What factors should be considered in selecting O-ring seals?

Because of its low manufacturing cost and convenient use, O-ring is widely used in various dynamic and static sealing occasions.

Sealing mechanism of O-ring:

O-ring is an automatic two-way sealing element. During installation, its radial and axial pre compression gives the initial sealing capacity of the O-ring itself. It increases with the increase of system pressure.  

What factors should be considered when selecting O-ring seals:

1. Sealing form

According to the load type, it can be divided into static seal and dynamic seal; According to the purpose of sealing, it can be divided into hole sealing, shaft sealing and rotating shaft sealing; According to its installation form, it can be divided into radial installation and axial installation. During radial installation, for the shaft seal, the deviation between the inner diameter of the O-ring and the sealed diameter D2 shall be as small as possible; For the hole seal, its inner diameter shall be equal to or slightly less than the diameter D1 of the groove.

2. Working medium and working conditions

When selecting the O-ring material, the compatibility with the working medium should be considered first. The pressure, temperature, continuous working time, operation cycle and other working conditions at the sealing position must also be comprehensively considered.