26
FUEL METERING
FUEL-IN
The inlet to the valve is located at its
top. Connect the incoming fuel hose
to its 3/8
th
inch flare elbow.
Do not use Teflon tape on flared
connections.
FUEL- Overflow
To prevent fuel from backing up inside the
valve and leaking from the join at the top of
the housing, the overflow tube will convey
excess fuel away from the valve.
The SEAT
The seat which the valve needle sits in is the narrowest
point of flow for fuel inside the valve. This makes it a
possible bottle neck that must not be allowed to become
plugged by debris or deposits from contaminated fuel.
Cleaning of the seat is performed without the use of
solvents or cleaning agents by dry polishing its walls with a
cotton swab or similar implement (see page 43, fig 87 82)
CAUTION!
• The fuel inlet & overflow are
flared fitting connections.
• NEVER use tape, putty or other
sealants on a flared fitting.
• The use of tape or other sealant
on threads may cause leaks.
THE VALVE NEEDLE & SEAT
The needle and seat open and close the fuel
inlet of the valve, allowing more fuel in
when needed, and keeping excess fuel out.
The needle and seat are controlled by the
float. The float is buoyant and is suspended
in a reservoir of fuel inside the valve, where
it rises and falls (fig 42 36) as the oil level
fuels the appliance and is replenished
FUEL
The needle & seat open and
close the fuel inlet
When the valve has filled to the oil level (fig 41 37)
the float will rise as the reservoir inside the valve fills
up.
When the valve is filled to its oil level, the float will
rise and push the needle up into the seat.
The rubber tip of the needle plugs the inlet hole to
the valve so that no additional fuel can make it’s way
inside once the valve oil level has been reached.
OIL
level
The Oil level is self
regulating
The reservoir inside the valve feeds the
burner through a specially machined
metering stem.
As fuel drips from the valve to the burner, the
oil level will drop slightly.
As the oil level drops, so does the float,
pulling the needle down to allow more fuel
to trickle in and replenish the reservoir.
FUEL-OUT
The outlet from the valve
is located on its
underside. It comes
already connected to a
flared copper fuel line
which in turn connects to
the burner inside the
appliance.
THE VALVE:
Oil level
mark
Valve
rating
mark
FIG 39
FIG 40
FIG 41
FIG 42
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