What is the working principle of hydraulic cylinder

What is the working principle of the hydraulic cylinder hydraulic cylinder's working principle is: when it comes to how it works I'll say it's the most basic components, cylinder and the cylinder piston and piston rod sealing device buffer device exhaust device of each cylinder work are almost similar, a manual jacks, for its original work, jack also is actually a simple cylinder. By manual pressurization stem ( Hydraulic manual pump) Make hydraulic oil through a one-way valve into the cylinder, then into the cylinder of the hydraulic oil, because of the single valve can't back, forcing cylinder rod up, and then work continue to make the hydraulic oil into the hydraulic cylinder, thus constantly on the rise, will send when they open the hydraulic valve, hydraulic oil back to tank. This is the most simple work originally, all the others on the basis of the improvement. With the principle of the oil cylinder cylinder about the advantages and disadvantages of oil cylinder and the cylinder due to the pneumatic system used in pressure. 。 Mpa range, so the cylinder is cannot make the high-power power element. It is possible to make a bigger of the power of the hydraulic cylinder components, using hydraulic pressure system, from medium air can be unlimited, no cost and supply difficulties, will be used directly into the atmosphere, easy to handle, not pollution. The hydraulic oil, by contrast, ha-ha. The resistance is less than the hydraulic oil viscosity is small, but the air compression ratio is greater than the hydraulic oil so its work stability and the response was much better.