User Guide

Type B
Solid Cone
(For larger burners & where
air pattern is heavy in the
center or for long fires)
Figure 4
Solid Cone Nozzle (Type B)
Type B nozzles produce a spray which distributes
droplets fairly uniformly throughout the complete pattern.
This spray pattern becomes progressively more hollow at high
flow rates, particularly above 8.00 GPH. These nozzles may be
used in larger burners (those firing above 2.00 or 3.00 GPH) to
provide smoother ignition. They can also be used where the air
pattern of the burner is heavy in the center or where long fires are
required.
For Type B Del-O-Flo low flow nozzles see below.
Type W
(Can be used in place of
A or B types in reducing
specific problems)
Figure 5
Type W Nozzle
Type W nozzles produce a spray which is neither
truly hollow nor solid. These nozzles frequently can be
used in place of either solid or hollow cone nozzles between .40
GPH and 8.00 GPH, regardless of the burner’s air pattern. The
lower flow rates tend to be hollower. Higher flow rates tend to be
more solid.
Del-O-Flo
®
Nozzle
U.S. Patent #4,360,156; Belgian Patent #889,019; U.K. Patent #2,076,696
Del-O-Flo
®
nozzles are low-capacity nozzles
designed to minimize the usual Nozzle
plugging problems associated with low flow
rates. Del-O-Flo
®
nozzles are available in A
and B types.
Delavan performed a test in which a .50 gph
Del-O-Flo
®
nozzle and a .50 gph standard
hollow cone nozzle were run continuously for
23 hours from a double adapter using the
same oil supply. Engineers contaminated
clean oil with a controlled amount of iron
oxide, rust and sand. The pictures to the left
show the nozzles after the test (these views are
looking inside the nozzle body from the filter
end). You can see the iron oxide contamination
build up in the standard nozzle (Fig. 6).
Fig. 7 shows the same view of the Del-O-Flo
®
nozzle. Although the
dark streaks show a discoloration from sand, there is no
contamination build up.
5
Figure 6
Standard
hollow-cone
Figure 7
Delavan Del-O-Flo