30
Bentone BF1
General
P
G
R
V
A
V
S
C
H
P2
E
D
NC
NO
P1
D
5.2.3 Function BFP 52E
When the oil pump is started, oil is drawn from the suction connection (S)
through the filter (H) to the gear wheel (C).
From here the gear wheel pumps the oil over to the pressure side in connec-
tion with the pressure regulation (P1) and (P2).
When the oil reaches the cut-off valve (NC), the pressure rises until regulating
valve (P1) opens and holds the pressure constant at the set level. When
voltage is applied to the cut-off valve (NC) it opens and releases oil to
the nozzle (E). Surplus oil is led through the return channel to the return
connection (R). The pump will now run at the pressure set for stage 1, since
stage 1 is adjusted to a lower pressure than stage 2. If voltage is applied to
the solenoid valve (NO), it closes and sets the regulating valve (P1) out of
action. The pressure will now rise to the setting on regulating valve (P2).
The valve (P2) opens and holds the pressure constant at the set value for
stage 2. Surplus oil is led back through the return channel to the return
connection (R). On a 2-pipe unit the oil is led back to the oil tank.On a 1-pipe
unit the oil is recirculated across the changeover valve (A) through the return
channel (G). The return connection (R) is blanked off with a plug.
When the burner stops, the voltage to the solenoid valves is cut off so that
the NC valve closes and the NO valve opens. The oil flow to the nozzle is cut
off by the NC valve.
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