High-Quality China Rubber V-Ring Seal Manufacturer & Supplier
Savvy specializes in precision-molded NBR/FKM rubber V-Ring seals or gaskets with standardized profiles (VA/VAX/VS/VE/VL/VLX/RM/RME), manufactured under ISO 3601-3 tolerances. Our rigorous quality control and axial space-optimized designs ensure 12,000+ hour service life in demanding conditions from -40°C to 200°C.
What is V-Ring?
V-Ring is a unique all-rubber seal ring for rotary shafts and is a perfect seal to prevent dirt ingress, dust, water, oil or the development of a combination of these media, while actively retaining grease.
V-Ring seals can be widely used in bearing equipment due to their unique design and performance. It can also be used as a secondary seal to protect the main seal from working properly in harsh environments.
The V-Ring seal is usually stretched by utilizing the inherent elasticity of rubber and then clamped directly on the shaft. It rotates with the shaft, generating a centrifugal force. The rubber matrix itself can become a side wall or gasket, which can well protect the bearing housing and even the oil seal of the metal housing. The sealing lip is flexible and elastic, suitable for occasions with relatively low contact pressure, and can generally maintain good sealing performance. Low contact pressure allows the lip to be used under certain dry friction conditions. Due to the influence of centrifugal force, the contact pressure of the lip increases with the increase in speed, which means that friction loss and heat are kept at a small value, thus achieving excellent wear performance and extending the seal life.
The flexible lip of the V-Ring seal allows a certain amount of axial runout and eccentricity and is easy to install. The V-shaped ring can be stretched and installed on flanges, pulleys and bearing seats according to size, which can save expensive removal costs. In addition, some v-ring seals are fixed to the end cover or shaft by bolts or clamping bands.
V-Ring Types (Styles)
There are eight primary types or styles of V-rings, including VA, VAX, VE, VS, VL, VLX, RM, and RME.
V-Ring seals offer multiple standard cross-sectional designs to meet diverse installation space and application requirements. Some types adjust their cross-sectional dimensions proportionally with shaft diameter increases to ensure consistent sealing performance, while others maintain fixed cross-sectional profiles across broad diameter ranges. Select the appropriate model based on shaft diameter, rotational speed, media type, and spatial constraints to maximize sealing efficiency and equipment longevity.
VA Type Shaft Sealing Ring
As the most widely used standardized product, the VA series features a straight-back design that achieves a compact profile, requiring approximately 30% less axial installation space compared to the VS series. With an ultra-wide inner diameter range of 2.5–1,810 mm and compatibility with shaft diameters ranging from 3 to 1,000 mm, its exceptional sealing performance and short axial installation length make it ideal for gearboxes, drive motors, and industrial transmission systems in small-to-medium equipment. It holds over 60% market share in its category.
VAX Type Heavy-Duty Sealing Ring
Engineered for high-load applications, the VAX series employs a reinforced rubber compound and thickened cross-section design to withstand 40% higher radial loads than standard models. Its inner diameter range of 4–180 mm (compatible with 5–180 mm shafts) incorporates a unique stress distribution structure to counteract centrifugal effects in large bearings operating above 3,000 rpm. It is primarily used in demanding environments such as wind turbine main shafts and high-speed machine tool spindles.
VE Type Extra-Large Diameter Sealing Ring
Designed for heavy industrial equipment, this all-rubber sealing solution accommodates shaft diameters of 300–2,000 mm. Its multi-layer composite lip design ensures uniform stress distribution across ultra-long circumferences, while optional 304 stainless steel clamping bands provide auxiliary axial fixation. It is widely deployed in marine propulsion shafts, mining rotary kilns, and other mega-scale rotating components requiring long-term sealing against seawater or abrasive particulates.
VS Type Dynamic Sealing Ring
Featuring an innovative tapered-back design, the VS series increases contact area by 25% compared to the VA type, delivering stronger radial sealing force. With an inner diameter range of 4–180 mm (suitable for 5–199 mm shafts), its wear-resistant formulation and contamination resistance excel in harsh environments with sand, dust, or debris. Typical applications include agricultural machinery (tractor drive shafts) and commercial vehicle hubs.
VL Type Compact Sealing Ring
Utilizing a patented narrow-profile straight-back design, the VL series reduces axial space requirements by 50% compared to standard models. With an inner diameter range of 99–540 mm (compatible with 110–1,200 mm shafts), its modular configuration integrates seamlessly with labyrinth seals. The flexible edge design tolerates 0.5–1.5 mm radial runout, making it a critical solution for precision equipment such as industrial robot joints and medical CT scanner gantries where ultra-thin sealing interfaces are essential.
VLX Type Ultra-Compact Sealing Ring
Building on the VL series, the VLX type introduces a revolutionary 0.8mm ultra-thin cross-section, achieving 65% axial space reduction versus conventional designs. Its inner diameter spans 20–400 mm (for shafts 25–450 mm), with a dual-lip configuration enhancing sealing redundancy. The fluorosilicone compound enables operation at -50°C to 200°C, ideal for aerospace actuators and semiconductor wafer handling robots where micron-level space constraints exist.
RM Type High-Temperature Sealing Ring
Specifically formulated with peroxide-cured FKM rubber, the RM series withstands continuous 250°C exposure and peak temperatures of 300°C. Its spiral reinforcement grooves maintain seal integrity during thermal expansion, compatible with shaft diameters of 10–500 mm. Widely adopted in industrial furnaces, turbocharger bearings, and pyrolysis equipment, it provides exceptional resistance to thermal cycling and hot media leakage.
RME Type Chemically Resistant Sealing Ring
An advanced variant of the RM series, the RME incorporates PTFE-embedded composite lips for unmatched chemical compatibility (resisting acids, alkalis, and hydrocarbons up to 230°C). Its dynamic sealing edge features laser-engraved microchannels for lubricant retention, extending service life in aggressive environments. Designed for 15–600 mm shafts, it is mandatory in chemical processing pumps, pharmaceutical reactors, and oil refinery valve stems requiring FDA/REACH compliance.
V-Ring Materials
The most commonly used materials for rubber V-Rings are nitrile/NBR and FKM/Viton. And the hardness (durometer) of NBR and FKM rubber is generally 60 Shore A. HNBR, EPDM, and PTFE are rarely used in some special scenarios.
1. NBR – Excellent oil resistance, good elasticity, suitable for mineral oil, grease, and other media, the working temperature is generally -40℃～100℃. Widely used in the seals of automobiles, bearings, pumps, and other equipment, and is a common material for V-type water seals (such as VA type, VL type).
2. FKM/Viton – High temperature resistance (up to 200℃), strong chemical corrosion resistance, suitable for harsh media such as synthetic oil, acid, alkali, etc. Used for water seals in high temperature or chemical corrosion environments (such as VA type, VL type).
3. HNBR – Hydrogenated and modified based on NBR, the temperature resistance is significantly improved (-40℃～150℃), while retaining excellent oil resistance, and stronger oxidation resistance and chemical corrosion resistance. Suitable for sealing scenarios with higher temperatures or chemical environments, such as high-temperature oil pressure equipment, chemical pumps, etc.
4. EPDM – Outstanding water and steam resistance, temperature resistance range -40℃～150℃, suitable for non-oily media such as water and air. Used for sealing in water treatment equipment or humid environments.
Depending on the different material, it can be used in the following working conditions:
Speed: ≤19m/s; Pressure: ≤40MPa; Temperature: -40℃～+200℃; Medium: mineral oil, air, water, emulsion, grease, etc.
V-Ring Sizes
Our V-Ring catalog features eight standardized styles (VA, VAX, VS, VE, VL, VLX, RM, RME) with many part numbers for diverse industrial applications. Dimensions are precision-engineered in millimeters without inches but are also suitable in US and UK, with shaft compatibility spanning 3mm to 2,000mm. The V-Ring size chart details cross-sectional widths (0.8–35mm) and axial space requirements (1.2–42mm) by series. Critical numerical ranges include VLX seals for compact 25–450mm shafts and VE types for heavy-duty 300–2,000mm systems. Match shaft diameter, speed, and environmental needs to the size chart for optimal sealing performance.
Optimize seal performance with precise dimensional matching. Below are key sizing parameters, design, and selection guidelines for the V-Ring types:
| Types | Shaft Range (mm) | Inside Diameter (mm) | Outside Diameter (mm) | Height (mm) |
V-Ring Advantages
- All rubber elastomer material without metal parts.
- Reduced design work, no installation and processing requirements.
- Eliminated the requirements for shaft matching surface processing and surface accuracy and hardness, and the shaft surface does not need to be hardened.
- Simple installation and disassembly, convenient and reliable.
- Small surface contact pressure and small friction, less friction loss and friction heat, long service life.
- Has both sealing and dustproof functions.
V-Ring Selection
Five Key Selection Criteria to Choose the Right V-Ring Seals:
1. Shaft Diameter Match – Measure precisely and cross-reference with series specifications (e.g., VA: 3–1,000mm, VLX: 25–450mm).
2. Material Compatibility – NBR: oil/grease resistance (-40°C to 100°C) for hydraulic systems; FKM: chemical/heat resistance (-20°C to 230°C) for chemical pumps or engines.
3. Dynamic Requirements – Select VAX for high-speed (>3,000 rpm) or RM/RME for extreme temperatures (>200°C).
4. Axial Space Constraints – Choose VA/VL for tight spaces (mounting length <5mm).
5. Environmental Factors – Pair with PTFE backup rings in abrasive/particle-laden environments.
V-Ring Seal Installation
To install rubber V-Rings correctly, start by cleaning the shaft surface thoroughly to remove dirt or debris. Apply a thin layer of silicone-free grease to the sealing lip for lubrication. Slide the V-ring onto the shaft using a tapered plastic sleeve (avoid metal tools) and align its V-shaped opening toward the pressurized side (static seals) or opposite the rotation direction (dynamic seals). Ensure the seal sits evenly without overstretching—gentle hand rotation should confirm smooth contact. For multi-seal setups, use alignment tools to maintain spacing. Finally, perform a low-speed test run (≤500 rpm for 10 minutes) to check for leaks or uneven wear.
Need custom solutions? Our engineers specialize in hybrid designs (V-ring + labyrinth) for extreme ±5mm axial play.