Choosing the optimal pump for your paint spray gun is a complicated process on several different factors. Once you’ve determined the material that you’ll be using the paint spray gun with, you’ll be relying upon a scientific calculation to determine the output you’ll require. This calculation includes the spray gun itself and any circulation you plan to have within the system.

Once you are able to determine the circulation required, the calculation begins by multiplying this figure by 1.2 to choose the pump of which output at 30 cycles per minute is the nearest.

The compression ration you will need is defined by the pressure losses due to the length and diameter of your system’s hose.

Here’s an example calculation provided by one of our distributors, Sames Kremlin:

Example let say you want to feed 3 conventional guns with an output of 500 cc/mn each, plus a circulation of 0,5 l/mn. The total output will thus be 2 l/mn. The optimal pump capacity would be: (2 000 x 1,2) ÷ 30 = 80 cc/ cycle. The best-suited pumps will be :

» the PMP 150 (output of 100 cc/cycle and pressure ratio of 1:1) for low viscosity materials and a small circulating (pressure loss < 3 bar).

» the 02.75 (output of 85 cc/cycle and pressure ratio of 2:1) for thicker materials and a normal circulating (pressure loss < 6 bar).

» the 04.120 (output of 240 cc/cycle and pressure ratio 4:1) for large pressure loss in circulating (up to 15 bar)Example let say you want to feed 3 conventional guns with an output of 500 cc/mn each, plus a circulation of 0,5 l/mn. The total output will thus be 2 l/mn. The optimal pump capacity would be: (2 000 x 1,2) ÷ 30 = 80 cc/ cycle. The best-suited pumps will be :

» the PMP 150 (output of 100 cc/cycle and pressure ratio of 1:1) for low viscosity materials and a small circulating (pressure loss < 3 bar).

» the 02.75 (output of 85 cc/cycle and pressure ratio of 2:1) for thicker materials and a normal circulating (pressure loss < 6 bar).

» the 04.120 (output of 240 cc/cycle and pressure ratio 4:1) for large pressure loss in circulating (up to 15 bar)

https://mcsupply.org/wp-content/uploads/2022/01/choosing-a-pump-and-pump-feeding-materials-reference-page.pdf

Pump Material Feeding Pump for Paint Spray Gun

Sames Kremlin also provides a guide to find the correct delivery of paint products using the following ranges of equipment depending on product viscoisty:

  • 0-300 cps: suction rod
  • 300 to 8,000 cps: top outlet pressure pots, pumps (gravity or suction rod), and pumps with base intake valves
  • 8,000 to 15,000 cps: bottom outlet pressure pots, pumps with suction rods, and a compressor
  • 15,000 to 30,000 cps: no use of pressure pots or suction rods, submerged hydraulic pumps with a compressor, and a pump with a single action elevator
  • 30,000 to 1,000,000 cps and over: pumps with a peak feeder and double action elevator

If you still have questions about this process, our knowledgeable and experienced customer service representatives at MC Supply are happy to assist you with this process. You can contact us toll free at 1-800-313-6561 or by email at sales@mcsupply.com.