Industrial shaft seals

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gab.ru Wear Берг sleeves АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 22 Large diameter wear sleeves Fig 82. LDSLV3 with a flange Fig 83. Flangeless LDSLV4 General Large diameter wear sleeves, (LDSLV), are used primarily for applications where no Speedi-Sleeve is available, i.e. for shafts in the diameter range 203 to 1 150 mm (8 to 45 in). Two designs of LDSLV are produced; the LDSLV3 with a flange (fig 82) and the flangeless LDSLV4 (fig 83). Their use is recommended in all cases where the operating conditions for the seals are difficult, particularly where solid contaminants can reach the seal lip, e.g. in rolling mills and chemical plants. These are cases where seal wear and damage of the counterface on the shaft can be expected. It is recommended that LDSLV are designed into the application from the outset. During repairs, it will then not be necessary to rework the shaft and the original seal size can always be used as the replacement. Product features LDSLV are made of stainless steels, chrome plated with a hardness of ≈ 50 HRC and a surface roughness or 0,25 to 0,5 µm R a . The wall thickness of the standard sleeves is 2,54 mm (0.100 in). The sliding surface for the seal is fine machined and chromium plated to enhance the wear and corrosion resistance. The width of the counterface for the seal on the LDSLV3 is 6,4 mm (0.250in) narrower than the total width B of the sleeve. The flange height is 12,7 mm (0.500 in) for all sizes. Details of the possible diameters and widths of the sleeves will be found in Table 23, page 312, together with the sleeve and shaft tolerances. LDSLV4 are intended for applications where a flange (to ease mounting) is in the way, or where a wider sliding surface for the seal is required. The dimensions, tolerance recommendations etc. are otherwise the same as those quoted for the LDSLV3. gab.ru 310Берг 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 Use There are two alternative ways of using LDSLV for shaft repairs. Either the sleeve can be pushed along the shaft until it covers the damaged part and a seal which has a 4,8 mm (0.180 in) larger bore diameter than the original is used, or the shaft can be machined down 4,8 mm (0.180 in) and the original seal size used. The reworked shaft seating for the sleeve should have a surface roughness value of between 2,5 and 3,2 µm R a (100 to 125 µin) Mounting LDSLV are mounted with an interference fit on the shaft. It is therefore recommended that they are heated prior to mounting. Temperatures of up to 180 °C are permitted; on no account should the sleeve be heated (to) above 200 °C. The types of heating arrangements normally used for bearings are suitable, e.g. heating cabinets, oil baths or induction heaters. The thin-walled sleeves should be mounted immediately after heating as they cool rapidly. This is particularly true of the LDSLV4. Dismounting To dismount the sleeves it is recommended first to either heat them or to expand them by light hammer blows. The flange of the LDSLV3 should first be cut through at one point. gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс 311 (495) 22
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Industrial shaft seals

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