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Sevanit Seals

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These are mainly designed for the sealing of large diameter shafts for robust structures (for example rolling mills). For the sealing of shafts up to an inner diameter of 380 mm it is recommended to primarily use the Gufero shaft seal according to ČSN 9401 (Czech standard norm). The sealing area of the edge is made up with a small sealing land, which reaches from the sharp area of the edge up to a distance of 2 to 5 mm, depending on the size of the Sevanit. The sealing edge – inner part of the Sevanit shaft seal, which directly adjoins the shaft to be sealed, consists of the sharp area of the edge and the sealing area of the edge. A draw spring – a part of Sevanit, presses the sealing edge onto the shaft.

In general:

Usage:

The Sevanit shaft seals are used for the sealing of shafts with a rotating movement. They prevent leakage of various lubricants, fluids, or other types of substances from the sealed area and prevent penetration of dust, impurities and water into the area.
In special cases, for example during the sealing of heavily aggressive oils and fluids, during extreme temperatures, higher circumferential speeds, or a greater overpressure, it is necessary to make an agreement concerning the method of sealing and the type of rubber used with the manufacturer. Guidelines for construction and fitting. The correct functioning and the lifespan of the Sevanit shaft seal are subject to compliance with the construction and fitting guidelines.

Shaft Design

The machining of the shaft for the circumferential speed from 4 to 12m/s has to be performed by grinding without feed. The surface of the shaft must not contain any grooves or any other damage, caused by unprofessional manipulation or assembly. After a long period of storage, the effect of the mounted spring causes a permanent deformation of the rubber and the inner diameter is reduced. This reduction in diameter does not have an effect on the quality of the Sevanit shaft seal.

Recommended roughness of the shaft surface:

  • for the circumferential speed of up to 2 m/s Ra 0.8
  • for the circumferential speed from 2m/s to 4m/s Ra 0.4
  • for the circumferential speed from 4m/s to 12m/s Ra 0.2 to 0.4

Recommended treatment of the shaft:

for circumferential speeds from 4 to 12m/s it is suitable to treat the surface (by cementing or hardening) in such a way, so that the hardness of the surface is from 45 to 60 HRC.

  • If it is not feasible to thermally process the shaft, with regards to the material used, then it is possible to use hardened bushings, or a hard weld deposit,
  • from 8 to 12m/s it is suitable to hard chrome and polish the surface for hardening (thickness 0.02 – 0.03mm)
  • all of the sharp rims of the shaft which come into contact with the edge of the seal during fitting must be rounded, or removed. If it is not possible to perform the rounding due to construction reasons, then it is necessary to use the bushings.

Fitting of the seal

  • before the fitting, the edge is wiped with a soft cloth over the entire perimeter and the placement of the spring in the groove is checked
  • before putting the seal on, it is recommended to soak the shaft seal for a period of about 15-30 min. in fluid, which is to be sealed, or different fluid with characteristics similar to the sealed substance, the temperature of which  ranges from 16-25°C. This procedure is especially important after a long period of storage.
  • the surface of the shaft is coated with the substance to be sealed (oils, lubricants, etc.)
  • the Sevanit seal shaft - HP type is fitted by placing it into the seating area in such a way, so that the spring points towards the sealed medium
  • while pulling the seal over threads of the holders or the shaft shoulder, it is necessary to use bushings, preventing damage to the sealing edge

Technical essentials of the order

  • identification of the Sevanit type shaft seal with its name, supplemented with the type (P or HP)
  • dimension (inner diameter, outer diameter, height)
  • possible specification of the substance to be sealed and its aggressiveness, increased temperature, etc.
  • use the catalogue number

Material

The Sevanit shaft seal is manufactured from the rubber 40-235 unless otherwise requested. The draw spring is made of steel wire according to the ČSN 6450.2 (Czech standard norm).

After a long period of storage, the effect of the mounted spring causes a permanent deformation of the rubber and the inner diameter is reduced. This reduction in diameter does not have an effect on the quality of the Sevanit shaft seal.

Design and allowed defects of the seal

  • No defects are allowed on the sealing land of the edge and on the sharp area of the edge.
  • Appearance defects are allowed on other surfaces of the rubber part, for example:
  • prints from the damaged mould on the surface, or up to a maximum depth of +/- 0.4 mm
  • short mouldings of the seating for the spring are allowed at the extent of 10 to 100 mm according to the size of Sevanit
  • depressions and protrusions at the depth or height of 0.2 mm and a total maximum area of 20 mm² of the total number of 10 occurrences on the surface of a single ring
  • deviations in the flatness of the ring’s face are allowed at the extent of 0.5 to 1.5 mm

The spring is finished off on one end with a cylindrical or conical shoulder (lock) for connection. After being twisted it does not have to be precisely circular, nonetheless it must not have sudden changes in curvature after being twisted. The connection of the spring must be solid. For larger diameters the spring is made out of several pieces. During testing there must not be permanent deformation exceeding 4% of the original length.

Marking

Every Sevanit shaft seal must bear the dimension labelling, for example 390 X 430 x 20

Testing

  • the Sevanit seal finish, that is to say the sealing edge, the sealing land of the edge, appearance defects, labelling and the spring finish are evaluated by eye,
  • the flatness is measured using gauges by placing the sealing ring on a flat plate
  • the dimensions of the sealing rings and the allowed deviations are measured with gauges with corresponding accuracy
DescriptionCatalogue number
Sevanit Shaft Seals 030x055x012,0 HPS030055012.0HP
Sevanit Shaft Seals 035x060x012,0 HPS035060012.0HP
Sevanit Shaft Seals 040x065x012,0 HPS040065012.0HP
Sevanit Shaft Seals 045x070x012,0 HPS045070012.0HP
Sevanit Shaft Seals 050x075x012,0 HPS050075012.0HP
Sevanit Shaft Seals 055x080x012,0 HPS055080012.0HP
Sevanit Shaft Seals 060x085x012,0 HPS060085012.0HP
Sevanit Shaft Seals 060x085x012,5 PS060085012.5P
Sevanit Shaft Seals 065x090x012,0 HPS065090012.0HP
Sevanit Shaft Seals 070x095x012,0 HPS070095012.0HP
Sevanit Shaft Seals 075x100x012,0 HPS075100012.0HP
Sevanit Shaft Seals 080x105x012,0 HPS080105012.0HP
Sevanit Shaft Seals 080x105x012,5 PS080105012.5P
Sevanit Shaft Seals 085x110x012,0 HPS085110012.0HP
Sevanit Shaft Seals 085x110x012,5 PS085110012.5P
Sevanit Shaft Seals 090x115x012,0 HPS090115012.0HP
Sevanit Shaft Seals 090x115x012,5 PS090115012.5P
Sevanit Shaft Seals 095x120x012,0 HPS095120012.0HP
Sevanit Shaft Seals 100x130x014,0 HPS100130014.0HP
Sevanit Shaft Seals 100x130x016,0 HPS100130016.0HP
Sevanit Shaft Seals 110x140x014,0 HPS110140014.0HP
Sevanit Shaft Seals 110x140x016,0 HPS110140016.0HP
Sevanit Shaft Seals 120x150x014,0 PS120150014.0P
Sevanit Shaft Seals 120x150x016,0 HPS120150016.0HP
Sevanit Shaft Seals 130x160x014,0 HPS130160014.0HP
Sevanit Shaft Seals 130x160x016,0 HPS130160016.0HP
Sevanit Shaft Seals 140x170x014,0 PS140170014.0P
Sevanit Shaft Seals 140x170x016,0 HPS140170016.0HP
Sevanit Shaft Seals 150x180x014,0 PS150180014.0P
Sevanit Shaft Seals 150x180x016,0 HPS150180016.0HP
Sevanit Shaft Seals 160x190x014,0 PS160190014.0P
Sevanit Shaft Seals 160x190x016,0 HPS160190016.0HP
Sevanit Shaft Seals 170x200x014,0 PS170200014.0P
Sevanit Shaft Seals 170x200x016,0 HPS170200016.0HP
Sevanit Shaft Seals 175x205x016,0 HPS175205016.0HP
Sevanit Shaft Seals 180x215x016,0 PS180215016.0P
Sevanit Shaft Seals 180x215x018,0 HPS180215018.0HP
Sevanit Shaft Seals 180x215x018,0 HP HNBR 86-071S180215018.0HP HNBR
Sevanit Shaft Seals 180x215x018,0 PS180215018.0P
Sevanit Shaft Seals 180x215x018,0 P HNBR 86-071S180215018.0P HNBR
Sevanit Shaft Seals 190x225x016,0 PS190225016.0P
Sevanit Shaft Seals 190x225x018,0 PS190225018.0P
Sevanit Shaft Seals 190x225x018,0 P HNBR 86-71S190225018.0P-1
Sevanit Shaft Seals 200x235x016,0 PS200235016.0P
Sevanit Shaft Seals 200x235x018,0 HPS200235018.0HP
Sevanit Shaft Seals 200x235x018,0 P HNBR 86-71S200235018.0HP-1
Sevanit Shaft Seals 210x245x016,0 PS210245016.0P
Sevanit Shaft Seals 210x245x018,0 HPS210245018.0HP
Sevanit Shaft Seals 210x245x018,0 HP HNBR 86-71S210245018.0HP-1
Sevanit Shaft Seals 220x255x018,0 HPS220255018.0HP
Sevanit Shaft Seals 230x265x016,0 PS230265016.0P
Sevanit Shaft Seals 230x265x018,0 HPS230265018.0HP
Sevanit Shaft Seals 240x275x016,0 PS240275016.0P
Sevanit Shaft Seals 240x275x018,0 HPS240275018.0HP
Sevanit Shaft Seals 240x275x018,0 HP HNBR 86-71S240275018.0HP-1
Sevanit Shaft Seals 245x270x018,0 PS245270018.0P
Sevanit Shaft Seals 250x285x016,0 PS250285016.0P
Sevanit Shaft Seals 250x285x018,0 HPS250285018.0HP
Sevanit Shaft Seals 260x300x018,0 PS260300018.0P
Sevanit Shaft Seals 260x300x020,0 HPS260300020.0HP
Sevanit Shaft Seals 260x310x018,0 PS260310018.0P
Sevanit Shaft Seals 260x320x018,0 PS260320018.0P
Sevanit Shaft Seals 270x310x018,0 PS270310018.0P
Sevanit Shaft Seals 270x310x020,0 HPS270310020.0HP
Sevanit Shaft Seals 280x320x018,0 PS280320018.0P
Sevanit Shaft Seals 280x320x020,0 HPS280320020.0HP
Sevanit Shaft Seals 280x320x020,0 PS280320020.0P
Sevanit Shaft Seals 290x330x018,0 PS290330018.0P
Sevanit Shaft Seals 290x330x020,0 HPS290330020.0HP
Sevanit Shaft Seals 300x340x018,0 HPS300340018.0HP
Sevanit Shaft Seals 300x340x020,0 HPS300340020.0HP
Sevanit Shaft Seals 310x350x020,0 HPS310350020.0HP
Sevanit Shaft Seals 315x365x020,0 HPS315365020.0HP
Sevanit Shaft Seals 320x360x018,0 PS320360018.0P
Sevanit Shaft Seals 320x360x020,0 HPS320360020.0HP
Sevanit Shaft Seals 330x370x020,0 HPS330370020.0HP
Sevanit Shaft Seals 340x380x018,0 PS340380018.0P
Sevanit Shaft Seals 340x380x020,0 HPS340380020.0HP
Sevanit Shaft Seals 350x390x018,0 PS350390018.0P
Sevanit Shaft Seals 350x390x020,0 HPS350390020.0HP
Sevanit Shaft Seals 355x405x020,0 HPS355405020.0HP
Sevanit Shaft Seals 360x400x018,0 PS360400018.0P
Sevanit Shaft Seals 360x400x020,0 HPS360400020.0HP
Sevanit Shaft Seals 370x410x018,0 PS370410018.0P
Sevanit Shaft Seals 370x410x020,0 HPS370410020.0HP
Sevanit Shaft Seals 380x420x020,0 HPS380420020.0HP
Sevanit Shaft Seals 390x430x020,0 HPS390430020.0HP
Sevanit Shaft Seals 400x440x018,0 PS400440018.0P
Sevanit Shaft Seals 400x440x020,0 HPS400440020.0HP
Sevanit Shaft Seals 400x450x018,0 PS400450018.0P
Sevanit Shaft Seals 400x450x020,0 HPS400450020.0HP
Sevanit Shaft Seals 410x460x025,0 HPS410460025.0HP
Sevanit Shaft Seals 420x470x022,5 PS420470022.5P
Sevanit Shaft Seals 420x470x025,0 HPS420470025.0HP
Sevanit Shaft Seals 430x480x022,5 PS430480022.5P
Sevanit Shaft Seals 430x480x025,0 HPS430480025.0HP
Sevanit Shaft Seals 440x490x022,5 PS440490022.5P
Sevanit Shaft Seals 440x490x025,0 HPS440490025.0HP
Sevanit Shaft Seals 450x500x022,5 PS450500022.5P
Sevanit Shaft Seals 450x500x025,0 HPS450500025.0HP
Sevanit Shaft Seals 460x510x022,5 PS460510022.5P
Sevanit Shaft Seals 460x510x025,0 HPS460510025.0HP
Sevanit Shaft Seals 470x520x022,5 PS470520022.5P
Sevanit Shaft Seals 470x520x025,0 HPS470520025.0HP
Sevanit Shaft Seals 480x530x022,5 PS480530022.5P
Sevanit Shaft Seals 480x530x025,0 HPS480530025.0HP
Sevanit Shaft Seals 490x540x022,5 PS490540022.5P
Sevanit Shaft Seals 490x540x025,0 HPS490540025.0HP
Sevanit Shaft Seals 500x550x022,5 PS500550022.5P
Sevanit Shaft Seals 500x550x025,0 HPS500550025.0HP
Sevanit Shaft Seals 510x560x022,5 PS510560022.5P
Sevanit Shaft Seals 510x560x025,0 HPS510560025.0HP
Sevanit Shaft Seals 520x570x025,0 HPS520570025.0HP
Sevanit Shaft Seals 530x580x022,5 PS530580022.5P
Sevanit Shaft Seals 530x580x025,0 HPS530580025.0HP
Sevanit Shaft Seals 540x590x022,5 PS540590022.5P
Sevanit Shaft Seals 540x590x025,0 HPS540590025.0HP
Sevanit Shaft Seals 550x600x025,0 HPS550600025.0HP
Sevanit Shaft Seals 560x600x018,0 PS560600018.0P
Sevanit Shaft Seals 570x620x022,5 PS570620022.5P
Sevanit Shaft Seals 570x620x025,0 HPS570620025.0HP
Sevanit Shaft Seals 580x630x025,0 HPS580630025.0HP
Sevanit Shaft Seals 590x640x018,0 PS590640018.0P
Sevanit Shaft Seals 590x640x025,0 HPS590640025.0HP
Sevanit Shaft Seals 600x650x025,0 HPS600650025.0HP

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