What is the difference between the hydraulic cylinder and the pneumatic cylinder?

The principle of the two is the same, but the working medium is different, one is hydraulic oil, the other is gas

The hydraulic cylinder uses an oil pump to press the oil into the cylinder. A series of valves such as flow valve, pressure reducing valve, sequence valve, reversing valve, and one-way valve are needed to control it. It mainly depends on whether the working process of the machine is simple or not. To. The working principle is very simple. It uses Pascal's principle (F1/A1=F2/A2). The advantage does not require lubricating oil, because its working medium is, and it can realize remote control, can realize continuously variable speed, no noise, etc.

The pneumatic cylinder uses an air compressor to press air into the cylinder, and the principle also uses the Pascal principle. The advantages are light weight, low price (working medium can be seen everywhere), remote control, etc., shortcomings such as loud noise, etc.