Industrial shaft seals

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gab.ru V-ring Берг seals АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 22 Table 27. Coaxiality and runout tolerances Table 28. Axial displacement t 1 t 2 t 2 Shaft diameter nominal Total tolerance for coaxiality deviation and runout Shaft diameter nominal Permissible axial displacement d 1 t 1 over incl max d 1 t 2 over incl max mm mm mm mm V-rings, VR1 and VR2 designs V-rings, VR1 and VR2 designs 9,5 0,4 9,5 19,5 0,6 19,5 38 0,9 38 68 1,1 68 105 1,4 105 155 1,6 155 210 1,9 210 2020 3,6 V-rings, VR3 designs 135 630 1,5 V-rings, VR4 designs 450 2100 6 9,5 0,4 9,5 19,5 0,6 19,5 38 0,9 38 68 1 68 105 1,2 105 155 1,5 155 210 1,8 210 2020 4 V-rings, VR3 designs 135 630 1,5 V-rings, VR4 designs 450 2100 12 gab.ru 328Берг 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 Coaxiality and runout The total tolerance for the deviation from coaxiality and runout should not exceed the guideline values given in Table 27. Axial displacement Values for the permissible axial displacement of the V-ring with respect to its counterface are given in Table 28. Counterface Fine turned counterfaces are adequate for V- rings. Recommended surface roughness values are 2,5 µm for R a and 12 µm for R t . Misalignment V-rings can tolerate misalignment between shaft and housing axes, i.e. deviations from the perpendicularity between the shaft and counterface on the housing. Guideline values for the maximum permissible misalignment can obtained from Diagram 11. The values apply to V-rings of the VR1 and VR2 designs which are axially supported on the shaft. The permissible misalignment values for the very compact VR3-design V-rings are appreciably smaller. V-rings of the VR4 design, on the other hand, have a large seal cross section and permit larger misalignments. Where V-rings are not axially supported on the shaft, the maximum value obtained from the diagram should be reduced and the following equation should be used: = max – 0,0005 n where: max n permissible misalignment for V-rings without axial support operating at speed n, degrees maximum permissible misalignment from Diagram 1, degrees rotational speed, r/min Example: A 50 mm diameter shaft is misaligned by 1 ° with respect to the counterface on the housing. What speed can the shaft be run at if a V-ring of the VR1 design is to be used without axial support? From Diagram 8 max = 2 °, which gives the permissible speed max – 2 – 1 n = 0,0005 = 0,0005 = 2.000 r/min This corresponds to a sliding velocity of approximately 5 m/s. 4,0 3,0 2,0 1,0 0 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 Diagram 11. Maximum premissible misalignment for V-rings of the VR1 and VR2 designs gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс 329 (495) 22
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Industrial shaft seals

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