The cylinder is composed of a cylinder body, a piston, a piston rod, a cylinder head and a sealing ring.
Piston seal is the seal between cylinder and piston. If the seal is not good, the performance of the cylinder will be affected, and the sealing groove will be opened on the piston.
The piston rod seal means the seal between the piston rod and the cylinder head. If the seal is not good, the oil will leak, and the sealing groove will be opened on the hole.
The sealing groove should be sealed on the shaft, that is to say, the piston seal, (hole seal), the seal groove on the hole, should be the seal, that is to say, the piston rod seal, (shaft seal).