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Pump operating principle
6.1
The SUNTEC D oil pump is specially adapted for heavy oil (up to 75 cSt) and
high working temperature (up to 90°C).
Applications
B10 heating oil/biofuel blend (as defined in DIN V51603-6), medium
•
and heavy oils.
One-pipe or two-pipe system.
•
•
System with in-line solenoid valve for cut-off.
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 which does not go through the nozzle line will be dumped through
the valve back to the return line, in a two-pipe installation or, if installation is
one-pipe, back to the 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.
Bleed
Bleeding in two pipe operation is automatic. In one pipe operation, during
the starting period, air is purged through the nozzle line : the by-pass hole
of the nozzle plug allows air to pass to the nozzle line without opening of the
regulator valve.
For the first start up, bleeding can be accelerated by loosening the plug in a
pressure gauge port. system
Note
Owing to the presence of the nozzle by-pass hole, the pump has no cut-off
function. Cut-off must be provided by an external solenoid valve.
Models gear sizes "45" and "55" have a piston with a bleed slot to avoid build
up of pressure in the nozzle and suction lines during shut down due to the
expansion of oil caused by nozzle line heaters.
24
Bentone
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