35
DIAGRAM FOR MODULATING OR TWO-STAGE
PROGRESSIVE GAS AND DUAL FUEL BURNERS
AT NOMINAL THERMAL POWER > 2000 Kw
1
Modulating servomotor
2
Deflector with air and gas supply rate adjuster
screws
3
Gas supply modulating throttle valve
4
Safety gas valve
5
Pilot gas valve
6
Air pressure switch
7
Seal control device (LDU) and pressure switch
N° BT 8815
DETAILS ON THE BUTTERFLY VALVE FOR THE REGULATION OF THE
GAS DELIVERY
The notch shown on the end of the shaft indicates
the position of the butterfly valve (shutter)
N° 0002910611
REV.:05/11/2002
8
Connection between main valves for
the valve seal control device
9
Minimum and maximum gas pressure
switches with pressure take-offs
10 Gas pressure regulator
11 Filter
12 Anti-vibration coupling
13 Ball valve
14 Main flame gas valve