Lubricating Pump SureFire PDI

Single-line central lubrication systems are used mainly for the lubrication of machinery with following specification:

lubrication points: up to 100
pipe length: up to 30 m
pump pressure: up to 160 bar

General mechanical engineering, bottle cleaning machinery, calanders, plate conveyors, presses, type moulds, packaging machinery, machine tools, brickworks machinery, e.g.e.

The central lubrication pump feeds the lubricant into a main distribution line which runs alongside the machines. Branches lead to distributors of type ZE - C mounted singly or in groups in the vicinity of the lubrication points. Their function is accurately to meter the lubricant and to deliver it to the lines leading to the lubrication points, even against high back-pressures.

During one lubrication cycle the main line is pressurised, where upon metering of the lubricant to the lubrication points takes place. The pressure in the main line is then released into the suction chamber of the pump, causing the lubricant in the distributors to be supplied to the other side of the plunger, in readiness for the next cycle.

• The metered quantity can be adapted to the requirement at the lubrication point by changing the metering screw in each distributor segment.
• The system can be extended subsequently by connecting additional distributors, or may be reduced by disconnecting distributors.
• During the intervals between lubricating cycles the pressure in the main line is released so that the lubricant led into the districutors is supplied to the other side of the plunger for the next lubrication cycle. This also ensures that no lubricant reaches the lubrication points during the interval in an uncontrolled manner.
• The quantity of lubricant delivered to the lubrication points is to a large extent independent of the back-pressure.
• Systems with motor-driven pumps can be operated fully automatically with variable intervals between lubrication cycles.
• In comparison with central lubrication systems using oil, grease systems have the following advantages:
  • Grease adheres better to the sliding surfaces and is therefore not so easily forced out of the lubrication gap, event at high bearing pressures.
  • Grease forms a reserve in the lubrication connections and the lubrication pockets.
  • Grease stands up better to heavy and intermittent loads.
  • The grease forced out of the bearing forms a collar of grease which protects the bearing from the ingress of dirt and dust.