What you are talking about is probably a gas-liquid boosting cylinder.
1 The structure is gas pushing oil? The rear cylinder is used for boosting.
2 First, use air and oil to push it into the front cylinder. This means that the force given by the cylinder is not very large. After the front product is pushed, open another cylinder without oil to pressurize. At this time, the cylinder will still advance 20 mm to the front? This 20 mm is 5 tons of pressure?
Yes It's not like this