Shaft rotation and nozzle location
C: Anti-clock. rotation/
Left hand nozzle (seen from
Shaft end)
APPLICATIONS FOR
SUNTEC AS67C
- Light oil.
- Nozzle flow up to 75 l/h (approx.
765 000 kcal/h - 890 kW).
- One or two-pipe system.
PUMP OPERATING PRINCIPLE
The SUNTEC AS oil pump has a built in
solenoid valve which controls the
regulator cut-off valve giving fast cut-off
and cut-on function independent of the
rotational speed.
The gear-set draws oil from the tank
through the built-in filter and transfers it
to the valve that regulates the oil
pressure to the nozzle line.
All oil which does not go through the
nozzle line will be dumped through the
valve back to the return line or, if it is a
one-pipe installation, back to the suction
port in the gear-set.
- TWO-PIPE OPERATION
When the solenoid valve is non-
activated, the by-pass channel between
the pressure and return sides of the
valve is open.
No pressure will then be built up to open
the valve. It does not matter which
speed the gear set has.
When the solenoid is activated, this by-
pass channel will be closed and because
of the full speed of the gear-set, the
pressure necessary to open the valve
will be built up very rapidly
AS:Solenoid valve
with cut-off
Gear set capacity
(see pump capacity curves)
C
67
AS
which gives a very sharp cut-on function.
- ONE-PIPE OPERATION
Bleeding on one-pipe is not automatic,
and a pressure port must be opened to
bleed the system.
CUT-OFF
When the burner stops, the solenoid
opens the by-pass at the same moment
which drains all the oil down to the
return and the nozzle valve closes
immediately. This gives a very sharp
cut-off function.
The cut-on and off can be regulated
regardless of motor speed and has an
extremely fast response.
When the solenoid is non activated, the
torque requirement is low up to full
motor speed.
To shaft
seal and
return
Oil under
suction
Oil under
pressure
By-passed oil
returned to
tank, or to
suction
To nozzle
Shaft seal
Return
From gear-set
By-pass
plug
Gear set
Solenoid valve closed
Solenoid valve open
Pressure
gauge ports
Vacuum
gauge port
Pressure
adjustment
Two pipe installation
One pipe installation
Back to suction
MOUNTING/DISMOUNTING
RETURN PLUG
EXCHANGE OF FILTER
One pipe system
Two pipe system
Pressure regulating
valve
171 505 12 98-01
Inlet
