SC2 PUMP

The gear set draws oil from the tank through the built-in filter and transfers it to the regulator
which allows to regulate the pressure to the nozzle line.
Switching between low and high pressure is assured by a “normally open” by-pass solenoid
valve. When this solenoid valve 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.

Cut-off:
The solenoid valve of this pump is of the “normally closed ” type. This design ensures an
extremely fast response, in accordance with the different operating phases of the burner,
and does not depend on the motor speed.
When the solenoid is non-activated, and all oil pressurized by the gear set passes through
the regulator to the suction or return line, depending upon pipe arrangement.
As soon as the solenoid is activated, oil passes to the nozzle line at the pressure set by
the pressure regulating valve.

Bleed: Bleeding in two and one pipe operation is carried out by unscrewing the pressure port.

Installation: Note that configuration is not reversible.
– Two pipe installation:
All oil that does not go through the nozzle line will be dumped through the valve back to
the return line.
– One pipe installation:
The excess oil is directly returned to the gear set at the suction point; the suction flow
rate is then equal to the flow rate provided by the pump to the nozzle.