Alco Controls - Grobelny

Application Suction Pressure Regulation (evaporating or crankcase pressure) -
Nominal Capacities (kW)
Condensing
Temperature R 134a
Extended capacity kW
Evaporating temperature ° C
Valve
type
° C 0 5 0 - 0 -20
- - - - - EX5
60
3
0
2
9
2
8
2
6 4
EX6
EX7
30 27 24 8 3 EX8
- - - - - EX5
50
3 3
0
2
9
2
7 5
EX6
EX7
34 30 27 2 5 EX8
- - - - - EX5
40
3
2
3 3
0
2
8
2
6
EX6
EX7
38 34 30 23 7 EX8
- - - - - EX5
30
4
4
3
2
3 2
8
2
6
EX6
EX7
4 37 33 26 9 EX8
- - - - - EX5
20
4
5
4
3
3
2
3
9
2
7
EX6
EX7
45 40 36 28 2 EX8
22
Valve Type Kv, m3 /h R407C R22 R134a R404A
EX6 .57 3.9 4. 3. 3.5
EX7 5.58 4 5 3
EX8 6.95 42 45 34 38
Nominal capacities at +38°C condensing temperature, +4°C
evaporating temperature and 0. 5 bar pressure drop.
Valves must be installed with motor (head) downward in suction
line applications. This insures the valve life expectancy.
Multiply above nominal capacities by following factors
to obtain capacities at different pressure drops:
∆P, bar 0. 0 0. 5 0.20 0.30
Correction factor 0.82 .00 . 5 .4
Example:
EX6 provides 3.5 kW at 0. 5 bar pressure drop with
R404A or 3.5* .4 = 4.9 kW at 0.3 bar pressure
drop.
For other operating conditions, an Excel based selection
tool can be ordered from the ALCO sales offices,
or use the quick selection tables below.
Condensing
Temperature R 22
Extended capacity kW
Evaporating temperature ° C
Valve
type
° C 0 5 0 - 0 -20 -30 -40
- - - - - - - EX5
60
4
3
3
2
3 3
9
2
7
2
5 4
EX6
EX7
4 37 34 27 22 7 2 EX8
- - - - - - - EX5
50
4
5
4
3
3
2
3
0
2
8
2
6 5
EX6
EX7
45 4 37 30 24 9 4 EX8
- - - - - - - EX5
40
5
6
4
5
4
3
3 2
9
2
7 5
EX6
EX7
49 45 4 33 27 2 5 EX8
- - - - - - - EX5
30
5
7
4
6
4
4
3
2
3
9
2
7
2
5
EX6
EX7
53 48 44 36 29 22 6 EX8
- - - - - - - EX5
20
5
9
5
7
4
5
4
3
3
0
2
8
2
6
EX6
EX7
56 52 47 39 3 24 8 EX8
A2.5. /0604/E