FUNCTION DANFOSS BFP11
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.
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.
R
S
E
NC
A
G
H
V
P
1
P1
D
C
- 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
REPLACEMENT OF CARTRIDGE FILTER, MOUNTING/DISMOUNTING
RETURN PLUG
In case of one-pipe operation the horse-
shoe-shaped washer will be mounted
under the screw head, and in case of
two-pipe operation, the horse-shoe-
shaped washer will be removed.
The horse-shoe-shaped washer will be
introduced in all BFP 11-pumps .
To minimize the leak between cover
plate and pump housing when running
one-pipe operation, the changeover
screw will be mounted generally. But
in order for the return oil in the pump to
be able to flow freely to the suction
side, a horse-shoe-shaped washer will
be mounted under the screw.
171 505 29 00-01
