EVT 1.2 is direct operated. This means that the valve can operate at 0bar dierential pressure.
Coil voltage disconnected (closed):
When the voltage to the coil is disconnected, the armature (3) with the seat plate (6) is pressed down against the
valve orice by the closing spring (5) and inlet pressure. The valve will be closed for as long as the coil is
disconnected.
Coil voltage connected (open):
The valve opens directly for full ow when the voltage is applied to coil, the armature (3) with seat plate is lifted
clear of the valve orice. The valve will be open for as long as there is voltage to the coil.
Figure 1: Direct operated
Servo operated
EVT 2.0 and 3.0 is servo operated piston solenoid valves. The servo piston principle results in a fast operating and
compact valve that can open against a high dierential pressure.
When the coil is disconnected, the armature (3) with seat plate (6) is pressed down against the pilot orice by the
armature spring (8). Via the equalization orice in the piston (5), the pressure above the piston rises to the same
value as the inlet pressure and the piston closes the main orice. The valve will be closed for as long as the coil is
disconnected.
Coil voltage connected (open):
When current is applied to the coil, the armature (3) is drawn up into the magnetic eld and opens the pilot orice.
This relieves the pressure above the piston (7), i.e. the space above the piston becomes connected to the outlet side
of the valve. The dierential pressure between inlet and outlet sides then presses the piston away from the main
orice and now the main orice opens for full ow. Therefore, a minimum dierential pressure of 2 bar is necessary
to open the valve and 0.4 bar to keep it open.
• Media temperature of 0°C or higher when operating the valve for oil management lines.
• Danfoss recommends that a suitable lter or lter drier (< 40 microns) should be installed ahead of each solenoid
valve to keep scale, solder material and other foreign dirt and particles out of the valve.
068F0611Max. media TEMP 150 °C / 302 °CMax. AMB TEMp 50 °C / 122°FMOPD 110 bar / 1595, 4psi PS 140 / SWP 2030, 5MADE IN DENMARKDanfoss A/S 6430 Nordborg Denmark068F0611F171D00001
A (2 : 1)
Type
Opening dierential pressure with standard coil ΔP [bar]
Min.
Max. (=MOPD) liquid
220V-230V 50Hz / 018F6176
EVT 1.2 NC
0
110
EVT 2.0 NC
2
110
EVT 3.0 NC
2
110
Pos. no.
Descriptions
Materials
1
Valve housing
ECO Brass
2
Cover
Stainless steel
3
Armature assembly
Stainless steel
4
Gasket
Copper
5
Spring
Stainless steel
6
Seat plate
PEEK7Piston
ECO Brass
8
Guide pin
Stainless steel
Solenoid Valve, Type EVT
Product specication
Technical data
Ambient temperature
-40°C to 50°C
Max. working pressure
140 bar with copper connections and stainless steel connections.
Flow capacity
• For Kv values please refer to the tables in Ordering.
• The Kv value of the water ow in [m3/h] at a pressure drop across valve of 1 bar, ρ = 1000 kg/m3.
Opening dierential pressure range
Table 3: MOPD
NOTE:
EVT 2.0 and 3.0 need 0.4 bar to keep open and can’t be used as relief valve if the dierential pressure is lower than
0.4 bar.
Valve selection based on capacity calculation
As for extended capacity calculations and valve selection based on capacities and refrigerants, please refer to
Coolselector®2. Rated and extended capacities are calculated with Coolselector®2 calculation engine to ARI
standards with the ASEREP equations based on laboratory measurements of selected valves.
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