Pre-lubrication metering devices for use in single-line lubrication systems


Series 321 single-port pre-lubrication metering devices were developed for use with single-line, centralized lubrication systems for oil and fluid grease. These metering devices are designed for installation directly in a lubrication point. This eliminates feeding lubricant via a lubrication point line, as well as the lubrication line at the lubrication point. It can be beneficial where space is limited. Choose from six types to meet application requirements.

Features and benefits:

  • Specially designed, single-port metering device for pre-lubrication
  • For direct connection to the main line
  • No separate lubrication line and fittings are necessary
  • Screw-in type can be monitored by a pressure switch in the main line; suitable for feed line ø 4 mm (oil) and ø 6 mm (fluid grease)
  • special types are available that differ according to their intended application:

    the elastomer components inside are made of NBR or FKM (FPM)
    321 G7 (fig. 1); 321 G4 (fig. 2); 321 Module (fig. 3)
    using union nuts or socket unions combined with tapered sleeves for connecting with the main line (M8×1, M10×1 or R1/8 taper)
    321 G
    (fig. 4); 321 T (fig. 5); 321 W (fig. 6):

Configure the product according your needs, download the CAD file

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