O-ring sealing ring is referred to as O-ring, which is a rubber ring with a circular cross-section shape. The O-ring is the most widely used seal in hydraulic and pneumatic systems. O-ring has good sealing performance, can be used for static sealing, can also be used for dynamic sealing; Not only can be used alone, but also is the basic component of many combined sealing devices. It has a wide range of use, and if the material is selected properly, it can meet the requirements of various media and various motion conditions.

O-ring is a extrusion seal, the basic working principle of extrusion seal is to rely on the elastic deformation of the seal, causing contact pressure on the sealing contact surface, the contact pressure is greater than the internal pressure of the sealed medium, there is no leakage, and vice versa.