27 Bentone
Pump operating principle for AT2
The SUNTEC AT2 oil pump features 2 mode pressure
operation and incorporates a blocking solenoid valve
with in-line cut-off function. Switching between low
and high modes is assured by a 2nd integral solenoid
valvesolenoids are activat-ed, oil passes to the nozzle
lines at the pressure set by the pressure regulating valve.
Applications
Light oil, B10 heating oil/biofuel blend (as defined in DIN
V51603-6) and kerosene.
- Two firing rates (with a sole nozzle line).
- 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 nozzle line via the cut-off
solenoid valve. Pressure regulation is assured by two
spool valves, one for each pressure mode. Switching
between low and high pressure is assured by a ”normally
open” by-pass solenoid valve.
When this solenoid is non-activated, a by-pass channel
is open, allowing the normal functioning of the low
pressure regulating valve which sets the nozzle pressure.
When this solenoid is activated, the by-pass channel is
closed, thus pressure will build up on both sides of the
low pressure regulating valve eliminating its effect, and
the high pressure regulating valve now determines the
nozzle pressure.
The blocking solenoid valve of the nozzle line is of the
”normally closed” type. This design ensures extremely
fast response and the switching can be selected
according to the burner operating sequence and is
independent of motor speed.
When this solenoid valve is non-activated, the valve is
closed and all oil pressurized by the gear set passes
through the regulators to suction or to the return line,
depending upon pipe arrangement.
As soon as this solenoid is activated, oil passes to the
nozzle line at the pressure set by the pressure regulating
valves.
In two pipe operation, the by-pass plug must be fitted in
the return port, which ensures that the oil dumped by the
regulating valves is returned to the tank and the suction
line flow is equal to the gear set capacity.
Bleeding in two pipe operation is automatic (it is
assured by a bleed flat on the piston of the low pressure
regulator), but it may be accelerated by opening a
pressure port.
In one pipe operation, the by-pass plug must be
removed, and the return plugged. Oil which is not
required at the nozzle is returned directly to the gear inlet
via the pressure regulating valves, and the suction line
flow is equal to the nozzle flow. A pressure port must be
opened to bleed the system
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