Industrial shaft seals

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gab.ru Radial Берг shaftАБ seals bergab@ya.ru Тел. (495)-228-06-21, факс (495) 22 Circumferential speed, m/s Rotational speed, r/min 40 35 15 000 10 000 9 000 8 000 7 000 6 000 5000 4 500 4 000 Silicone rubber (MVQ) Fluoro rubber (FPM) 3 500 30 3 000 25 20 2 500 Polyacrylate elastomer (ACM) 2 000 15 10 1 500 Nitrile rubber (NBR) 1 000 5 500 0 0 10 20 40 60 80 100 120 160 180 200 Shaft diameter, mm Diagram 8. Permissible speeds for spring-loaded seal lips where no pressure differential exists across seal in operation For permissible speeds for large diameter seals (shaft diameter > 200 mm / 8 inch) see seal selection chart starting on page 100. gab.ru 66 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 Lubrication In order for a radial shaft seal to be able to seal efficiently over a long period it is necessary to lubricate the sealing lip. This prevents actual lip counter surface contact and reduces friction as well as wear to the lip and counter surface. Dry running of sealing lips made of standard materials should be avoided at all costs. Because of this, the counter surface should be coated with a suitable lubricant when the seal is being installed, so that the sealing lip is lubricated right from the beginning. The medium being sealed is not only intended to lubricate the seal but also transport the heat generated by friction in the lip/counter surface contact. Thus, the medium must be able to reach the sealing lip in sufficient quantities from the very beginning. In applications where the seal has to retain oil or grease, lip lubrication is not normally a problem. Some rolling bearings, e.g. angular contact ball bearings, taper roller bearings and spherical roller thrust bearings, as well as gears, have a pumping action by virtue of their design. This means that the sealing lip can either be starved of lubricant or be subjected to excessive quantities of lubricant. In both cases steps need to be taken at the design stage in order to ensure that lubricant actually reaches the contact, or that excess quantities are removed. Where lubricant starvation has to be prevented, lubrication ducts can be provided. Where there is too much lubricant, a flinger can be installed between bearing and seal. When lubricants are not being sealed, grease or oil must be supplied separately so that the lip can be lubricated. In exceptional cases and where seals with a secondary (dust) lip or two sealing lips are used it may be sufficient to provide an initial fill of grease between the two lips. Lubrication of paired arrangements If two radial shaft seals are to be mounted in a common housing bore either in tandem or in a back-to-back arrangement, care must be taken to see that neither of the sealing lips can run dry at any time. To eliminate any risk of dry running, the free space between the seals or sealing lips should be filled with a suitable lubricating grease. To guarantee lubricant supply to the sealing lips in operation and to prevent dry running, the use of a spacer ring between the two seals is recommended. This ring should be provided with lubrication holes or an annular groove and lubrication holes (fig 44), so that grease can be supplied to the space between the sealing lips, e.g. via a grease nipple. gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 67 22 Fig 44
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Industrial shaft seals

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