Pre-lubrication metering devices

On single-linemetering devices designed as prelubrication metering devices, the quantity of lubricant is fed to the lubrication point while pressure is being built up in the main line, i.e., during the lubrication unit’s run time. On prelubrication metering devices, the expelling pressure can be set so it is approximately equal to the maximum permissible pressure of the pressure regulating valve on the lubrication unit.

After the lubrication unit is switched on, the lubricant is drawn out of the lubricant reservoir by the lubricant pump and fed through the main line to the prelubrication metering device via the pressure relief valve and the pressure regulating valve. The pressure built up in the centralized lubrication system causes the metering piston to move toward the outlet(fig 2), expelling the lubricant (fig 1) that is upstream of the metering piston from the metering chamber and to the lubrication point through the lubrication point line. After the lubrication unit is turned off, pressure in the centralized lubrication system is relieved, which relieves pressure in the main line. In this process, spring tension causes the metering piston to return to its normal position. At the same time, the lubricant is moved from the spring chamber and into the metering chamber(fig 3). The prelubrication metering device is ready for the next lubrication cycle.

  • machine tool industry
  • textile machines
  • packaging machine 

In the table you can find the technical details of single-line distributors as prelubrication metering devices.

SKF logo