 15°
Recommended 15°
Recommended 15°
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
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Connection ISO228/1
Seal Material
Orice
Kv value
Function
[mm]
[m3/h]
NC
NO
G
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:
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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
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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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