Industrial shaft seals

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gab.ru Radial Берг shaftАБ seals bergab@ya.ru Тел. (495)-228-06-21, факс (495) 22 Runout, mm 1,1 1,0 HDS and HS seals 0,9 0,8 0,7 0,4 0,3 CRS, CRW and HMS seals 0,2 0,1 CRW5 seals 0 1000 2000 3000 4000 5000 6000 7000 Speed, r/min Diagram 7. Maximum permissible runout as a function of rotational speed gab.ru 64 Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 22
gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, Industrial факс shaft seals (495) 22 Axial movement Small movements of the shaft with respect to the housing in the axial direction do not affect seal performance, provided that the total counter surface meets the same demands in respect of hardness, accuracy and surface finish. Permissible speed Guideline values for the permissible rotational and circumferential speeds for the different seal designs will be found in the section “Overview of SKF radial shaft seals”. If the circumferential speeds given in the overview are not sufficient for a particular sealing position, Diagram 8 on page 66 may be used. The diagram gives circumferential and rotational speeds related to the material of the sealing lip. The values are valid for springloaded lips which are well lubricated by a mineral oil, where adequate lubricant supply ensures that heat does not build up and where the pressure is the same on both sides of the seal (pressure differential = 0). In case of doubt, e.g. when the circumferential speed of the sealing lip is relatively high and there is no experience available in house, it is advisable to consult SKF. It will be seen from Diagram 8 that higher circumferential speeds are permitted for largediameter shafts than for shafts with smaller diameters. This is because the cross section of the shaft does not increase linearly with the increase in diameter but by the square of the increase in diameter, so that the heat removal capacity of a large shaft is much better than that of a small shaft. Generally, SKF Waveseals can be operated at higher circumferential speeds than those obtained from Diagram 8 because of the hydrodynamic form of the lip. The values obtained from Diagram 8 should be reduced if N radial shaft seals with a secondary, contacting lip are used, N lubrication is poor or grease lubrication is used, i.e. when there is little cooling of the sealing lip and poor heat transfer, N the counterface does not meet the demands in respect of surface finish or running accuracy, N there is a pressure differential across the seal. gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 65 22
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Industrial shaft seals

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