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Dongguan Minz Rubber & Plastics Co., Ltd.

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Factors to be considered in the selection of O-ring

Release time:

2019-05-27 12:30

Source:

O-ringFactors to consider in choosing

1, working medium and working conditions in the specific selection of O-ring material, we must first consider the compatibility with the working medium. The working conditions such as pressure, temperature, continuous working time and operation cycle of the seal shall also be comprehensively considered. If it is used in rotating occasions, the temperature rise caused by frictional heat must be considered. The physical and chemical properties of different seal materials are different, see the Table of Raw Material Characteristics of Rubber Seals.
2, the sealing form according to the load type can be divided into static seal and dynamic seal; according to the sealing use can be divided into hole seal, shaft seal and rotating shaft seal; according to its installation form 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 d2 to be sealed should be as small as possible; for hole seals, the inner diameter should be equal to or slightly less than the diameter d1 of the groove.

Axial installation, to consider the pressure direction. Under internal pressure, the outer diameter of the O-ring seal should be about 1 ~ 2% larger than the outer diameter d3 of the groove; under external pressure, the inner diameter of the O-ring seal should be about 1 ~ 3% smaller than the inner diameter d4 of the groove groove.
　
1. Hardness of O-ring
The hardness of O-ring material is the most important index to evaluate the sealing performance. The hardness of the O-ring determines the compression of the O-ring and the maximum allowable extrusion gap of the groove. Since the nitrile seal of Shore A70 can meet most of the use conditions, if no special instructions are made for the sealing material, the nitrile rubber of Shore A70 is generally provided.
2. Extrusion gap

The maximum allowable extrusion gap gmax is related to the system pressure, the cross-sectional diameter of the O-ring and the hardness of the material. Generally, the higher the working pressure, the smaller the value of the maximum permissible extrusion gap gmax. If the gap g exceeds the allowable range, it will cause the O-ring to be extruded or even damaged.
 
3. O-ring seal is used as a rotating shaft seal

O-ring can also be used as a low-speed rotary motion and running cycle shorter rotary shaft seal. When the circumferential speed is lower than 0.5 m/s, the O-ring can be selected according to the normal design standard. When the circumferential speed is greater than 0.5 m/s, the phenomenon that the elongated rubber ring will shrink after being heated must be considered, so the sealing ring is selected to make its inner diameter about 2% larger than the shaft diameter sealed by it, and the above phenomenon can be avoided. After the sealing ring is installed in the groove, the sealing ring is radially compressed, and the O-shaped sealing ring forms a trace corrugation in the groove, thereby improving the lubrication condition.

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