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Selection of gas valve assembly
Selection of gas-valve assembly
· The gas-pressure loss indicated in
the table is to be added to the
furnace pressure reading (in mbar).
· The gas-flow pressure determined is
to be maintained at the inlet of the
gas-valve assembly. When
determining the gas-flow pressure
required at the transfer point,
remember to take into account the
resistance of the burner feed-conduit
Burner
power
Natural gas E Hi = 10,365 kWh/m
(kW)
G 05.700
550
DUO PLUS
600
650
700
MBVEF 412 MBVEF 420 VGG10
Burner
power
(kW)
550
600
650
700
G 05.1000
750
DUO PLUS
800
850
900
950
1000
Example:
· Specifications:
Type of gas supply: Natural gas E
–
Required burner power: 800 kW
–
Furnace pressure at rated boiler load: 3 mbar
–
Gas flow pressure at supply station at rated boiler load : 30 mbar
–
Pressure loss in gas pipe at rated boiler load : 1 mbar
–
· Selected gas valve assembly: MBVEF 420
· Testing of selection:
Gas pressure loss (from table):
–
Furnace pressure:
–
Pressure loss in gas pipe :
–
Total
–
Given: Gas flow pressure at supply station 30 mbar > 29 mbar ð Selection MBVEF 420 is correct.
–
24
and its fittings (ball valve, TAS,
additional filter or meter).
· The operating point of the installa-
tion must be inside the typical
authorized graph for the burner.
MBVEF 412
MBVEF 420
Gas pressure loss (from entry of gas valve assembly)
23
15
27
15
32
17
37
20
Natural gas E Hi = 10,365 kWh/m
Gas pressure loss (from entry of gas valve assembly)
22
15
15
26
15
15
31
16
15
36
19
15
41
22
18
47
25
20
53
28
23
60
31
25
66
35
28
73
39
31
25 mbar
3 mbar
1 mbar
29 mbar
03/2005 - Art. Nr. 13 018 104A
MBVEF 412
3
Natural gas LL Hi = 8,83 kWh/m
27
32
38
44
VGF10 MBVEF 412 MBVEF 420 VGG10
3
Natural gas LL Hi = 8,83 kWh/m
15
27
15
32
15
38
15
44
16
50
18
57
20
64
22
72
25
80
28
89
MBVEF 420
MBVEF 412
Propane gas
3
Hi=25,89kWh/m³
16
19
22
25
VGF10
3
16
15
15
19
15
15
22
17
15
25
20
17
29
23
19
33
26
22
38
29
25
42
32
28
47
36
31
52
40
35
16
19
23
26
MBVEF 412
Propane gas
Hi=25,89kWh/m³
15
15
15
17
19
22
25
28
31
34
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