Gas Valve Selection - elco VECTRON G 05.700 MODULO Operating Instructions Manual

Overview

Gas valve selection

The gas pressure loss specified in the
table is to be added on to the combus-
tion chamber pressure in mbar.
G 05.700 MODULO
DMV512-T
Burner
Rp1,1/2
power
Natural gas E Hi = 10.365 kWh/m
(kW)
550 16
600 19
650 22
700 26
G 05.1000 MODULO
DMV512-T
Burner
Rp1,1/2
power
Natural gas E Hi = 10.365 kWh/m³
(kW)
550 17
600 20
650 23
700 27
750 31
800 35
850 40
900 44
950 49
1000 55
1
Example (for Burner G 05.1000 MODULO):
· System data:
Gas type: natural gas E
–
Gas flow pressure: 20 mbar (N.B.: at gas valve inlet)
–
Required burner power: 700 kW
–
Combustion chamber pressure with boiler rated load: 2.5 mbar
–
· Condition: working point must be within the burner's permissible field of work.
· Selected gas valve: DMV 520-T
· Checking the selection:
Gas pressure loss (from table):
–
Combustion chamber pressure:
–
Total
Hence: Gas flow pressure 20 mbar >19.5 mbar ð Selection of DMV520-T correct.
–
6
N.B.:
The calculated gas flow pressure is to
be complied with at the gas valve inlet.
To calculate the gas flow pressure
required at the transfer station, the
resistance of the burner supply conduit
including valves (ball valve, TAS, addi-
tional filter or counter) must also be
taken into account.
DMV520-T
Rp 2
3
Gas pressure loss (from gas valve inlet)
15
15
18
21
DMV520-T DMV525-R
Rp 2 Rp 2
Gas pressure loss (from gas valve inlet)
15 15
15 15
15 15
17 15
20 18
23 20
26 23
29 25
32 28
36 31
17 mbar
2.5 mbar
19.5 mbar
09/2005 - Art. Nr. 13 019 526A
DMV512-T
Rp1,1/2
Natural gas LL Hi = 8.83 kWh/m
17
21
24
28
DMV5065-R DMV520-T
DN65 Rp 2
Natural gas LL Hi = 8.83 kWh/m³
15 15
15 17
15 20
15 24
18 27
20 31
23 35
25 39
28 44
31 48
DMV520-T
Rp 2
3
15
16
19
22
DMV525-R DMV5065-R
Rp 2 DN65
15 15
15 15
17 17
20 20
23 23
26 26
29 29
33 33
37 37
41 41
DMV512-T
Rp1,1/2
Propane gas
Hi=25.89kWh/m³
15
15
17
20
DMV512-T
Rp1,1/2
Propane gas
Hi=25.89kWh/m³
15
15
16
18
21
24
27
30
34
38