Common Knowledge Of O-ring

Working mechanism of O-ring: install the O-ring in the groove, deform it through the pressure of oil or gas, squeeze it toward the groove side, seal the sealed contact surface, and prevent the liquid flow or gas flow from passing through. This kind of seal has good sealing effect in the fluid power system. However, if the O-ring is not designed and used properly, it is easy to cause sealing performance failure.

Requirements for sealing ring materials of hydraulic system:

1. It has good stability in hydraulic oil, that is, small volume change, small expansion and contraction rate, difficult to dissolve, and will not cause hardness change; When the temperature changes within the range of use, the elasticity and hardness change slightly;

2. It has good sealing property and suitable elasticity, and has large compression resilience and small permanent deformation in hydraulic oil;

3. Good wear resistance, small friction coefficient, flexible movement and long working life;

4. Simple structure, convenient processing, use and maintenance.

Correct method for installing O-ring:

1. During installation, it is not allowed to scratch the O-ring, install it incorrectly, or twist the O-ring;

2. Before matching, the sealing groove and sealing coupling surface must be cleaned, and the contact surface in the matching of O-ring must be coated with lubricant;

3. In order to prevent the O-ring from being cut or scratched by sharp edges such as sharp corners and threads during installation, a 15 ° to 30 ° lead-in angle shall be reserved at the installed shaft end and hole end; When the O-ring needs to pass through the external thread, a professional thin metal jacket shall be used to cover the external thread;

4. Prevent missing installation and use of scrapped O-ring;