The dust ring is mounted on the piston rod to prevent external dust from mixing into the reciprocating seal of the hydraulic cylinder.
Precautions for the use of dust rings: all dust rings can not be pressurized, that is, they do not have a sealing function, their role is only to prevent dust, must be used with other seals; In the design, the lip of the dust ring should be avoided from contacting the piston rod hole or the opposite side of the wrench, resulting in being cut.
The surface of the cylinder piston rod is adhered to an oil film. The use of the cylinder generally always have dust or sand, etc., these dust, sand, etc., and the oil film on the surface of the piston rod, will be brought into the cylinder, scratch the lip of the lip sealing ring on the piston rod, or scratch the surface of the piston rod, will cause medium leakage. Therefore, it is necessary to set a dust ring on the outside of the piston rod seal ring near the end face of the cylinder.
The dust ring is installed in the groove, because there is a certain amount of interference between the lip of the dust ring and the piston rod, so the lip of the dust ring is close to the surface of the piston rod.
The piston rod makes reciprocating movement, and the dust and sand 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 friction resistance between the dust ring lip and the piston rod.