Regarding the O-rings for axial sealing
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According to GB/T 3452.3, the axial seal consists of a groove subject to internal pressure and an O-ring; the O-ring is larger in diameter than the groove, so it cannot be inserted into it in practice. It is specified in the standard that the outer diameter of the O-ring must be greater than or equal to the outer diameter of the groove. Is such a requirement correct?
Correct; a suitable compression deformation rate should be selected. To achieve self-sealing, the O-RING must undergo a certain amount of compression deformation when installed.
So in actual use, what if the O-ring is too large to fit inside the groove?
1. Determine the specifications of the O-ring; the outer diameter of the groove is generally: (inner diameter of the O-ring + 2 * wire diameter of the O-ring) × H11. 2. The compression rate ranges from 8% to 30%. 3. The groove edges and bottom of the O-ring groove are designed with radii; these radii serve to prevent the O-ring from being scratched during installation. It shouldn’t be impossible to install it, unless the dimensions of the grooves designed are not compatible with the specifications of the O-ring used.
1. Determine the specifications of the O-ring; the outer diameter of the groove is generally: (inner diameter of the O-ring + 2 * wire diameter of the O-ring) × H11. 2. The compression rate ranges from 8% to 30%. 3. The groove edges and bottom of the O-ring groove are designed with radii; these radii serve to prevent the O-ring from being scratched during installation. It shouldn’t be impossible to install it, unless the dimensions of the grooves designed are not compatible with the specifications of the O-ring used.
1. Determine the specifications of the O-ring; the outer diameter of the groove is generally: (inner diameter of the O-ring + 2 * wire diameter of the O-ring) × H11. 2. The compression rate ranges from 8% to 30%. 3. The groove edges and bottom of the O-ring groove are designed with radii; these radii serve to prevent the O-ring from being scratched during installation. It shouldn’t be impossible to install it, unless the dimensions of the grooves designed are not compatible with the specifications of the O-ring used.
Is it the wire diameter or the overall diameter that matters? If the wire diameter is too large, it cannot be used; if the diameter is too large, it will break and stick together
It’s possible that the O-ring was not shipped in the dimensions you specified; try fitting it over a mandrel to see if it matches the size of the O-ring you need
It’s possible that the O-ring was not shipped in the dimensions you specified; try fitting it over a mandrel to see if it matches the size of the O-ring you need
The O-ring and the groove are not perfectly matched; in the case of cold pumps, the O-ring is usually larger than the groove, and there are tricks needed to deal with this situation. The original poster will find out after trying a few more times