Danfoss EVU, EVU 1, EVU 3, EVU 2, EVU 4 Data sheet
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Data Sheet
Solenoid valves
Type EVU
Normally Closed (NC)
EVU solenoid valves are designed to fit into compact refrigeration systems. Available in direct and servo operated versions, they can be applied in liquid, suction, and hot gas lines with fluorinated refrigerants.
EVU solenoid valves can be used in many different refrigeration systems and are specially designed for:
• Commercial refrigeration systems
• Refrigeration appliances
• Liquid coolers
• Ice cube machines
• Mobile refrigeration systems
• Heat pump systems
• Air conditioning units
EVU valves are available in straightway or angleway design. All valves are semi hermetically sealed and are not serviceable. The standard coil is available with 3-core cable connection and DIN plug.
EVU valve bodies and coils are ordered separately.
AI263435875820en-000501
Solenoid valves, Type EVU
Features
•Compact construction with small dimensions, low weight for both valve and coil.
•Semi-hermetic construction. Metallic sealing between armature tube and valve body. Bimetal connections to the brass housing benefits:
◦High strength of joints and high vibration resistance
◦Maximum external tightness within the whole temperature and pressure operation range
•Bimetal connections simple, fast soldering without the need of wet cloth or refrigration pliers.
•Direct and servo operated mini piston compact solenoid valve.
•Universal application for
◦Liquid, Suction, and Hot gas applications
◦Reduced power consumption
•Simple and fast mounting of coil, Clip clip - ON / OFF.
•Small encapsulated coils with long life time under extreme conditions.
•Large MOPD range - up to 36 bar.
© Danfoss | Climate Solutions | 2021.02 |
AI263435875820en-000501 | 2 |
Solenoid valves, Type EVU
Functions
Figure 1: Direct operated
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Danfoss |
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32M17 |
7 |
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8 |
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9 |
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10 |
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6 |
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1 |
2 |
3 |
4 |
5 |
Figure 2: Servo operated
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Danfoss |
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32M16 |
7 |
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10 |
8 |
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9 |
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11 |
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12 |
6 |
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A |
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13 |
1 |
2 |
3 |
4 |
5 |
1, 5 |
Solder connection |
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9 |
Armature |
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2, 4 |
Solder ring |
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10 |
Support ring |
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3 |
Valve housing |
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11 |
Pilot plate (servo) |
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6 |
Union nut |
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12 |
Seat plate (servo) |
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7 |
Armature tube |
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13 |
Piston (servo) |
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8 |
Return spring |
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A |
Servo chamber |
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Direct operated
EVU 1 is direct operated. The valve opens directly for full flow when the armature (9) moves up into the magnetic field of the coil.
This means that the valve can operate at 0 bar differential pressure. Thus, inlet pressure and spring force act to close the valve when the coil is currentless.
Servo operated
EVU 2 to 8 are servo operated piston solenoid valves. The servo piston principle results in a fast operating and compact valve that is able to open against a high differential pressure. The valve closes rather soft, because the pilot system does not fully close before the main orifice has closed. This minimizes liquid hammer.
When the coil is currentless, the main orifice, seat plate (12) and pilot orifice (on the pilot plate (11)) are closed. The pilot orifice and main orifice are held closed by the armature spring force and the differential pressure between inlet and outlet sides.
When current is applied to the coil, the armature (9) is drawn up into the magnetic field and thus lifts the pilot plate (11) and opens for the pilot orifice so that the de-energising of the servo chamber (A) starts and the pressure is relieved to the level of the outlet side. As the inlet pressure that acts on the bottom of the piston (13) now is higher than the pressure in the servo chamber (A), the piston is moved upwards and lifts both the pilot plate (11) and the seat plate (12). When the seat plate is lifted, the main orifice opens for full flow.
Therefore a minimum differential pressure of 0.02 bar is necessary to open the valve and keep it open.
When the current to the coil is switched off, the spring (8) forces the armature (9) down towards the pilot plate (11). The pressure in the servo chamber (A) increases and the piston will no longer be able to hold the seat plate (12) in lifted position, by which the main orifice closes. The armature (9) continues its downwards movement until the pilot orifice on the pilot plate (11) is fully closed.
© Danfoss | Climate Solutions | 2021.02 |
AI263435875820en-000501 | 3 |
Solenoid valves, Type EVU
Media
Refrigerants
R1233zd(E), R1234yf, R1234ze(E), R1270, R134a, R22/R407C, R23, R290, R32, R404A/R507A, R407A, R407F, R407H, R410A, R422B, R422D, R438A, R444B, R448A, R449A, R449B, R450A, R452A, R452B, R454A, R454B, R454C, R455A, R463A, R513A, R513B, R515A, R515B, R516A, R600, R600a, R744
For a complete list of approved refrigerants, visit store.danfoss.com and search for individual code numbers, where refrigerants are listed as part of technical data.
NOTE:
Special note for R1233zd(E), R1234yf, R1234ze(E), R1270, R152A, R290, R32, R444B, R452B, R454A, R454B, R454C, R455A, R516A, R600 and R600a: This product is validated in accordance to ATEX, ISO 5149, IEC 60335-2-24, IEC 60335-2-40 and UL. Ignition risk is evaluated in accordance to ISO 5149 and IEC 60335.
The EVU can be applied on systems with the above specified refrigerants as working fluid.
For countries where safety standards are not an indispensable part of the safety system Danfoss recommends the installer gets a third party approval of any system containing flammable refrigerant.
NOTE:
Please follow specific selection criteria stated in the datasheet for these particular refrigerants.
Temperature of medium
-40 – 105 °C max. 130 °C during defrosting
Ambient temperature
-40 – 50 °C
MOPD operating range
0.02 bar up to 36 bar
Humidity
0 − 100% R.H. (0-97% R.H. non-condensation condition if IP level is below IPX5).
© Danfoss | Climate Solutions | 2021.02 |
AI263435875820en-000501 | 4 |
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