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Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Technical data
Type
Opening differential pressure with standard coil ∆p [bar]
Min.
Max. (= MOPD) liquid 1)
10 W [AC] 12 W [AC] 20 W [DC]
EVR 2 0.00 38 – 33
EVR 3 0.00 38 – 18
EVR 6 0.05 21 25 18
EVR 6 NO 0.05 21 21 21
EVR 10 0.05 21 25 18
EVR 10 NO 0.05 21 21 21
EVR 15 0.05 21 25 18
EVR 15 NO 0.05 21 21 21
EVR 20 with AC coil 0.05 21 25 13
EVR 20 with DC coil 0.05 – – 16
EVR 20 NO 0.05 19 19 19
EVR 22 0.05 21 25 13
EVR 22 NO 0.05 19 19 19
EVR 25 2) 0.20 21 25 18
EVR 32 2) 0.20 21 25 18
EVR 40 2) 0.20 21 25 18
1) MOPD (Max. Opening Pressure Differential) for media in gas form is approx. 1 bar greater.2) Min. diff. pressure 0.07 bar is needed to stay open.
Refrigerants R22 / R407C, R404A / R507, R410A, R134a, R407A, R23, R32, R290, R600, R600a, R1234ze, R454B, DR55, R152A, R1234yf, R452B and R454B. For other refrigerants, contact Danfoss.
Special note for R32, R290, R600, and R600a: Use only for system in compliance with standard EN13463-1. Ignition risk is evaluated in accordance with standard EN13463-1. Only EVR 2 – EVR 20 with solder connections and without manual stem can be applied in systems with flammable refrigerants. For countries where safety standards are not an indispensable part of the safety system Danfoss recommends the installer to seek third party approval for systems containing R32, R290, R600, and R600a.
Note, please follow specific selection criteria stated in the datasheet for these particular refrigerants.
Temperature of medium -40 – 105 °C with 10 W or 12 W coil. Max. 130 °C during defrosting.
Ambient temperature and enclosure for coil See separate data sheet for coils and ATEX coils.
Capacity The capacity of the valve depends on the flow direction, see Kv values from the table.
The Kv value is the water flow in [m3/h] at a pressure drop across valve of 1 bar, ρ = 1000 kg/m3.
See extended capacity tables later in this data sheet.
Table of contents Technical data.............................................................................................................................................................................2
Capacity, Hot gas .................................................................................................................................................................... 19
Function .................................................................................................................................................................................... 42
Material specifications ......................................................................................................................................................... 43
Dimensions and weights ..................................................................................................................................................... 45
Data sheet | Solenoid valve, types EVR 2 − EVR 40 NC / NO
Rated liquid and suction vapour capacity is based on evaporating temperature te = -10 °C, liquid temperature ahead of valve tl = 25 °C, pressure drop in valve ∆p = 0.15 bar.
Rated hot gas capacity is based on condensing temperature tc = 40 °C, pressure drop across valve ∆p = 0.8 bar, hot gas temperature th = 65 °C, and subcooling of refrigerant ∆tsub = 4 K.
Data sheet | Solenoid valve, types EVR 2 − EVR 40 NC / NO
The normal range of coils can be used for the NO valves, with the exception of the double frequency versions of 110 V, 50/60 Hz and 220 V, 50/60 Hz.
TypeCurrent
typeConnection
size [in]Connection
size [mm]Manual
operationMax. Working Pressure [bar]
Kv value [m³/h] Code no.
EVR 6AC / DC 3/8 – No 45.2 0.80 032F1290
AC / DC – 10 No 45.2 0.80 032F1295
EVR 10AC / DC 1/2 – No 35 1.9 032F1291
AC / DC – 12 No 35 1.9 032F1296
EVR 15AC / DC 5/8 16 No 32 2.6 032F1299
AC / DC 7/8 22 No 32 2.6 032F3270
EVR 20
AC / DC 7/8 22 No 32 5.0 032F1260
AC / DC 1 1/8 – No 32 5.0 032F1269
AC / DC – 28 No 32 5.0 032F1279
EVR 22 AC 1 3/8 35 No 32 6.0 032F3268
Ordering (continued)
EVR solder connections, Normally Open (NO) - separate valve bodies
Valve bodies are supplied without flare nuts. Separate flare nuts: – 1/4 in or 6 mm, code no. 011L1101 – 3/8 in or 10 mm, code no. 011L1135 – 1/2 in or 12 mm, code no. 011L1103 – 5/8 in or 16 mm, code no. 011L1167
EVR flare connections, Normally Open (NO) - separate valve bodies
TypeCurrent
typeConnection
size [in]Connection
size [mm]Manual
operationMax. working pressure [bar]
Kv value[m³/h] Code no.
EVR 6 AC / DC 3/8 10 No 45.2 0.80 032F8085
EVR 10 AC / DC 1/2 12 No 35 1.9 032F8090
See separate data sheet for coils.The normal range of coils can be used for the NO valves, with the exception of the double frequency versions of 110 V, 50/60 Hz and 220 V, 50/60 Hz.
Data sheet | Solenoid valve, types EVR 2 − EVR 40 NC / NO
Capacities are based on:– liquid temperature
tl = 25 °C ahead of valve, – evaporating temperature
te = -10 °C, superheat 0 K.
Correction factors When sizing valves, the plant capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of valve/evaporator.
When the corrected capacity is known, the selection can be made from the table.
Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Capacities are based on:– liquid temperature
tl = 25 °C ahead of valve, – evaporating temperature
te = -10 °C, superheat 0 K.
Correction factors When sizing valves, the plant capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of valve/evaporator.
When the corrected capacity is known, the selection can be made from the table.
Data sheet | Solenoid valve, types EVR 2 − EVR 40 NC / NO
Capacities are based on:– liquid temperature
tl = 25 °C ahead of valve, – evaporating temperature
te = -10 °C, superheat 0 K.
Correction factors When sizing valves, the plant capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of valve/evaporator.
When the corrected capacity is known, the selection can be made from the table.
Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Capacities are based on:– liquid temperature
tl = 25 °C ahead of valve, – evaporating temperature
te = -10 °C, superheat 0 K.
Correction factors When sizing valves, the plant capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of valve/evaporator.
When the corrected capacity is known, the selection can be made from the table.
Data sheet | Solenoid valve, types EVR 2 − EVR 40 NC / NO
TypePressure
drop ∆p [bar]
Suction vapour capacity Qe [kW] at evaporating temperature te [°C]
-40 -30 -20 -10 0 10
R22/R407C
EVR 2
0.1 0.15 0.19 0.24 0.29 0.35 0.42
0.15 0.17 0.23 0.29 0.35 0.43 0.51
0.2 0.19 0.26 0.33 0.41 0.49 0.59
EVR 3
0.1 0.25 0.32 0.40 0.49 0.60 0.71
0.15 0.29 0.38 0.48 0.60 0.73 0.87
0.2 0.32 0.43 0.55 0.69 0.83 1.00
EVR 6
0.10 0.73 0.94 1.19 1.46 1.77 2.11
0.15 0.86 1.13 1.44 1.77 2.15 2.57
0.20 0.96 1.28 1.64 2.03 2.47 2.96
EVR 10
0.10 1.73 2.24 2.82 3.47 4.20 5.01
0.15 2.05 2.69 3.41 4.21 5.11 6.11
0.20 2.29 3.04 3.88 4.82 5.87 7.02
EVR 15
0.10 2.37 3.07 3.86 4.75 5.75 6.85
0.15 2.81 3.68 4.66 5.77 6.99 8.36
0.20 3.13 4.16 5.32 6.60 8.03 9.61
EVR 20
0.10 4.55 5.90 7.42 9.13 11.05 13.18
0.15 5.40 7.08 8.97 11.09 13.45 16.07
0.20 6.02 8.01 10.22 12.69 15.44 18.48
EVR 22
0.10 5.46 7.08 8.90 10.96 13.26 15.81
0.15 6.47 8.49 10.76 13.31 16.14 19.28
0.20 7.22 9.61 12.27 15.23 18.53 22.17
EVR 25
0.10 9.11 11.79 14.84 18.27 22.10 26.35
0.15 10.79 14.16 17.94 22.18 26.90 32.14
0.20 12.03 16.01 20.45 25.39 30.88 36.95
EVR 32
0.10 14.57 18.87 23.74 29.23 35.36 42.17
0.15 17.26 22.65 28.71 35.49 43.05 51.42
0.20 19.25 25.62 32.71 40.62 49.40 59.12
EVR 40
0.10 22.76 29.48 37.10 45.67 55.25 65.88
0.15 26.98 35.39 44.85 55.45 67.26 80.35
0.20 30.08 40.03 51.11 63.47 77.19 92.38
Correction factors When sizing valves, the evaporator capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of expansion valve.
When the corrected capacity is known, the selection can be made from the table.
Correction factors for evaporating temperature tl
tl [°C] -40 -30 -20 -10 0 10 15
R22/R407C 0.52 0.66 0.82 1.00 1.20 1.43 1.56
Capacities are based on liquid temperature tl = 25 °C ahead of evaporator.
The table values refer to the evaporator capacity and are given as a function of evaporating temperature te and pressure drop ∆p across valve.
Capacities are based on dry, saturated vapour ahead of valve.
During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 10 K superheat.
Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Capacities are based on liquid temperature tl = 25 °C ahead of evaporator.
The table values refer to the evaporator capacity and are given as a function of evaporating temperature te and pressure drop ∆p across valve.
Capacities are based on dry, saturated vapour ahead of valve.
During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 10 K superheat.
Correction factors based on evaporating temperature tl
Correction factors When sizing valves, the evaporator capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of expansion valve.
When the corrected capacity is known, the selection can be made from the table.
TypePressure
drop ∆p [bar]
Suction vapour capacity Qe [kW] at evaporating temperature te [°C]
Data sheet | Solenoid valve, types EVR 2 − EVR 40 NC / NO
Correction factors based on evaporating temperature tl
Correction factors When sizing valves, the evaporator capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of expansion valve.
When the corrected capacity is known, the selection can be made from the table.
TypePressure
drop ∆p [bar]
Suction vapour capacity Qe [kW] at evaporating temperature te [°C]
-40 -30 -20 -10 0 10
R404A/R507
EVR 2
0.1 0.12 0.16 0.20 0.25 0.31 0.38
0.15 0.14 0.19 0.25 0.31 0.38 0.47
0.2 0.16 0.22 0.28 0.36 0.44 0.54
EVR 3
0.1 0.20 0.27 0.34 0.43 0.53 0.65
0.15 0.24 0.32 0.41 0.52 0.65 0.79
0.2 0.27 0.36 0.47 0.60 0.74 0.91
EVR 6
0.1 0.60 0.79 1.01 1.27 1.57 1.91
0.15 0.71 0.95 1.23 1.55 1.92 2.33
0.2 0.80 1.08 1.40 1.78 2.20 2.68
EVR 10
0.1 1.42 1.88 2.41 3.03 3.73 4.54
0.15 1.69 2.26 2.92 3.68 4.55 5.54
0.2 1.90 2.57 3.33 4.22 5.23 6.37
EVR 15
0.1 1.94 2.57 3.30 4.14 5.11 6.21
0.15 2.32 3.09 4.00 5.03 6.23 7.58
0.2 2.60 3.51 4.56 5.77 7.15 8.72
EVR 20
0.1 3.74 4.94 6.34 7.96 9.83 11.95
0.15 4.46 5.95 7.68 9.68 11.97 14.58
0.2 5.00 6.75 8.77 11.10 13.75 16.77
EVR 22
0.1 4.49 5.93 7.61 9.56 11.79 14.34
0.15 5.35 7.14 9.22 11.62 14.37 17.49
0.2 6.00 8.10 10.53 13.32 16.50 20.12
EVR 25
0.1 7.48 9.88 12.68 15.93 19.65 23.89
0.15 8.91 11.90 15.37 19.36 23.94 29.15
0.2 10.00 13.50 17.55 22.19 27.50 33.54
EVR 32
0.1 11.97 15.81 20.29 25.49 31.44 38.23
0.15 14.26 19.04 24.59 30.98 38.31 46.65
0.2 16.00 21.61 28.07 35.51 44.01 53.67
EVR 40
0.1 18.70 24.70 31.71 39.82 49.13 59.73
0.15 22.28 29.75 38.41 48.41 59.86 72.89
0.2 25.01 33.76 43.86 55.48 68.76 83.85
Capacities are based on liquid temperature tl = 25 °C ahead of evaporator.
The table values refer to the evaporator capacity and are given as a function of evaporating temperature te and pressure drop ∆p across valve.
Capacities are based on dry, saturated vapour ahead of valve.
During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 10 K superheat.
Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Correction factors based on evaporating temperature tl
Correction factors When sizing valves, the evaporator capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of expansion valve.
When the corrected capacity is known, the selection can be made from the table.
TypePressure
drop ∆p [bar]
Suction vapour capacity Qe [kW] at evaporating temperature te [°C]
-40 -30 -20 -10 0 10
R32
EVR 2
0.1 0.25 0.31 0.39 0.47 0.56 0.66
0.15 0.30 0.38 0.47 0.57 0.68 0.81
0.2 0.34 0.43 0.54 0.66 0.79 0.93
EVR 3
0.1 0.42 0.53 0.65 0.79 0.94 1.11
0.15 0.50 0.64 0.79 0.96 1.15 1.36
0.2 0.57 0.73 0.91 1.11 1.33 1.57
EVR 6
0.1 1.24 1.57 1.94 2.35 2.80 3.30
0.15 1.49 1.90 2.35 2.86 3.42 4.03
0.2 1.70 2.17 2.70 3.29 3.93 4.64
EVR 10
0.1 2.95 3.72 4.60 5.57 6.65 7.83
0.15 3.55 4.51 5.59 6.79 8.11 9.57
0.2 4.03 5.16 6.41 7.80 9.34 11.02
EVR 15
0.1 4.03 5.10 6.29 7.62 9.09 10.71
0.15 4.86 6.18 7.65 9.29 11.10 13.09
0.2 5.51 7.05 8.77 10.68 12.78 15.08
EVR 20
0.1 7.76 9.80 12.10 14.66 17.49 20.60
0.15 9.34 11.88 14.71 17.87 21.35 25.17
0.2 10.60 13.57 16.87 20.54 24.57 29.00
Capacities are based on liquid temperature tl = 25 °C ahead of evaporator.
The table values refer to the evaporator capacity and are given as a function of evaporating temperature te and pressure drop ∆p across valve.
Capacities are based on dry, saturated vapour ahead of valve.
During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 10 K superheat.
Data sheet | Solenoid valve, types EVR 2 − EVR 40 NC / NO
Correction factors based on evaporating temperature tl
Correction factors When sizing valves, the evaporator capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of expansion valve.
When the corrected capacity is known, the selection can be made from the table.
TypePressure
drop ∆p [bar]
Suction vapour capacity Qe [kW] at evaporating temperature te [°C]
-40 -30 -20 -10 0 10
R290
EVR 2
0.1 0.18 0.23 0.29 0.36 0.44 0.52
0.15 0.21 0.28 0.35 0.44 0.53 0.64
0.2 0.24 0.31 0.40 0.50 0.61 0.73
EVR 3
0.1 0.30 0.39 0.49 0.61 0.74 0.88
0.15 0.36 0.47 0.59 0.74 0.90 1.08
0.2 0.40 0.53 0.68 0.84 1.03 1.24
EVR 6
0.89 0.89 1.16 1.46 1.80 2.19 2.62
1.06 1.06 1.39 1.76 2.18 2.66 3.19
1.18 1.18 1.57 2.01 2.50 3.05 3.67
EVR 10
2.12 2.12 2.75 3.46 4.27 5.19 6.22
2.52 2.52 3.30 4.18 5.18 6.31 7.58
2.81 2.81 3.73 4.76 5.93 7.24 8.71
EVR 15
2.91 2.91 3.76 4.74 5.85 7.10 8.51
3.45 3.45 4.51 5.72 7.09 8.64 10.37
3.85 3.85 5.10 6.52 8.11 9.91 11.92
EVR 20
5.59 5.59 7.23 9.11 11.24 13.66 16.37
6.63 6.63 8.68 11.01 13.64 16.62 19.95
7.39 7.39 9.81 12.53 15.60 19.06 22.92
Capacities are based on liquid temperature tl = 25 °C ahead of evaporator.
The table values refer to the evaporator capacity and are given as a function of evaporating temperature te and pressure drop ∆p across valve.
Capacities are based on dry, saturated vapour ahead of valve.
During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 10 K superheat.
Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Correction factors based on evaporating temperature tl
Correction factors When sizing valves, the evaporator capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of expansion valve.
When the corrected capacity is known, the selection can be made from the table.
TypePressure
drop ∆p [bar]
Suction vapour capacity Qe [kW] at evaporating temperature te [°C]
-40 -30 -20 -10 0 10
R600
EVR 2
0.1 – 0.08 0.13 0.17 0.22 0.28
0.15 – – 0.14 0.20 0.26 0.34
0.2 – – – 0.21 0.29 0.38
EVR 3
0.1 – 0.14 0.21 0.29 0.38 0.48
0.15 – – 0.23 0.34 0.45 0.57
0.2 – – – 0.36 0.50 0.64
EVR 6
0.89 – 0.42 0.63 0.86 1.12 1.42
1.06 – – 0.70 0.99 1.32 1.70
1.18 – – – 1.07 1.47 1.91
EVR 10
2.12 – 1.01 1.50 2.05 2.67 3.37
2.52 – – 1.65 2.36 3.15 4.03
2.81 – – – 2.55 3.49 4.53
EVR 15
2.91 – 1.38 2.05 2.80 3.65 4.61
3.45 – – 2.26 3.23 4.30 5.51
3.85 – – – 3.49 4.78 6.20
EVR 20
5.59 – 2.65 3.94 5.38 7.01 8.87
6.63 – – 4.35 6.21 8.28 10.60
7.39 – – – 6.72 9.19 11.93
Capacities are based on liquid temperature tl = 25 °C ahead of evaporator.
The table values refer to the evaporator capacity and are given as a function of evaporating temperature te and pressure drop ∆p across valve.
Capacities are based on dry, saturated vapour ahead of valve.
During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 10 K superheat.
Data sheet | Solenoid valve, types EVR 2 − EVR 40 NC / NO
Correction factors based on evaporating temperature tl
Correction factors When sizing valves, the evaporator capacity must be multiplied by a correction factor depending on liquid temperature tl ahead of expansion valve.
When the corrected capacity is known, the selection can be made from the table.
TypePressure
drop ∆p [bar]
Suction vapour capacity Qe [kW] at evaporating temperature te [°C]
-40 -30 -20 -10 0 10
R600a
EVR 2
0.1 0.08 0.11 0.16 0.20 0.26 0.32
0.15 – 0.13 0.18 0.24 0.31 0.39
0.2 – – 0.20 0.27 0.35 0.44
EVR 3
0.1 0.13 0.19 0.26 0.34 0.44 0.54
0.15 – 0.21 0.30 0.41 0.52 0.66
0.2 – – 0.33 0.45 0.59 0.74
EVR 6
0.89 0.38 0.57 0.78 1.02 1.30 1.61
1.06 – 0.63 0.90 1.21 1.55 1.94
1.18 – – 0.98 1.34 1.75 2.21
EVR 10
2.12 0.90 1.34 1.85 2.42 3.08 3.83
2.52 – 1.49 2.14 2.86 3.68 4.61
2.81 – – 2.32 3.19 4.15 5.24
EVR 15
2.91 1.23 1.84 2.53 3.31 4.21 5.24
3.45 – 2.04 2.92 3.92 5.04 6.31
3.85 – – 3.17 4.36 5.68 7.17
EVR 20
5.59 2.36 3.53 4.86 6.37 8.10 10.07
6.63 – 3.92 5.62 7.53 9.69 12.14
7.39 – – 6.10 8.38 10.93 13.79
Capacities are based on liquid temperature tl = 25 °C ahead of evaporator.
The table values refer to the evaporator capacity and are given as a function of evaporating temperature te and pressure drop ∆p across valve.
Capacities are based on dry, saturated vapour ahead of valve.
During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 10 K superheat.
Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Hot gas defrosting With hot gas defrosting it is not normally possible to select a valve from condensing temperature tc and evaporating temperature te.
This is because the pressure in the evaporator as a rule quickly rises to a value near that of the condensing pressure. It remains at this value until the defrosting is finished.
In most cases therefore, the valve will be selected from condensing temperature tc and pressure drop ∆p across the valve, as shown in the example for heat recovery.
Heat recovery The following is given:
y Refrigerant = R22/R407C y Evaporating temperature te = -30 °C y Condensing temperature tc = 40 °C y Hot gas temperature ahead of valve th = 85 °C y Heat recovery condenser yield Qh = 8 kW
The capacity table for R22/R407C with tc = 40 °C gives the capacity for an EVR 10 as 8.9 kW, when pressure drop ∆p is 0.2 bar.
The required capacity is calculated as :
Qtable = fevaporator x fhot_temperature x Qh
The correction factor for te = -30 °C is given in the table as 0.95.
The correction for hot gas temperature th = 85 °C has been calculated as 4% which corresponds to a factor of 1.04.
Qh must be corrected with factors found: With ∆p = 0.2 bar is Qh = 8.71 x 0.95 x 1.04 = 8.6 kW.
With ∆p = 0.1 bar, Qh becomes only 6.19 x 0.95 x 1.04 = 6.1 kW.
An EVR 6 would also be able to give the required capacity, but with ∆p at approx. 1 bar. The EVR 6 is therefore too small.
The EVR 15 is so large that it is doubtful whether the necessary ∆p of approx. 0.1 bar could be obtained. An EVR 15 would therefore be too large.
Result: An EVR 10 is the correct valve for the given conditions.
Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature te.Correction factors for evaporating temperature te
Type
Pressure drop
across valve∆p bar
Hot gas capacity Qh [kW]Evaporating temp. te=-10 °C. Hot gas temp. th=tc 25 °C.
Subcooling ∆tsub =4 K
Condensing temperature tc [°C]
20 30 40 50 60
R290 (continued)
EVR 20
0.1 17.68 18.40 18.80 18.81 18.33
0.2 24.79 25.86 26.46 26.49 25.83
0.4 34.46 36.09 37.03 37.16 36.29
0.8 47.01 49.65 51.26 51.67 50.63
1.6 61.45 66.22 69.32 70.55 69.63
An increase in hot gas temperature th of 10 K, based on th = tc 25 °C, reduces valve capacity approx. 2% and vice versa.
A change in evaporating temperature te changes valve capacity; see correction factor table below.
Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature te.Correction factors for evaporating temperature te
Type
Pressure drop
across valve∆p bar
Hot gas capacity Qh [kW]Evaporating temp. te=-10 °C. Hot gas temp. th=tc 25 °C.
Subcooling ∆tsub =4 K
Condensing temperature tc [°C]
20 30 40 50 60
R600 (continued)
EVR 20
0.1 9.80 10.62 11.28 11.74 11.97
0.2 13.36 14.63 15.65 16.36 16.73
0.4 17.42 19.55 21.24 22.44 23.12
0.8 20.21 24.29 27.44 29.71 31.11
1.6 22.17 27.85 33.51 36.00 39.36
An increase in hot gas temperature th of 10 K, based on th = tc 25 °C, reduces valve capacity approx. 2% and vice versa.
A change in evaporating temperature te changes valve capacity; see correction factor table below.
Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature te.Correction factors for evaporating temperature te
Type
Pressure drop
across valve∆p bar
Hot gas capacity Qh [kW]Evaporating temp. te=-10 °C. Hot gas temp. th=tc 25 °C.
Subcooling ∆tsub =4 K
Condensing temperature tc [°C]
20 30 40 50 60
R600a (continued)
EVR 20
0.1 10.98 11.69 12.19 12.45 12.42
0.2 15.15 16.23 17.00 17.41 17.41
0.4 20.33 22.09 23.37 24.10 24.21
0.8 25.51 28.74 31.09 32.55 33.06
1.6 29.73 33.10 38.19 41.57 43.30
An increase in hot gas temperature th of 10 K, based on th = tc 25 °C, reduces valve capacity approx. 2% and vice versa.
A change in evaporating temperature te changes valve capacity; see correction factor table below.
Data sheet | Solenoid valve, types EVR 2 – EVR 40 NC / NO
Function EVR solenoid valves are designed on two different principles:
1. Direct operation 2. Servo operation
1. Direct operation EVR 2 – EVR 3 are direct operated. The valves open directly for full flow when the armature (16) moves up into the magnetic field of the coil.
This means that the valves operate with a min differential pressure of 0 bar.
The valve plate (18) is fitted directly on the armature (16).
Inlet pressure acts from above on the armature and the valve plate. Thus, inlet pressure and spring force act to close the valve when the coil is currentless.
2. Servo operation EVR 6 – EVR 22 are servo operated with a "floating" diaphragm (80). The pilot orifice (29) of stainless steel is placed in the centre of the diaphragm. The pilot valve plate (18) is fitted directly to the armature (16). When the coil is currentless, the main orifice and pilot orifice 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 is drawn up into the magnetic field and opens the pilot orifice. This relieves the pressure above the diaphragm, i.e. the space above the diaphragm becomes connected to the outlet side of the valve.
The differential pressure between inlet and outlet sides then presses the diaphragm away from the main orifice and opens it for full flow. Therefore a certain minimum differential pressure is necessary to open the valve and keep it open. For EVR 6 – EVR 22 valves this differential pressure is 0.05 bar.
When current is switched off, the pilot orifice closes. Via the equalization holes (73) in the diaphragm, the pressure above the diaphragm then rises to the same value as the inlet pressure and the diaphragm closes the main orifice.
EVR 25, EVR 32 and EVR 40 are servo operated piston valves. The valves are closed with currentless coil. The servo piston (80) with main valve plate (84) closes against the valve seat (83) by means of the differential pressure between inlet and outlet side of the valve and the force of the compression spring (76). When current to the coil is switched on, the pilot orifice (29) opens. This relieves the pressure on the piston spring side of the valve. The differential pressure will then open the valve. The minimum differential pressure needed for full opening of the valves is 0.2 bar. EVR (NO) has the opposite function to EVR (NC), i.e. it is open with de-energised coil.