Enertech Bentone B1FUV Classic, Installation And Maintenance Instruction

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Oil temperature: -10 to+70°C
4. Cartridge i lter
Changing cartridge fi lter
Unscrew the i lter screw from the cover using a 4 mm Allen key and pull
out the i lter cartridge. Insert a screwdriver between the i lter and screw,
if necessary, to carefully ease out the i lter. Replace the old i lter by a new
one, pushing it on the i lter screw. Reassemble the cartridge and tighten
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06. INSTRUCTIONS PUMP TYPE BFP 41L3
BFP 41L3 operating principle
When the pump is started, oil is drawn from the suction port (S) th-
rough the i lter (H) to the suction port (C) of the gear-set.
The oil then moves to the pressure side of the gearwheel and is thus
pressurised. The pressure is controlled and maintained at a constant
pre-set level by diaphragm (D) of the control valve (P
1
)
The control valve (P
1
) distributes the oil supplied by gear-set (C) bet-
ween the nozzle connection (E) and the return port of the pump (R).
The amount of oil consumed is determined by the pressure set on the
control valve (P
1
) and by the size of the oil nozzle in the nozzle line.
The control valve (P
1
) operates as follows:
- When the oil attains opening pressure, the port to the return side opens.
- The diaphragm and the spring keep a constant pump pressure at the
set value.
- If the pump becomes overloaded, i.e. if an attempt is made to take out
more oil than the gear-set can deliver in the prevailing circumstances,
the oil pressure will fall below the set value causing the valve to close,
by diaphragm (D), to the return port (R) and return to the starting posi-
tion.
This can be remedied by:
- Lowering the pump pressure.
- Reducing the amount of oil delivered, i.e. changing to a smaller nozzle.
- Changing to a pump with higher capacity.
2(3)
H
A
G
R
S
P
V
C
NC
P
1
E
D
6.4 BFP 41L3 operation principle