V-RING - VA - NBR 60 55

Product description:

• V-rings are axial seals produced from a mould
• The stiffening element, "hinge" and sealing lip represent the typical construction of a V-ring
• The time-consuming disassembly of shafts and other parts often makes it necessary to use cut V-rings
• These V-rings are vulcanised or glued during assembly
• For special applications, among others, V-rings can also be mounted in an applied groove with a tensioning strap

Types:

• V-rings are classified according to their different profiles
• The following types are available:
  • VA Standard version
  • VS With reinforced stiffening element
  • VL With thin profile for small installation spaces, e.g. for labyrinth seals
  • VE For large diameters

Standard material:

• Elastomeric sealing element:
  • NBR 60 black
  • FKM 60 brown (FKM 70)

  Applications:

  • V-rings are mainly used in combination with other seals such as oil seals and are applied as a protective sealing element in bearings
  • V-rings are often used in drive technology and mechanical engineering
  • V-rings are also found in electric motors, gearboxes, agricultural machinery, bearing blocks and rolling mills
  • They are used to seal off dust, dirt, grease, oil and water splashes
  • In case of more severe conditions, we recommend using our VRM01 and VRM02 types.
  • These versions feature a metal housing to protect the sealing lip

  Function:

  • The V-ring serves as a dirt-dust seal
  • The V-ring is stretched on the shaft and should be mounted rectangularly with a precisely defined distance to the metal raceway to ensure axial preload of the sealing lip
  • The face of a bearing, the face of a housing or, for example, a flange, serves as the running surface
  • The V-ring rotates with the shaft and seals axially on the running surface
  • With increasing rotational speed, the centrifugal force causes the sealing lip to move outwards, thus reducing the pressure with which the lip presses on the running surface
  • From a certain rotational speed, the sealing lip completely detaches from the metal tread
  • The V-ring then acts only as a gap seal

  Advantages of the V-ring:

  • Simple sealing
  • Seal against dust, dirt, grease, oil or water splashes
  • Easy to use in combination with oil seals
  • Makes few demands on the running surface with regard to surface quality
  • Easy assembly - is stretched on the shaft
  • Friction decreases with increasing rotational speed due to centrifugal force
  • Good dynamic sealing function
  • Compensates minor axial movements
  • Protects oil seals against dirt

Medium:

• NBR: good chemical resistance to many greases and mineral oils
• FKM: mineral oils and greases, synthetic oils and greases, engine, transmission and ATF oils, motor fuels, aromatic and chlorinated hydrocarbons, good resistance to chemicals and solvents

Operating parameters:

• Pressure: suitable for non-pressurised applications
• Temperature (°C): NBR -40 to +100, FKM -20 to +200

Rotation speed (m/s):

• NBR = 8; axially guaranteed from 8; Radially guaranteed from 12
• FKM = 6.5; axially guaranteed from 6.5; radially guaranteed from 10

Construction tips regarding the tread:

• The V-ring runs against a rectangular tread applied to the shaft, e.g. a flange or the front of a bearing housing
• The tread should be a finely machined surface
• The surface roughness should be max. Ra=2.0 (sufficient for many applications)
• The tread should not be hardened
• Under more severe conditions such as coarse dirt, a large amount of sand, coarse-grained sand, a minimum hardness is preferable
• The hardness in this case should be chosen depending on the medium to be sealed and the tread material used
• Parts made of sprayed or cast alloys of light metal and formed steel sheets can serve as treads without additional processing
• However, there must be no surface defects and faults, e.g. sharp edges, burrs, cast blows, undulations, unevenness and/or damage