NOZZLE MIX SYSTEMS
3D
5 pipe dia.
8654 or 8655 Bleeder
Control Valve
air
impulse line
Limiting Orifice Valve
shutoff
gas
Nozzle Mixing Burner
Air/Gas Ratio Regulator
Figure 4
5. If the combustion chamber pressure fluctuates or is not atmospheric (sealed-in burners) and if gas pressure is less than air pressure, use a 3-pipe bleeder, as shown in Figure 5: this arrangement bleeds off a portion of the air impulse pressure to the combustion chamber so that fluctuations in combustion chamber pressure are neutralized by being applied to both sides of the controlling diaphragm in the gas regulator. Note: A 3-pipe bleeder can be used as a 2-pipe bleeder when the combustion chamber is at atmospheric pressure. In this case the piping connection to the combustion chamber can be omitted.
3D
5 pipe dia.
minimum min.
Control Valve
8654 or 8655 Bleeder
air
impulse lines
Metering Orifice
10D
shutoff
gas
Nozzle Mixing Burner
Air/Gas Ratio Regulator
Limiting Orifice
Figure 5
4D min.
28
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