Positive Displacement Injectors

Positive Displacement Injectors (PDI’s)

Positive Displacement Injectors are used with PDI manifolds and pumps. Positive Displacement Injectors (PDI’s) are an excellent means of providing oil lubrication to machinery. Using a piston principle, the PDI will lubricate individual points with specific amounts of oil. There are 6 output sizes to choose from: 0.06, 0.10, 0.16, 0.20, 0.30, and 0.50 cc’s per cycle. A typical system will include a pump, any number of PDI’s, and the necessary tubing and fittings.

At the start of the lubrication cycle, the PE-34 or PE-44 Series pump builds pressure. Upon pressure build-up, the PDI’s deliver the pre-set amount of oil. At the end of the lubrication cycle, a pressure unloading valve opens to return line pressure to 0 PSI. This allows the PDI’s to reset for the next cycle.

PDI Manifolds sold separately.


Positive Displacement Injectors are used with PDI manifolds and pumps.

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Model No.DescriptionOutput Volume (cc/cycle)
  1. For each lubrication point, select the appropriate Positive Displacement Injector (PDI) based on the oil output per cycle.
  2. Select the manifolds required for mounting that simplify installation.
  3. Select either a PE-34 Series Automatic Cyclic pump with built-in cycle controls, or a PE-44 Series standard pump that uses external controls for the lubrication cycle. A choice of reservoir capacities is available for both pumps. Click here for this series of pumps.

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