Bentone BF 1 KSV RME, Installation And Maintenance Instruction, Page: 29 / 44

29
Bentone BF1
Back to
suction
Return
plugged
By-pass plug
removed
One pipe
installation
Pressure
adjustment
To the nozzle
via external
solenoid valve
Gear set
Shaft seal
By-pass plug
inserted
Return Inlet
Vacuum
gauge port
Pressure
gauge port
Oil under pressure
By-passed oil
returned to tank,
or to suction
Oil under suction
Two pipe
installation
6.1.7 Function ANV47C
Pump working method
The oil pump is combined with an external solenoid valve that regulates oil
flow and providing a precise pressure within a large speed range.
The pump’s gear wheels draw oil from the tank through the integral filter
and conveys the oil to the regulator valve which pressurizes the nozzle
connection.
The quantity of oil that does not go to the nozzle connection is led through the
valve back to the return line, or in the case of a one-pipe installation, back to
the suction connection in the gear wheel pump.
- Two-pipe system
When the solenoid valve is not activated, the return plug channel between the
pressure side and the return side of the pressure valve is open. No pressure
will be built up to open the pressure valve, regardless of gear wheel pump
rpm. When the solenoid valve is activated, the return plug channel is shut.
The gear wheel pump’s rotation at full rpm quickly builds up the pressure
necessary for opening the valve and provides a sharp opening action.
- One-pipe system
Purging of the oil line system is not automatic in the one-pipe system; open
the manometer connection for purging.
Shut-down
When the burner stops, the solenoid valve opens the return plug channel
and drains oil to the return line. At that same moment the nozzle line is
closed. This provides a sharp cut-off. The on and off functions can be
controlled independent of motor rpm, and react very quickly. When the
solenoid valve is not activated torque is low up to full motor rpm.