[tara zish]

I know for a fact that any vacuum pump, no matter how weak, will eventually create pressure far outside the safe zone if it pumps continuously without releasing. You need a “smart” pump, meaning a pump with a sensor that will tell it to turn off when the pressure rises above the target range, and back on again when it drops below the target range.

Thank you for your explanation. It's very interesting and I understand a lot better now, so I really appreciate your input. It seems that my original idea would be quite easy to implement, and would definitely work, but just wouldn't be safe.