A dust ring is a reciprocating seal installed on the piston rod to prevent external dust from entering the hydraulic cylinder.
Precautions for using dust rings: All dust rings must not be under pressure, meaning they do not have sealing function. Their function is only to prevent dust and must be used in conjunction with other sealing components; When designing, it should be avoided that the lip of the dust ring comes into contact with the piston rod hole or the opposite side of the wrench, causing it to be cut.
A layer of oil film adheres to the surface of the piston rod of the oil cylinder. The use of oil cylinders generally involves dust or sand particles, which adhere to the oil film on the surface of the piston rod and can be carried into the cylinder, causing scratches on the lip edge of the lip shaped sealing ring on the piston rod or the surface of the piston rod, resulting in medium leakage. Therefore, it is necessary to install a dust ring on the outside of the piston rod sealing ring, near the end face of the cylinder.
The dust ring is installed in the groove, and due to a certain degree of interference between the lip edge of the dust ring and the piston rod, the lip edge of the dust ring is tightly attached to the surface of the piston rod.
The piston rod moves back and forth, and the dust and sand particles adhering to the surface of the piston rod are removed by the dust ring. There is a certain gap between the right section of the dust ring lip and the piston rod, which can reduce the frictional resistance between the dust ring lip and the piston rod.