50
GB
Gas diaphragm (natural gas only)
For proper burner operation in the event of particular boiler-burner-chimney couplings, or with low back pressure
in the combustion chamber, you may want to install the gas diaphragm anyway inside the entire burner operating
range. Refer to the pressure/flow curves indicated below
0
10
20
30
40
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
kW
mbar
2
1
2
1
3
3
VGD 20.403 (inlet pressure)
VCV 350 (inlet pressure)
VCV 240 (inlet pressure)
Pv (
pressure downstream of the ramp
)
G 1000
0
5
10
15
20
30
150
100
200
300
400
500
600
700
kW
mbar
800
1
2
1
2
VCV 240 (inlet pressure)
VCV 125 (inlet pressure) (max 590 kW)
Pv
(
pressure downstream of the ramp
)
G 700