Bentone STERLING 40 ST108PL, Installation And Maintenance Instruction

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Function danfoss BFP11
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
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.
171 505 29 07-01
INSTRUCTIONS PUMP TYPE DANFOSS BFP11
Replacement of cartridge ilter, 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 low freely to the suction
side, a horse-shoe-shaped washer will
be mounted under the screw.
R
S
E
NC
A
G
H
V
P
1
P
D
C
- 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.