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 Fig 91 Fig 92 The spiral groove (fig 91) should have an enlargement of approximately 2 mm for each complete turn in the direction of rotation and should have a depth of between 0,05 and 0,1 mm with a radius of curvature of approximately 0,5 mm. All edges must be smoothed.V-rings may also be used as a secondary back-up seal (fig 92), for example, where it is necessary to protect the sealing lip and counterface of the primary seal against solid contaminants or corrosion. They have also been used to advantage to enhance the efficiency of labyrinth seals (fig 93). If the seating diameter lies in the appropriate range for two V-rings, the larger V-ring should always be chosen. Materials Normally V-rings are made from nitrile rubber (NBR). This has good resistance to wear as well as to chemicals and can be used for normal operating temperatures. For applications where higher temperatures occur or where aggressive media are present, V-rings made of fluoro rubber (FPM) can be supplied. The permissible operating conditions will be found in table 26. The chemical resistance of the rubber materials is described in the section entitled “Chemical resistance”. In the product table under the heading “Design and material”, the letters R and V are used to identify nitrile rubber and fluoro rubber, respectively. Warning: fluoro rubber seals will give off toxic fumes at temperatures above 300 °C. If overheated they are still dangerous to handle even once they have cooled down. Sliding velocities V-ring seals can be operated under the conditions given in table 26. It should be noted that at speeds above 15 m/s the sealing lip will lift from the counterface and the V-ring will only act as a gap-type seal. Fig 93 gab.ru 326Берг 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 Table 26. Permissible operating conditions 1 2 3 Operating conditions Guideline values for Guideline values for V-rings of V-rings of nitrile rubber fluoro rubber Operating temperature, ºC dynamic sealing – 40 to + 100 – 20 to + 150 static sealing – 40 to + 120 – 40 to + 230 Peripheral speed, m/s normal (1) up to 8 up to 6,5 axially located (2) 8 to 12 6,5 to 10 with support ring (3) >12 >10 with rotating counterface up to 20 up to 20 Pressure acting on seal, MPa static sealing or very low speed operation up to 0,03 up to 0,03 gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс 327 (495) 22
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Industrial shaft seals

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