Datasheet Content
deltapumps.com
VU
BVU
Universal fuel unit
for oil burners
DE115-0613
Universal fuel unit
for oil burners
Type VU, BVU
1- Applications
The DELTA Universal fuel unit is an efficient and modern
oil burner pump. Since its mounting flange, hub and
shaft sizes are manufactured to international standards
(EN 225-1), it can be fitted to every type of high pressure
oil burner or transfer pump applications. Its features
allow an easy pump replacement with every other type
of oil pump. The same unit is provided with bilateral
nozzle ports and is suitable for both clockwise and
counter clockwise rotation.
WARNING
For the use with low viscosity fuel (lower than
2.5cSt, i.e. Kerosene) standard pump can be used
without exceeding 12 bar.
To pump biodiesel or fuel containing it in any
percentage, it is necessary the “B” version with
special seals. On request the pump can be provided
free of nonferrous metals.
This unit must not be used to pump water or acid.
2- Operation
The VU fuel unit consists of a pump, solenoid valve, filter
and pressure regulator valve (1) housed within one
casting. The pumping action is obtained from two spur
gears, one of which is connected to the drive shaft (3).
The pump casting provides the various oil ways, for the
suction (6), return (5) and nozzle ports (9). Pressure (8)
and vacuum (7) gauge ports are also provided.
Under the vacuum gauge is located the rotation From the suction side, the gears pass the oil to the
selector (2). See the Installation and Service Section. pressure chamber, where it comes up against the head
of the piston. Due to the build up of pressure, the piston
The VU unit is supplied in two pipe version (self priming).
is forced back against the pressure regulating spring.
On start up, the rotating gears purge the air from the The flow of pressurized oil is interrupted by an
suction chamber, through a vent groove in the piston to incorporated solenoid valve, and can, therefore, be
the return line in two pipe version, and through the opened following the start of the motor (pre-purge), or
nozzle line (after the solenoid valve opening) in one pipe interrupted before stopping the motor itself (instant shut-
version. off of the flame preventing the nozzle dripping). The
On initial commissioning, it is possible to bleed the air excessive oil discharges to the return side (or by-passes
more quickly, through the pressure gauge port. in the one pipe version). It will be realized of course that
the spring tension, which is varied by the regulator
Because a vacuum now exists oil, due to atmospheric screw, regulates the pressure of oil required.
pressure, enters the suction chamber through the filter.
The pump can be converted from the two pipe version to
the single pipe version, removing the by-pass plug (4)
from the return port.
When the unit is converted to the single pipe version, on
initial commissioning the air must be bled through the
pressure gauge port (in this case lift installation are not
recommended).
2-6
3- Pump identification VU 1 L R 2 FA
Pump type
VU = standard version
BVU = biodiesel version
(explicit request for nonferrous metals absence)
Nozzle capacity
(see graph)
Rotation - factory setting (seen from shaft end)
R = clockwise
L = counter clockwise
Nozzle line open - factory setting (seen from cover)
R = right
L = left
Pipes system - factory setting
1 = one pipe
2 = two pipes
Coil type
FA = NF84 230VAC 50/60Hz
FC = NF84 24VAC 50/60Hz
(coil with connector plug and cable set)
4- Technical specifications
Oil viscosity …………………………………. 1,2 ÷ 12 cSt
Oil temperature ……………………………... 60°C max.
Power consumption ………………………... See graphs
Nozzle capacity ……………………………... See graphs
Pressure range …………………………….... 6 ÷ 18 bar
Suction line vacuum ……………………….. 0,5 bar max.
Suction line pressure ……………….……... 2 bar max.
Return line pressure ……………………….. 2 bar max.
Starting torque ……………………………… 0,1 Nm max.
Rotation speed ……………..………….……. 3500 rpm max.
Standard strainer……….….………………... Nylon mesh 150µ, 20cm²
Dimensions (EN 225-1) …………………….. Hub Ø32, shaft Ø8
Connections (ISO 228-1) …………………... Inlet – Return : G1/4
Nozzle port : G1/8
Pressure – vacuum gauge : G1/8
Weight ……………………………………….. 1050 g
Standard factory settings ………………… Pressure setting: 10 ±0,3 bar
Standard coil: 230 VAC 50/60Hz
Standard cable set: 3 cores, 700 mm
5- Solenoid valve specifications
Power absorbed .……………………………. 9 W
Voltage tolerance …………………………… -15% / +10%
Ambient temperature .……………………... 0°C / 60°C
Operating pressure ……………………….... 25 bar max.
Flow factor (VDI/VDE 2173) ……………….. 0,059 m3/h
Cut-off pressure …………………………….. 6 bar
Approval (EN ISO 23553-1) ……………….. DIN CERTCO Reg.-Nr. 5S102/09
3-6
6- Diagrams
Nozzle capacity Power consumption
7- Overall dimensions
1 Pressure regulation 7 Vacuum gauge
2 Rotation selector 8 Pressure gauge
3 Shaft sealing 9 Nozzle ports
4 By pass 10 Solenoid valve
5 Return
6 Suction
4-6
8- Bypass installation
To convert the DELTA fuel unit from the two pipe version
to the single pipe version, do the following:
a) Using a 4 mm Allen key, unscrew the bypass plug
from the return port (Fig. 1).
b) Fit a 1/4" plug into the return port (Fig. 2).
WARNING
In the two pipe version the air is bled through the
return port. After conversion, the air must be bled
manually, through the pressure gauge port.
Make sure that the by-pass plug is not used in a
single pipe installation, because the fuel unit will not
function properly and damage to the pump and Fig. 3
burner motor could result.
9- Selection of rotation
The VU unit is provided with a screw for the selection of
rotation, located under the vacuum gauge plug (V).
To change the direction of rotation do the following:
a) Using a screw driver, remove the 1/8" plug from
vacuum gauge port. Under the plug, inside the
pump, is the selector screw.
NOZZLE NOZZLE
P VU1
L
V
b) Turn it 90° up to the stop, to change the rotati on
UNIVERSAL FUE
INLET
Made
Paten
(Fig. 3).
TV20
UN
After conversion, check the O-ring is located on the
bottom of the vacuum port and replace the 1/8" plug.
Fig. 1
Fig. 4
Clockwise Counter Clockwise
(seen from shaft end) (seen from shaft end)
NOZZLE NOZZLE
L
R
P VU1 V
UNIVERSAL FUEL UNIT
Made in Italy
INLET RETURN
Patent pending
TV2000U000022
UN L
IV ERSA
WARNING
Fig. 2 The selection screw must be oriented with the
groove vertical (L) or horizontal (R), otherwise the
fuel unit will not function properly and damage could
19 result (Fig.4).
5-6
10- Installation and Maintenance 12- Nozzle Cut-Off Test
1. Make sure that the by-pass plug is not used in a single pipe Fuel oil is not compressible but air is. Air trapped in the nozzle
installation, because the fuel unit will not function properly and line, anywhere between the fuel units nozzle port and the
damage to the pump and burner motor could result. nozzle itself, will compress during burner operation. Following
2. The rotation selector must be oriented with the groove burner shutdown, any trapped compressed air will expand
vertical (L) or horizontal (R). displacing the oil in the nozzle line, forcing continued oil flow
3. Do not use fuel with additives to avoid the possible formation through the nozzle that will, in effect, falsely appear to be poor
over time of compounds which may deposit between the gear fuel unit Cut-Off. This occurrence is particularly common with
teeth, thus obstructing them. low flow rate nozzles used in conjunction with long air tubes.
4. After filling the tank, wait before starting the burner. This will
To verify positive nozzle Cut-Off after burner shutdown, do the
give any suspended impurities time to deposit on the bottom of
following:
the tank, thus avoiding the possibility that they might be sucked
into the pump.…
