Data Sheet for Product

M3FB…LX… Series Modulating Control Valve Technical Instructions
for Hot Gas Control Document Number CA2N4721E-P25
December 4, 2019
Siemens Industry, Inc. Page 3
Sizing
See Table 2.
NOTE: Correct valve sizing (to ensure a sufficiently large pressure drop p
v
100 across
the fully open valve) is the key to the correct operation of a refrigeration unit.
All the components must be coordinated, and this can be ensured only by the
refrigeration specialist.
The application examples that follow show the recommended pressure drop
in each case.
Refrigeration capacity in tons
Nominal capacity in tons at evaporation temperature to = 41°F (5°C)
Table 2. Selection Table for Hot-Gas Applications.
(Approximate Guide to Valve Size)
pv100
Refrigerant
Valve Product
Number
R407C (R22)
R134a (R12)
R404A/R507 (R502)
Condensation Temperature tc [°F]
122
104
86
122
104
86
122
104
86
0.5 bar
(7.2 psi)
M3FB15LX06/A
1.3
1.1
1.0
1.1
0.9
0.8
1.1
0.9
0.8
M3FB15LX15/A
3.1
2.8
2.5
2.7
2.4
2.1
2.6
2.3
2.1
M3FB15LX/A
6.3
5.7
5.1
5.4
4.8
4.0
5.1
4.6
4.0
M3FB20LX/A
10.5
9.4
8.5
9.1
8.0
6.8
8.8
7.7
6.8
M3FB25LX/A
16.8
15.1
13.7
14.5
12.5
10.8
13.9
12.2
10.8
M3FB32LX
25.3
22.8
20.5
21.6
19.1
16.2
21.1
18.5
16.5
1.0 bar
(14.5 psi)
M3FB15LX06/A
1.8
1.6
1.4
1.5
1.3
1.1
1.5
1.3
1.1
M3FB15LX15/A
4.6
4.0
3.4
3.7
3.1
2.8
6.5
3.1
2.8
M3FB15LX/A
8.8
8.0
7.1
7.4
6.5
5.7
7.4
6.5
5.7
M3FB20LX/A
14.8
13.1
11.7
12.5
10.8
9.4
12.2
10.8
9.4
M3FB25LX/A
23.6
21.1
18.8
19.9
17.4
14.8
19.6
17.4
15.1
M3FB32LX
35.6
31.6
28.2
30.2
26.2
22.2
29.3
25.9
22.8
4.0 bar
(58 psi)
M3FB15LX06/A
3.2
2.8
2.4
2.6
2.1
1.7
2.7
2.4
2.0
M3FB15LX15/A
8.0
7.1
6.0
6.5
5.4
4.3
6.8
6.0
5.1
M3FB15LX/A
16.2
14.2
12.0
13.1
10.8
8.3
13.7
11.7
10.0
M3FB20LX/A
27.0
23.6
19.9
21.6
17.9
13.7
22.8
19.6
16.5
6.0 bar
(87 psi)
M3FB15LX06/A
3.7
3.1
2.5
2.8
2.2
1.7
3.1
2.7
2.2
M3FB15LX15/A
9.4
8.0
6.3
7.1
5.4
4.3
8.0
6.5
5.4
M3FB15LX/A
18.5
15.7
12.8
14.2
10.8
8.3
15.7
13.4
11.1
M3FB20LX/A
30.7
26.2
21.1
23.6
17.9
13.7
26.2
22.2
18.2
8.0 bar
(116 psi)
M3FB15LX06/A
4.0
3.1
2.5
2.8
2.2
N/A
3.4
2.8
2.2
M3FB15LX15/A
10.0
8.0
6.3
6.8
5.4
NA
8.5
7.1
5.4
M3FB15LX/A
19.6
15.9
12.8
13.9
10.8
N/A
17.1
13.9
11.1
M3FB20LX/A
32.7
26.8
21.1
23.1
17.9
N/A
28.5
23.3
18.2
p
v
100 = Pressure drop across the fully open valve.