Function Danfoss BFP21L5
When the oil pump is started, oil is
drawn from the suction connection
(S) through the ilter (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 regula-
ting 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
171 505 10 10-01
Replacement of cartridge ilter
Mounting/dismounting return plug
How to remove cartridge ilter
from plug
Unscrew the cartridge ilter plug in
the cover by means of a 4 mm allen
key and withdraw the cartridge ilter. If
necessary, put a screwdriver between
the cartridge ilter and the plug and
turn the cartridge ilter carefully until
it comes off. Reject the cartridge ilter
and replace it by a new one. Press it
on to the plug. Ensure that the
O-ring is not damaged. Then it the
new cartridge ilter 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 BFP21L5
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.
