O-ring is widely used in various occasions because of its low manufacturing cost and convenient use. So what should we pay attention to when buying o-ring? First of all, we need to understand the characteristics of o-ring, so that when we make a purchase, we know how to make a purchase.

The sealing mechanism of the o-ring is actually an automatic two-way sealing element, and its radial and axial pre-compression during installation will be combined with the initial sealing ability of the o-ring itself, which will increase with the increase of system pressure. Big.

Factors considered when choosing o-ring: 　　
1. Sealing form  　　
According to the type of load, it can be divided into static seal and dynamic seal. According to the sealing purpose, it can be divided into hole seal, shaft seal and rotary shaft seal; according to its installation form, it can be divided into radial installation and axial installation. For radial installation, for shaft seals, the deviation between the inner diameter of the o-ring and the diameter to be sealed should generally be as small as possible; for hole seals, the inner diameter should be equal to or slightly smaller than the diameter of the groove.
　　
2. Working medium and working conditions 　　
When selecting o-ring materials, generally, the compatibility with the working medium must first be considered, and then the pressure, temperature, continuous working time and operating cycle of the seal must be considered comprehensively.