The pressure has been calculated based on a 3 inch cylinder bore with a force factor of 7, using a 7 1/4 push plate, the picture below shows the PSI vs Pounds. The pressure is controlled by pressure regulators. Photo 2 shows the pressure on the gauge and the lbs on a scale. Photo 3 shows the press doing it's job and pressing two 8 inch wheels of cheddar that were made today at a 120 psi. Photo 4 is two hours in the press where I removed the cheese cloth and put it back in the press for the rest of the night