Page 6 - Dual-line-automatic

Dual-line lubrication systems

System video

Introduction

System description

SKF dual-line systems can be used on large systems with dispersed The function principle of the dual-line systems consists of two
lubrication points that require varying lubrication quantities These half-cycles In the first half-cycle, the lubricant is pumped into the
systems utilize two main lines that are supplied alternately with main line (A) and the main line (B) is connected to the relief line The
lubricant from a high-pressure pump via a change-over valve at up lubricant, which is conducted by the change-over valve, is supplied to
to 400 bar (5 800 psi) Branch lines, along the main lines, are con- the metering devices The pistons of the metering devices are moved
nected with dual-line metering devices to supply a large volume of into their adjusted end positions, thus dispensing an exact, metered
lubricant to the lubrication points Within large dual-line systems, quantity of grease Once all metering devices have dispensed their
end-of-line pressure switches are used to control and monitor the lubricant to the consumption point, the system is hydraulically
system These flexible systems are simple to design and can be closed, which causes the pressure in main line (A) to rise until to the
extended or reduced easily by installing additional metering devices preset pressure at the end-of-line pressure switch (mounted in the
or by removing them A redesign of the system is not required Dual- main lines prior the last metering device) is reached This pressure
line metering devices can be combined with downstream progressive switch then signals an electric pulse to the control unit, witch turns
metering devices to increase the total number of lubrication points the pump off and signals the change-over valve to relieve main line
receiving small lubricant amounts SKF offers dual-line systems that (A), and the pause time starts At this stage, half of the lubrication
can dispense a precise, metered amount of lubricant to up to 2 000 points in the system have been lubricated
lubrication points over long distances up to 120 m (131 yd) and more, In the second half-cycle, main line (B) is pressurized and the cycle
depending on case values
continues as before
Even if one pair of outlets becomes blocked inside one metering
device, SKF dual-line systems provide sufficient lubrication for the
rest of the system’s lubrication points Lubricant volume can be
metered individually for each pair of outlets and can be monitored
visually or electrically

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