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 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.
171 505 08 07-01
Replacement of cartridge filter
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)
Mounting/dismounting return plug
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
INSTRUCTIONS PUMP TYPE DANFOSS BFP41
