Danfoss EV225B Data sheet

Data Sheet

Solenoid valve

Type EV225B

Servo diaphragm operated for steam applications

EV225B is a servo-operated 2/2-way solenoid valve for use in steam applications.

The design is based on a PTFE diaphragm concept, ensuring highly reliable function when used in connection with contaminated steam.

Each valve body is made of dezinci€cation resistant brass and the valve seats are made of stainless steel.

This ensures a long life even in when used with highly aggressive steam.

Features and versions

• Speci€cally designed for steam applications, 160 °C or 185 °C

• Clip on coil

• Ambient temperature: up to 40 °C

• Coil enclosure: up to IP65

• EV225B used with BQ coil: AC voltage up to 185 °C

• EV225B used with BN coil: DC voltage up to 160 °C

• EV225B used with BB coil: AC voltage up to 160 °C DC voltage up to 140 °C

• Connection: ISO 228/1

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Solenoid valve, type EV225B

1 Portfolio overview

Table 1: Portfolio overview

Features				EV225B

Body material			DZR brass	DZR brass	DZR brass

DN [mm]			6-25	10-25	10-25

Connection			G1/4'' - G1''	G1/2''-G1''	G1/2''-G1''

Sealing material			PTFE	PTFE	PTFE

Function			NC	NC	NC

K	v	[m3/h]	0.9 - 6.0	2.2 - 6.0	2.2 - 6.0
	v
Di€erential pressure range [bar]			0.2 - 10	0.2-10	0.2 - 5

Temperature range [°C]			0 - 185	0 - 185	0 - 160

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Solenoid valve, type EV225B

2 Functions

2.1 Function NC

Coil voltage disconnected (closed)

When the voltage is disconnected, the valve plate (2) is pressed down against the pilot ori€ce (3) by the armature spring (4). The pressure across the diaphragm (6) is built up via the equalizing ori€ce (5). The diaphragm/piston closes the main ori€ce (7) as soon as the pressure across the diaphragm/piston 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 (3) is opened. As the pilot ori€ce is larger than the equalizing ori€ce (5), the pressure across the diaphragm (6) drops and therefore it is lifted clear of the main ori€ce (7). The valve is now open for unimpeded flow and will be open for as long as the minimum differential pressure across the valve is maintained, and for as long as there is voltage to the coil.

Table 2: Function NC

EV225B 6 – EV225B 10

EV225B 15 – EV225B 25

1.Coil

2.Valve plate

3.Pilot ori€ce

4.Armature spring

5.Equalizing ori€ce

6.Diaphragm

7.Main ori€ce

8.Closing spring

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Solenoid valve, type EV225B

3 Applications

It is recommended to use a €lter in front of the valve. Recommended €lter 50 mesh (297 microns).

Figure 1: Filter

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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/off

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OFF

24h

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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