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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)