23
Bentone
6.2
Pump operating principle
The SUNTEC A2L oil pump has two nozzle outlets. It
incorporates two blocking solenoid
valves with in-line cut-off function, one for each nozzle
outlet.
Applications
•
Light oil, B10 heating oil/biofuel blend (as defined
in DIN V51603-6) and kerosene.
•
Two nozzle outlets.
•
Two independent blocking solenoid valves.
•
A sole regulator for both nozzle lines
Pump operating principle
The gear set draws oil from the tank through the built-in
filter and transfers it to the nozzle lines via the cut-off
solenoid valves. A pressure regulating valve is used to
bypass all oil which is not required at the nozzles.
In two-pipe operation, the by-pass plug must be fitted in
the return port, which ensures that the oil bypassed by the
regulating valve is returned to the tank and the suction
line flow is equal to the gear set capacity.
In one-pipe operation (by-pass plug removed and return
plugged), the oil which does not go through the nozzle
lines is returned directly to the gear inlet and the suction
line flow is equal to the sum of the 2 nozzle flows
Bleed
Bleeding in two-pipe operation is automatic : it is assured
by a bleed flat on the piston.
In one-pipe operation, the plug of a pressure gauge port
must be loosened until the air is evacuated from the
system
Cut-of
The solenoid valves of the A2L pump are of the ”normally
closed” type. Each solenoid valve is situated in one nozzle
line. 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 the solenoids are non-activated, the valves are
closed and all oil pressurized by the gear set passes
through the regulator to suction or to the return line,
depending upon pipe arrangement.
As soon as the solenoids are activated, oil passes to
the nozzle lines at the pressure set by the pressure
regulating valve. The two solenoid valves can be operated
independently
To nozzle 1
To nozzle 2
Solenoid valve 1 (NC) closed
Solenoid valve 2 (NC) closed
Solenoid valve 2
(NC) open
Solenoid valve 1
(NC) open
Pressure
gauge port
Pressure adjustment
Gear set
Vacuum gauge port
Suction Return
Return plugged
By-pass plug
removed
Back to suction
Shaft seal
By-pass
plug
Pressure
gauge port
Oil under suction
Oil under pressure
By-passed oil returned to
tank, or to suction
Two pipe installation
One pipe installation
Summary of Contents for B 30 A2.2
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