Danfoss EVU, EVU 1, EVU 3, EVU 2, EVU 4 Data sheet

Data Sheet

Solenoid valves
Type EVU

Normally Closed (NC)

EVU solenoid valves are designed to t into
compact refrigeration systems. Available in
direct and servo operated versions, they can be
applied in liquid, suction, and hot gas lines with
uorinated refrigerants.

EVU solenoid valves can be used in many
dierent 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 benets:

◦ 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.

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7

8

9

6

1 2 3 4

5

10

Danfoss
32M17

1 2 3 4

5

13

12

11

10

7

8

9

6
A

Danfoss
32M16

1, 5

2, 43678910111213A

Solder connection

Solder ring

Valve housing

Union nut

Armature tube

Return spring

Armature

Support ring

Pilot plate (servo)

Seat plate (servo)

Piston (servo)

Servo chamber

Solenoid valves, Type EVU

Functions

Figure 1: Direct operated

Figure 2: Servo operated

Direct operated

EVU 1 is direct operated. The valve opens directly for full ow when the armature (9) moves up into the magnetic
eld of the coil.

This means that the valve can operate at 0 bar dierential 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 dierential pressure. The valve closes rather soft, because the pilot
system does not fully close before the main orice has closed. This minimizes liquid hammer.

When the coil is currentless, the main orice, seat plate (12) and pilot orice (on the pilot plate (11)) are closed. The
pilot orice and main orice are held closed by the armature spring force and the dierential pressure between inlet
and outlet sides.

When current is applied to the coil, the armature (9) is drawn up into the magnetic eld and thus lifts the pilot plate
(11) and opens for the pilot orice 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 orice opens for full ow.

Therefore a minimum dierential pressure of 0.02 bar is necessary to open the valve and keep it open.

When the current to the coil is switched o, 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 orice closes. The armature (9) continues its downwards movement until the pilot
orice on the pilot plate (11) is fully closed.

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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 specied refrigerants as working uid.

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 ammable refrigerant.

NOTE:



Please follow specic 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).

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