14
OIL METERING VALVE
Fuel
Inlet
Overflow
Gravity feed fuel line to burner
Oil Level
Indicator
Overflow
tube
OIL LEVEL
of 7” burner
OIL LEVEL
of 6” burner
6
Inch
burner
7
Inch
burner
Valve
Float
Valve
needle
& seat
High fire fuse
&
Calibration set screw
VIEW FROM ABOVE
The importance of the oil level
A natural draft diesel appliance relies on an uninterrupted flow of fuel to
keep burning and not extinguish.
The amount of fuel it receives is carefully pre determined by the settings and
flow allowance of the metering valve (fig 16)
The job of the metering valve is to keep the oil inside at a steady level. The
burner relies on the consistency of the valve’s oil level to make sure it is
receiving the correct amount of fuel (fig 15)
If the valve hasn’t been recently serviced, you may see an inconsistent oil
level that may cause flare ups, extinguishing or soot.
Keeping the needle & seat of the metering valve clean is the most important
maintenance step you can perform to keep a natural draft diesel appliance
running cleanly.
See page 43 for instructions on how to keep the metering valve clean
Valve calibration
mark
Oil Level Indicator
Setting indicator
(This valve is shown set
to the ‘OFF’ position)
Valve flow
settings
‘IN’ inlet
marking
Air-holes
Air-holes
FIG 15
FIG 16
FIG 17
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