Datasheet Content
Oil burners fuel unit
with pressure regulating
Type VD
www.deltapumps.com
VD1 - V5 flanged
Certified Quality System
Printed in Italy - DE111/0404
Oil burners fuel unit
with pressure regulating
Type VD
The DELTA fuel unit is an efficient modern oil burner
pump with compact design and since its mounting
flange, hub and shaft sizes are manufactured to 1
international standards (EN 225), it can be fitted to every
oil burner. 9
1- Features 2
8
• High suction capability.
• Suitable for one or two pipe systems.
• Self priming. 7
• Reliable pressure and positive cut-off (two pipe).
• Special rotary shaft seal. 3
• Silent operation. 4
• Low power absorption.
• Easily installed and adjusted.
5 6
• Pressure and vacuum gauge ports.
2- Applications From the suction side, the gears pass the oil to the
The DELTA fuel unit type VD is designed for pumping oil pressure chamber, where it comes up against the head
in high pressure oil burners and transfer pump of the piston. Due to the build up of pressure, the piston
applications. is forced back against the pressure regulating spring.
The outlet to the nozzle port, which until this point has
WARNING
been sealed by the seat on the head of the piston, opens
It must not be used to pump water or acid. and allows oil to flow through to the nozzle while the
excess oil discharges to the return side (or by-passes in
the one pipe version). It will be realized of course that
3- Operation the spring tension, which is varied by the regulating
The VD fuel unit consists of a pump, filter and pressure screw (1), regulates the pressure of oil required.
regulator/cut-off valve housed within one casting. The On shut down, the oil pressure of course immediately
pumping action is obtained from two spur gears (2), one drops and in this instance the spring, which hitherto has
of which is connected to the drive shaft (3). The pump been under compression, pushes the piston forward
casting provides the various oil ways, for the suction (6), onto its seat, thereby cutting off the oil flow to the nozzle
return (5) and nozzle (9) ports. Pressure (8) and vacuum outlet (two pipe version).
(7) gauge ports are also provided.
The VD unit is available in two pipe and one pipe In oil burner designs employing a magnetic valve in the
version. Both versions are self priming. oil line circuit, the cut-off seat on the piston head is
unnecessary and in these cases a "monotube" type
On start up, the rotating gears purge the air from the piston must be used in the pump. This type of piston is
suction chamber, through a vent groove in the piston to not fitted with a nozzle cut-off seat and its function is as
the return line in two pipe version, and through the a pressure regulator and safety valve, for instance for
nozzle line in one pipe version. On initial commissioning, expansion of pre-heated oil.
it is possible to bleed the air more quickly, through the The pump can be converted from the single pipe version
pressure gauge. to the two pipe version, fitting the by-pass plug (4) in the
Because a vacuum now exists oil, due to atmospheric return port.
pressure, enters the suction chamber through the filter.
2 Printed in Italy - DE111/0404
4- Pump identification VD 1 R L 2 4 U
Pump type
Nozzle capacity
(see graphs)
Rotation (seen from shaft end)
R = clockwise
L = counter clockwise
Nozzle line (seen from cover)
R = right
L = left
Pipes system
1 = one pipe
2 = two pipe
Pressure ranges Factory setting
3 = 2 ÷ 10 bar 4 ±0,3 bar
4 = 4 ÷ 15 bar (Standard) 10 ±0,3 bar
5 = 8 ÷ 20 bar 15 ±0,3 bar
6 = 10 ÷ 25 bar 20 ±0,3 bar
Special versions
U = cover type U with 65 cm² stainless steel filter,
mesh 110µ (standard on V5)
without pressure and vacuum gauge (except V5)
P = auxiliary pressure port
5- Technical Specifications
Oil viscosity ………………………………… 1,2 ÷ 50 cSt
Oil temperature …………………………….. 60°C max.
Power consumption …………………….. See graphs
Nozzle capacity……………………….…….. See graphs
Suction line vacuum ………………………. 0,5 bar max.
Suction line pressure ……………….…….. 2 bar max.
Return line pressure ……………………… 2 bar max.
Rotation speed ……………………….……. 3500 rpm max.
Standard strainer…………………………… Nylon mesh 150µ, 20cm² (VD1 9 cm²)
Dimensions (EN 225) ..……………………. Hub dia.32, shaft dia.8
Optional : flange hub dia. 54, shaft 7/16”
Connections (ISO 228/1) ……………….… Inlet – Return : G1/4”
Nozzle port : G1/8”
Pressure – Vacuum gauge : G1/8”
Weight ……………………………………….. gr. 950
3 Printed in Italy - DE111/0404
6- Diagrams
Nozzle capacity Power consumption
L/h Visc. 5 cSt (1.4°E)
2800 RPM
125
Visc. 5 cSt (1.4°E)
Watts 2800 RPM
100 V5 200
VD4
75 VD4 150 V5
VD3
VD3
50 100 VD2
VD2 VD1
25 50
VD1
5 10 15 20 25 Bar 5 10 15 20 25 Bar
7- Overall dimensions
84 ÷ 94
20
1 9
Ø32
7 63 V P
Ø8
40 Made in
Italy
28
7 8
23 19
25
42 54 (46xVD1)
5 6
96 (88xVD1)
7 8
1 9
20 34.5
Ø54 Ø10.5
Ø8
7 Made in
Italy
27.5
30.5
10
23 15 24 32 5 25 6
38 4 56 92
98 112
103
1 Pressure regulation
5 Return
6 Suction
7 Vacuum gauge
8 Pressure gauge
9 Nozzle port
10 Auxiliary pressure port
4 Printed in Italy - DE111/0404
8- By-pass installation
To convert the DELTA fuel unit from the single pipe
version to the two pipe version, do the following:
a) Using a 19 mm wrench, remove the 1/4" plug from
return port (Fig. 1).
V P b)…
