Cylinder repair what parts are replaced?

After disassembling the cylinder: 1, to clean the cylinder and piston; 2, replace all the seals; 3, if there is a valve to overhaul, to ensure that the sealing and flexible; 4, to deal with all the deformation of the part; 5, the installation of the experiment. Since you are repairing the cylinder, according to the specifications of the old seal to replace the new seal can be. Material requirements? Just look at the cylinder with the occasion. Such as nitrile rubber, fluorine rubber, hydrogenated nitrile oil resistance; fluoro-silicone rubber - both oil and high temperature resistance; silicone - high temperature resistance; PTFE wear, etc., generally mainly based on the requirements to choose the right material seals.