22
Bentone
Applications for SUNTEC AS
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.
Applications
Light oil, B10 heating oil/biofuel blend (as defined in DIN
V51603-6) and kerosene.
- One or two-pipe system.
Pump operating principle
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 that does not go through
the nozzle line will be dumped through the valve back to
the return line in two pipe installation or, if it is a one-pipe
installation, back to suction port in the gear set.
In that case, the by-pass plug must be removed from the
return port, and the return port sealed by steel plug and
washer.
The solenoid valve of the AS pump is of the ”normally
opened” type.
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 is
closed and because of the full speed of the gear set, the
pressure necessary to open the valve will be built up very
rapidly, which gives a very sharp cut-on function.
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
cut-off can be actuated regardless of motor speed and
have an extremely fast response.
When the solenoid is not activated, the torque
requirement is low up to full motor speed.
Bleeding
Bleeding of pumps with two-pipe systems takes place
automatically, but bleeding can be accelerated by opening
a pressure port.
On pumps with a single-pipe system, a pressure port must
be opened to empty the system of air.
Solenoid valve
open
Solenoid
valve closed
To nozzle
Pressure
adjustment
Shaft seal
Back to
suction
By-pass plug
inserted
By-pass plug
removed
Pressure gauge ports
Vacuum gauge
port
Return plugged
Return
Inlet
One pipe installation
Two pipe installation
Gear-set
Oil under suction
Oil under pressure
By-passed oil
returned to tank,
or to suction
