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The Positive Displacement Injector (PDI) is the most widely used and critical metering and dispensing unit in single-line parallel centralized lubrication systems. It operates independently of other injectors, and through its precise internal structure, it can directly deliver a preset, accurate dose of lubricant (typically oil or light grease) to each individual lubrication point. This “point-to-point” precise lubrication method ensures that every friction pair receives just the right amount of lubrication, which is key to ensuring efficient and stable equipment operation.

Unlike the chain-reaction principle of progressive feeders, positive displacement injectors are connected in parallel to the main supply line. When the main line pressure reaches a set value, the piston inside each injector independently completes its stroke, forcing lubricant into its respective lubrication point. When the main line depressurizes, the piston resets, preparing for the next lubrication cycle. This independence means that if some injectors are blocked, other functioning injectors can continue to work.

Positive displacement injectors are widely used in various single-line parallel centralized lubrication systems that require stable, reliable, and fault-tolerant capabilities. Typical applications include:

• Small to Medium-Sized Machinery: Such as automated assembly lines, packaging machinery, printing presses.
• Machine Tools: Guide rails, ball screws, small bearings, etc.
• Chain Lubrication: Automatic lubrication for various conveyor chains and drive chains.
• Bearings and Gears: Precise lubrication for various independent bearings and open gears.
• Wind Power Generation: Yaw gears, pitch gears, etc.
• Lifting Equipment, Conveyor Belts, etc.