Factors rubber O-ring dimensional tolerances

In the dynamic sealing applications, taking into account the size of the tolerance factor for the same inner diameter d1, it is recommended to use a larger cross-sectional diameter. In static sealing applications, use a larger cross-sectional diameter than use a smaller cross-sectional diameter of more secure and reliable.

Select the inner diameter d1 principle of rubber O-rings. Selection principles rubber O-ring inner diameter d1 refer to the article 1.3 and 1.9 of the relevant content. The following recommended data in Table 1, the reference for selecting the size of the rubber.

Rubber O-ring mounting groove in the initial amount of compression (pre-compression) is critical, depending on the applications, the initial amount of the rubber compression recommendations are as follows:

Static sealing: When the oil pressure at 30MPa or less, the election (15 to 20)%; when the pressure is in the range of 30 ~ 60MPa, the election (20 to 25)%; when the pressure is in the range of 60 ~ 100MPa when the election ( 25 to 30)%. Dynamic sealing: When the oil pressure at 1MPa or less, the election (5-10)%; when the pressure is in the range of 1 ~ 15MPa, the election (10 to 15)%; when the pressure is in the range of 15 ~ 30MPa, the election ( 15 to 20)%.

Thus, when the rubber and chemical exposure caused increased volume and reduced installation trenches have enough space to accommodate. Similarly, the media pressure acting on the surface of the rubber, so that to improve the contact pressure required to achieve a good seal.

Rubber mounting groove commonly used rectangular area should be larger than the cross-sectional area of ??the rubber is about 25%.

Thus, when the rubber and chemical exposure caused increased volume and reduced installation trenches have enough space to accommodate. Similarly, the media pressure acting on the surface of the rubber, so that to improve the contact pressure required to achieve a good seal.

Selection and use of rubber O-ring

Reasonable selection of the seal performance and service life of hydraulic components play an important role. Combined with the author has long been engaged with some experience in this area experience accumulated on the rubber O-ring seal in the case of static and dynamic design principles, selection, pre-compression, groove dimensions, assembly precautions were described in detail, for peer reference.

Rubber has a good seal, sealing pressure within the range of 1.33 × 10-5Pa to 100MPa, because of its simple structure, reliable performance, low cost, easy matching, etc., it is widely used in various dynamic and static sealing applications.