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Positive Displacement Pumps
True positive displacement pump technology allows manufacturers to achieve the most accurate mixing ratios possible.
What is Positive Displacement (PD)?
Positive displacement (PD) is a method that moves a fixed volume of material at a constant flow and speed. To achieve true positive displacement, industrial finishing systems need to be set up to avoid material slippage and packing.
Graco uses dosing cylinder pumps for accurate mixing and dosing of plural-component material in factory paint mix rooms. Such technology ensures better mixing efficiency, maximum flow control and consistent performance. At the same time, it can reduce solvent use and material waste throughout your finishing operation, from the mix room to the spray booth or paint line.
Why Choose Positive Displacement Pump Systems?
Control
Positive displacement systems allow you to mix plural-component paint and other material with extraordinary accuracy. Dosing pumps ensure a constant flow rate and pressure, allowing paint mix room operators and painters to pause and resume their work at any time.
versatility
Mix up to four components at a time and experience effortless colour changes. Positive displacement pumps and mixing systems can process a wide range of materials at various pressures and speeds and using various catalysts.
Efficiency
Efficient systems can save you a lot of time and resources. Faster flushing and smooth colour changes mean that positive displacement pumps require less maintenance and produce less waste.
How it works
Are Positive Displacement Pumps Better Than Gear Pumps?
True positive displacement (PD) technology is slowly but surely replacing traditional gear pump systems for plural-component paint mixing.
Long promoted as the most suitable technology, gear pumps have a series of obvious flaws that can easily be solved by a PD proportioner.
Positive displacement vs. gear pumps
The gears in a gear pump wear down over time, allowing material to slip. This leads to inaccurate dispense.
With true positive displacement, a dosing cylinder pump can prevent material slippage completely, ensuring a smooth and consistent flow and lower maintenance costs.
How do Positive Displacement (PD) and Gear Pump Technology Compare?
 FLOW RANGE | PD PUMPS Wide flow range using only one pump | GEAR PUMPS Flow range limited to |
 ACCURACY | PD PUMPS Exceptional accuracy, | GEAR PUMPS Operate within 5% accuracy |
 PRESSURE | PD PUMPS High-pressure capability | GEAR PUMPS Maximum pressure |
 REACTION TIME | PD PUMPS Instant start-up, system maintains optimal | GEAR PUMPS Delays because of the need to build up |
 MAINTENANCE | PD PUMPS Low maintenance costs and easily repaired | GEAR PUMPS Expensive repair and maintenance, often |
 VISCOSITY | PD PUMPS Suitable for high | GEAR PUMPS Slippage of low viscous material |
 INLET PRESSURE | PD PUMPS Minimal impact from the inlet | GEAR PUMPS Sensitive to inlet pressure levels; |
ProMix PD Maximizes Mixing Accuracy
Up to 4 pumps
Say goodbye to bulky pumps taking up valuable space and complex setups combining various pumps. The ProMix PD can operate up to four different pumps, so you can mixe different recipes and manage many applicators with one system.
Automatic or manual
Whether you work with operators who are manually spraying parts or need a fully automated system, the ProMix PD has you covered. Customize setup based on your needs: from basic paint mixing proportioners to fully integrated robotic spray systems with precise monitoring and steering options.
Faster flushing
With the mixing point close to the applicator, ProMix PD makes flushing your system much more efficient. Reducing the area to be flushed not only cuts the time spent on flushing the system, it also wastes less material.
Up to 30 colors
Manage up to 30 colors and four catalysts when you equip your ProMix PD with a color change module and additional valve stacks. This easily combine typically separated materials, such as epoxy and urethane, metallic and non-metallic, or waterborne and solvent-borne.
