A V-ring comprises a seal body, a flexible conical-shaped sealing lip, and an integral, resilient “hinge”. Once stretched, it is directly installed on the shaft, where the inherent tension of the seal body holds it in place. This allows it to rotate with the shaft, creating an axial seal against a stationary counterface.

The counterface may take various forms, including the end face of a bearing, a washer, stamping, bearing housing, or even the metal case of a radial shaft seal.

The flexible sealing lip applies a contact pressure against the counterface, which is relatively low but sufficient for maintaining the sealing function. In low-speed applications, the light contact pressure even permits the seal to run dry, resulting in minimal torque drag or heat build-up. The contact pressure varies based on the fitted width.

The flexibility of the lip and hinge ensures effective sealing, even in applications with significant end play and shaft misalignment.

Due to centrifugal force, the contact pressure of the lip decreases as speed increases. This minimises friction losses and heat, enhancing wear resistance and extending the service life. Power loss peaks at a shaft speed of approximately 12 m/s (2,360 ft/min) and gradually reduces up to 20 m/s (3,900 ft/min), where it eventually decreases to zero. At this point, the V-ring transforms into a gap-type seal and deflector.

V-Rings are mainly used in combination with other types of seals such as shaft seals and they are used as an upstream sealing element in bearing. V-Rings are used frequently in following:
Applications of V-Rings

1. Drive engineering
2. General engineering
3. Plant construction
4. Electric motors
5. Gears
6. Agricultural equipment
7. Bushing blocks
8. Rolling mills

The V-ring seal is meticulously fitted onto the shaft, employing a snug undersized fit that allows it to rotate seamlessly along with the shaft's movements. Its ingenious design ensures that the flexible sealing lip maintains a flush contact with the sealing surface, adeptly compensating for any tolerances or angular deviations that may be present.

This flexible sealing lip serves as a formidable barrier, effectively thwarting the ingress of liquids while providing robust protection against external dust and contaminants. By forming a tight seal, the V-ring seal not only safeguards the integrity of the machinery's internal components but also enhances operational efficiency and longevity.

V-rings are made entirely of elastomers without fabric or metal reinforcement and are therefore easy to install. They can be stretched and, depending on size, pushed over other components like flanges, pulleys or even housings. This is a very valuable feature, especially when replacing a seal.

V-rings are elastic and can be stretched and pushed over other components, which facilitates the installation (fig. 5). When several V-rings are to be installed, a simple tool († fig. 6) can be used to push the seals to their position at a predetermined distance from the counterface. V-rings can also be cut and rejoined in the field. The general installation guidelines include the following:

• Clean the V-ring, counterface and shaft.
• Make sure that the shaft is dry and free from grease or oil, particularly when installing a V-ring without axial support.
• Lubricate the lip of the V-ring with a thin film of grease or silicone oil.
• In applications where friction must be reduced to a minimum, the counterface should be coated with a low-friction agent. Do not apply
  grease to the lip.
• Check that the V-ring is installed with a uniform stretch around the shaft
• The V-ring ought to be expanded uniformly all over the circumference. It may be helpful, especially where large dimensions are concerned, to slide a round blunt auxiliary tool (made of POM or wood) between V-ring and shaft and to let it rotate several times around the shaft.
• It is important to uniformly keep the distance B after the installation. For more dettails see Figure 4 below

Sharp edges, nicks and burrs on the shaft must be avoided to prevent damage to the V-ring during installation. V-rings rotate with the shaft and only require a moderate surface roughness value. As a general guideline, the value should not exceed Ra 6,3 μm (252 μin.). When sealing fluids or exposed to fine, solid contaminants, the V-ring requires a surface roughness value of maximum Ra 3,2 μm (128 μin.). A V-ring is stretched when installed and fits all shaft diameters within the ranges listed in the product tables.

User benefits

1. Improved sealing system performance
2. Reduction in maintenance and failures caused
3. by contamination
4. More reliable system performance
5. Increased bearing service life
6. Increased uptime and productivity
7. Cost-effective solution
8. Optimised bearing protection

ADVANTAGES

1. diverse fields of application
2. no high requirements as regards the shaft and housing designs low friction
3. high circumferential speeds are possible as a result of reduced friction
4. relatively insusceptible to coaxiality and radial eccentricity
5. long service life
6. easy installatio

Common applications

1. Industrial electrical
2. Industrial gearboxes
3. Off-highway machinery
4. Material handling equipment
5. Mining and construction equipment
6. Steel manufacturing equipment
7. Pulp and paper processing equipment
8. Marine industry machinery
9. Wind turbines

Type VA Series

V-ring type VA with straight back serves as a pressureless axial rod seal with a very small mounting length, which is clamped on the shaft.
The flexible sealing lip seals a counter face at a right angle to the shaft preventing dirt, dust and splash to enter the construction. The type VA is designed for heavy use or is applied in situations where larger axial tolerances are required. This profile is delivered for shafts from Ø 450 to Ø 2010 mm

Type VS Series

V-ring type VS with bevel back serves as a pressureless, axial rod seal which is clamped on a shaft. The flexible sealing lip seals a counterface at a right angle to the shaft, preventing dirt, dust and splash to enter the construction.

Type VL Series

V-ring type VL with straight back serves as a pressureless axial rod seal with a very small mounting length, which is clamped on the shaft.
The flexible sealing lip seals a counterface at a right angle to the shaft preventing dirt, dust and splash to enter the construction.