Datasheet Content
Oil burners fuel unit
with solenoid valve
VM1 - VM4U flanged
Printed in Italy - DE101/0102
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
international standards (DIN 24220, EN 225), it can be
10
fitted to every oil burner.
Features 1
High suction capability.
Suitable for one or two pipe systems. 9
Self priming.
2
Reliable pressure and positive cut-off. 8
Solenoid valve incorporated.
Special shaft seal.
Silent operation.
7
Low power absorption. 3
Easily installed and adjusted.
4
Pressure and vacuum gauge ports.
Applications 5 6
The DELTA fuel unit type VM is designed for pumping oil
in high pressure oil burners and transfer pump
applications. From the suction side, the gears pass the oil to the
WARNING pressure chamber, where it comes up against the head
of the piston. Due to the build up of pressure, the piston
It must not be used to pump water or acid. is forced back against the pressure regulating spring.
The flow of pressurized oil is interrupted by an
incorporated solenoid valve (10), and can, therefore, be
Operation opened following the start of the motor (pre-purge), or
interrupted before stopping the motor itself (instant shut-
The VM fuel unit consists of a pump, solenoid valve,
off of the flame preventing the nozzle dripping). The
filter and pressure regulator valve housed within one
excessive oil discharges to the return side (or by-passes
casting. The pumping action is obtained from two spur
in the one pipe version). It will be realized of course that
gears (2), one of which is connected to the drive shaft
the spring tension, which is varied by the regulator screw
(3). The pump casting provides the various oil ways, for
(1), regulates the pressure of oil required.
the suction (6), return (5) and nozzle (9) ports. Pressure
The pump can be converted from the single pipe version
(8) and vacuum (7) gauge ports are also provided.
to the two pipe version, fitting the by-pass plug (4) in the
The VM unit is available in two pipe and one pipe return port.
version. Both versions are self priming.
On start up, the rotating gears purge the air from the
suction chamber, through a vent groove in the piston to
the return line in two pipe version, and through the
nozzle line (after the solenoid valve opening) in one pipe
version.
On initial commissioning, it is possible to bleed the air
more quickly, through the pressure gauge.
Because a vacuum now exists oil, due to atmospheric
pressure, enters the suction chamber through the filter.
Printed in Italy - DE102/0102
Pump identification VM 1 R L 2 4 P F
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 pipes
Pressure ranges Factory setting
3 = 2 ÷ 10 bar 4 ±0,3 bar
4 = 4 ÷ 15 bar 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 filter inox 65 cm²
mesh 110µ
without pressure and vacuum gauge
L = cover type L with filter nylon 9 cm²
mesh 150µ (only VM1)
P = auxiliary pressure port
K = nozzle port type K (4mm shorter)
Coil type
F = F84 coil with connector plug
M = M8 coil with flexible metal conduit
Technical specifications
Oil viscosity ………………………………… 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 ……………….……..
0,7 bar max
Return line pressure ……………………….1,5 bar max
Rotation speed ……………………….……. 3500 rpm max
Standard filter ……………………………… Nylon, mesh 150µ, 20cm²
Dimensions …………………………………. Hub ø32, shaft ø8 (DIN 24220)
Optional : flange hub ø54, shaft da 7/16”
Connections ………………………………... Inlet – return : G ¼”
Nozzle port : G1/8”
Pressure – vacuum gauge : G1/8”
Weight ……………………………………….. gr. 1100
Coil specifications ………………………… F84 380V 50-60Hz 230V 50-60Hz M8 230V 50-60Hz L=700mm
110V 50-60Hz 24V 50-60Hz 230V 50-60Hz L=260mm
24V 95Hz 24V DC 110V 60Hz L=700mm
12V DC 24V 50Hz L=300mm
L=300mm L=400mm 24V 50Hz L=700mm
L=500mm L=700mm 24V 50Hz L=700mm
L=1000mm L=1600mm 24V DC L=700mm
Printed in Italy - DE103/0102
Nozzle capacity Power consumption
Visc. 5 cSt (1.4° E)
L/h 2800 RPM
125
Visc. 5 cSt (1.4° E)
Watts 2800 RPM
100 200
VM4
75 VM4 150
VM3
VM3
50 100 VM2
VM2 VM1
25 50
VM1
5 10 15 20 25 Bar 5 10 15 20 25 Bar
88 ÷ 98
DELTA 10
Cod. F84
230V/50-60Hz
11VA s.c.
102
14…
