? 1. Definition of V-ring

V-ring is a fully rubber flexible sealing element, which is installed on the rotating shaft, and the sealing lip is attached to the surface of the stationary mating part (such as the bearing cover or end cover), so as to achieve the functions of dustproof, waterproof, oil-proof and impurity-proof.

✅ English name: V-ring seal

✅ Classification: Rotating shaft seal

? 2. Structure diagram and working principle

V-ring generally consists of three parts:

Mounting Body: installed on the shaft and rotates with the shaft;

Flexible Hinge: makes the sealing lip elastic;

Sealing Lip: contacts the stationary surface to form a seal.

? Working principle:

When the shaft rotates, the V-ring also rotates with the shaft;

The sealing lip gently fits on the stationary metal surface;

Centrifugal force + elastic fitting force jointly prevent contaminants from entering the bearing or sealing cavity.

Typical size range

Shaft diameter range: from 3mm to 2000mm

Standards are in accordance with ISO 611 or manufacturer's own standards (such as Freudenberg, SKF)

? 5. Material selection

Material Features Temperature range Application environment

NBR Oil-resistant, general purpose -40°C ~ +100°C Industrial standard scenario

FKM (Viton) High temperature resistance, chemical corrosion resistance -20°C ~ +200°C Petrochemical, high temperature motor

EPDM Water vapor resistance, ozone resistance -50°C ~ +150°C HVAC, water pumps, etc.

?️ 6. Installation instructions

Sleeve directly on the shaft and keep the position by the self-tightening force of the rubber;

The sealing lip end faces the pollution source (such as external dust and water);

Can be used with other seals (such as skeleton oil seals) to improve multi-stage sealing performance.

? VII. Typical application areas

Motor bearing seals

Gearboxes, fans, pump shafts

Wind turbines, compressors

Food machinery, dustproof fan seals

✅ VIII. Advantages summary

Advantages

✔ Easy installation without special tools

✔ Low cost

✔ Good sealing effect (especially dustproof)

✔ Long service life

✔ Adapt to shaft eccentricity or slight runout