A dual-line system has one high-pressure pump that feeds lubricants through two lines. These two lines are responsible for dispersing lubrication to multiple points within the system. End-of-line pressure switches are used to control and monitor the system. These flexible systems are simple to design and can be extended or reduced easily by installing additional metering devices or by removing them.

The functioning principle of the dual-line systems consists of two half-cycles. In the first half-cycle, the lubricant is pumped into the main line (A) and the main line (B) is connected to the relief line  The lubricant, which is dispensed through the change-over valve, is supplied to the metering devices  The pistons of the metering devices are moved into their adjusted end positions, thus dispensing an exact, metered quantity of grease.  Once all metering devices have dispensed their lubricant to the consumption point, the system is hydraulically closed, which causes the pressure in main line (A) to rise until to the preset pressure at the end-of-line pressure switch (mounted in the main lines prior the last metering device) is reached  This pressure switch then signals an electric pulse to the control unit, which turns the pump off and signals the change-over valve to relieve main line (A), and the pause time starts.  At this stage, half of the lubrication points in the system have been lubricated.

In the second half-cycle, main line (B) is pressurized and the cycle continues as before.

Dual-line metering devices can be combined with downstream progressive metering devices to increase lubrication points

Advantages & Characteristic

Reliable, precise, metered amount of lubricant, to up to 2000 lubrication points over long distances up to 120 m

Used on large systems

Lubricant from a high-pressure pump via a change-over valve at up to 400 bar (5,800 psi)

The LPU 08/14/24 pumps are used primarily in dual-line systems or as supply pumps and have a maximum operating pressure of 400 bar (5,800 psi). Depending on the system layout, these electric pumps can supply lubricant at distances of up to 120 meters (131 yd) and more. Available with a 40, 60 or 100 L reservoir, the pressure LPU 08/14/24 pumps come standard with a pressure relief valve, check valve, lubricant filter and a pressure gauge.

These robust units operate effectively at temperatures ranging from –20 °C to +80 °C (–4 °F to +176 °F) thanks to the integrated stirring device.

LPU 08/14/24  

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Dual-line Automatic Lubrication Systems

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The durable LSG metering devices are designed for dual-line systems with pressures of up to 400 bar (5,800 psi). These metering devices are available with up to eight outlets, and each pair of outlets is equipped with an indicator pin for visual monitoring. Also, the LSG metering devices are available with low-wear proximity switches, or piston detectors, for electrical monitoring. Additional features include rust-resistant material or acid-resistant material.

LSG  

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The durable LSL metering devices are designed for dual-line systems with pressures of up to 400 bar (5,800 psi). These metering devices are available with up to eight outlets, and each pair of outlets is equipped with an indicator pin for visual monitoring. Also, the LSL metering devices are available with low-wear proximity switches, or piston detectors, for electrical monitoring. 
Additional features include rust-resitant material or acid-resistant material. 

LSL 

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