FUNCTION DANFOSS BFP41
When the oil pump is started, oil is
drawn from the suction connection (S)
through the filter (H) to the suction side
of the gear wheel (C).
The gear wheel then pumps oil to the
pressure side and the oil is put under
pressure.
The pressure is controlled and kept
constant at the set value by the
regulating valve (P
1
) with the diaphragm
(D).
The regulating valve (P
1
) distributes
the oil quantity supplied by the gear
set (C) between the nozzle port (E)
and the return side of the pump (R).
The oil quantity utilized is determined
by the set pressure on the regulating
valve (P
1
) and the size of the oil nozzle
in the nozzle line.
The valve (P
1
) functions in the following
way:
- When the opening pressure has been
reached, the passage to the return
side opens.
- The diaphragm and the spring keep
the pump pressure constant at set
value.
- If the pump is overloaded, i.e. if you
try to get out more oil than the gear
REPLACEMENT OF CARTRIDGE
FILTER
MOUNTING/DISMOUNTING
RETURN PLUG
171 505 08 00-01
set can supply under existing circum-
stances, the oil pressure falls below
the set value and the valve closes
against the return side (R) by means
of the diaphragm (D) and goes into
starting position.
This can be remedied by:
- Reducing the pump pressure.
- Reducing the oil quantity supplied
by using a smaller nozzle.
- Using a pump with a larger capacity.
BURNER WITH PREHEATING
Consider that the oil quantity is reduced
at preheating by 5-20% depending on.
- Rise in temperature at the nozzle
- Nozzle design
- Capacity (high capacity - small
difference)
HOW TO REMOVE CARTRIDGE
FILTER FROM PLUG
Unscrew the cartridge filter plug in the
cover by means of a 4 mm allen key
and withdraw the cartridge filter. If
necessary, put a screwdriver between
the cartridge filter and the plug and
turn the cartridge filter carefully until it
comes off. Reject the cartridge filter
and replace it by a new one. Press it
on to the plug. Ensure that the O-ring
is not damaged. Then fit the new
cartridge filter to the pump.
One pipe system
Two pipe system
R
S
E
NC
A
G
H
V
P
1
P
D
C
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