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951-180-076-EN
Version 0y
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3. Overview, functional description
3.2 Pump element operation
The delivery piston is forcibly actuated
(see Chapter 3.1, Operation of a multiline
pump unit).
In the suction stroke position (as illustrat-
ed), the cross hole of the control piston
(
3
) is closed. At the start of the pressure
stroke, the delivery piston (
1
) closes the
suction hole. The suctioned lubricant in
chamber
A
is pressed against the spring-
loaded control piston (
3
). The cross hole
in the control piston (
3
) is opened. The
lubricant reaches chamber
B
under pres-
sure through the cross and longitudinal
hole of the control piston (
3
), where it
flows through the ring duct and the check
valve (
5
) to the outlet. Once the pressure
stroke is complete, the suction stroke of
the delivery piston (
1
) begins.
Moving the delivery piston (
1
) also brings
the control piston (
3
) back to its normal
position using spring tension. The suction
stroke movement of the delivery piston (
1
)
generates negative pressure in chamber
A
.
When the intake hole opens, the lubricant
flows into chamber
A
due to the negative
pressure.
The pump element is now prepared for the
next lubrication cycle.
3.3 Designs
The FF and FB grease multiline pump units
differ in the following:
○
Design for grease or oil
○
Type and speed of drive
○
Gear ratio
○
Reservoir capacity
(FF = 4, 10 kg) (FB = 6, 15, 30 kg)
○
Number of pump elements
FF max. 12, FB max. 24
○
Monitoring of grease level and oil level
These result in correspondingly different
individual and total displacements and dif-
ferent operating pressures (see Chapter
4-Technical data).
-See Figure 3
