Sep. 25, 2024
Nitrile Butadiene Rubber (NBR, nitrile)
NBR, also known as nitrile rubber or nitrile, is the most popular material for an oil seal because of its good resistance to many oils and greases, such as mineral grease and hydraulic oil. Depending on their composition, synthetic oils and greases, such as those based on glycol, can damage NBR rubber materials. Depending on the amount of glycol, a PTFE lip seal may be the best choice. NBR is also unable to cope with contact with acids and solvents. The rubber is suitable for oil and grease at temperatures from -35 °C to 100 °C.
Most ERIKS oil seals, such as the types M, MST, R and RST, are made of NBR as standard.
Fluorine rubber (FKM, Viton™)
FKM or FPM, which is in well-known brand Viton™, can withstand higher liquid temperatures of up to 180 ˚C. FKM is highly resistant to strong acids and bases, as well as to synthetic oils and greases. Glycol-based oil and grease, however, can also damage FKM.
Because of the higher temperature resistance of FKM, this material is also chosen for applications where higher speeds play a role, which raise the temperature at the sealing lip considerably. Usually, using FKM will result in a longer life than using NBR. This compensates the higher price of FKM compared to NBR, as an FKM does not have to be replaced as frequently. The low temperature resistance of standard FKM is limited to -15 ˚C.
Polytetrafluoroethylene (PTFE, Teflon®)
PTFE, which is used in the well-known brand Teflon®, is less commonly used, but it is the preferred material for specific rotating seals in the chemical, food and pharmaceutical industries. This material is notable for having a very low frictional resistance and the best chemical resistance. It can also withstand a very wide range of temperatures in these types of seals; -80 ˚C to 200 ˚C. The shafts on which oil seals with PTFE lips are used require a harder and finer finish. Something like an axle sleeve can also be used to meet this requirement.
EPDM
EPDM oil seals are less common. They are used in solvent, hot water and steam applications, EPDM resists low temperatures down to -50 °C and UV radiation well. Some types of EPDM are also suitable for higher temperatures up to +150 °C. EPDM oil seals are usually available upon request.
VMQ (silicone)
VMQ, also known as silicone, is also used for oil seals, but this is less common because the mechanical strength of VMQ is low and this material has poor wear-resistance This makes it less suitable for dynamic applications, but it can withstand fairly low and high temperatures from -60 °C to 200 °C. Many types of VMQ are also suitable for contact with pharmaceutical and food products, so VMQ is an option worth considering. VMQ oil seals are usually available on request.
Oil seals work by squeezing and retaining lubricant in a thin layer between the lip and the shaft. Perfect sealing is ensured by the hydrodynamic action of the rotating shaft, which in turn produces a slight pump action.
As earlier said, oil seals perform some functions that ensure the functionality of mechanical equipment and extend their lifespan. And how they do this is by retaining lubricants at all cost and not making them escape no matter how high the pressure of the machine is.
The other way oil seals work is by stopping outboard materials that can damage the machine or contaminate its lubricant. The outboard materials that the oil seal will need to stop depend on the application. However, the most common kinds are dirt, moisture, and the particles produced during manufacturing.
Standard petroleum oil has a lifespan of 30 years at 86 degrees Fahrenheit if it’s not
contaminated with moisture or any other particle. But the same oil will only last for a month at 212 degrees Fahrenheit if it’s contaminated with little water. This is why the function of an oil seal is very evident whenever it’s used.
Oil seals work by squeezing and retaining lubricant in a thin layer between the lip and the shaft. Perfect sealing is ensured by the hydrodynamic action of the rotating shaft, which in turn produces a slight pump action.
As earlier said, oil seals perform some functions that ensure the functionality of mechanical equipment and extend their lifespan. And how they do this is by retaining lubricants at all cost and not making them escape no matter how high the pressure of the machine is.
The other way oil seals work is by stopping outboard materials that can damage the machine or contaminate its lubricant. The outboard materials that the oil seal will need to stop depend on the application. However, the most common kinds are dirt, moisture, and the particles produced during manufacturing.
Standard petroleum oil has a lifespan of 30 years at 86 degrees Fahrenheit if it’s not
contaminated with moisture or any other particle. But the same oil will only last for a month at 212 degrees Fahrenheit if it’s contaminated with little water. This is why the function of an oil seal is very evident whenever it’s used.
Machines play a crucial role in keeping our world functioning efficiently. We depend on them heavily to ensure that everything runs smoothly. This dependence often leads us to concentrate on the larger parts of these machines. However, we should recognize the smaller yet vital components like oil seals. These seemingly minor parts are key to maintaining a machine’s efficiency. Oil seals keep lubricants inside the machinery as protectors and block out harmful contaminants. Their straightforward but essential function is vital for the seamless operation of our machines.
That’s why choosing proper sealing for a railcar component, an automobile, or a heavy type of machinery helps keep them running properly without any failures. And that’s where the magic of measuring and understanding different oil seals typescomes in. It’s not just about picking any seal; it’s about finding the perfect fit for your needs.
So, let’s dive into this blog to understand how to measure and select the ideal oil seal for your machinery.
Oil seals, also known as shaft seals or lip seals, are critical components in machinery used to seal pressurized systems, maintain lubricants, and exclude contaminants. These seals are often made of nitrile rubber, silicone, or polytetrafluoroethylene (PTFE), providing the flexibility and durability needed to keep a tight seal under varying conditions. An oil seal has a metal casing to keep it firm and a sealing lip to prevent fluid loss.
They are frequently used in automotive, industrial, and manufacturing applications, critical to machine smooth and efficient operation. Elements such as the material’s compatibility with the fluid and the temperature range of the seal determine the efficacy of oil seals.
1.Rotary Shaft Seals: These seals protect bearings from impurities and prevent lubrication leakage in rotating machinery parts. They guarantee that the machine’s moving components run smoothly and last long.
2.Hydraulic Seals: Hydraulic seals are often used in hydraulic cylinders and designed for high-pressure settings. They protect fluid systems by preventing fluid leakage at excessive pressure.
3.Axial Seals: Axial seals are important components in pumps and valves since they are used largely for axial motions. They offer excellent sealing in applications where pieces move parallel to the seal axis.
4.Static Seals: These types of seals are Ideal for circumstances when the sealing pieces move very little or at all. Static seals keep a seal in place while stationary, avoiding leakage in fixed joints.
5.Custom Seals: When regular seals fail to suit the unique needs of a particular application, custom seals are the go-to answer. They are custom-made to match specific dimensions and circumstances, producing excellent sealing performance.
Understanding these oil seals types is essential to choose the perfect one for your machines.
The accuracy of measuring oil seals is paramount. Here’s a step-by-step guide:
-Inner Diameter (ID): To determine the seal’s inner diameter, measure across its interior. This ensures the seal can adequately fit onto the shaft it’s designed to protect.
– Outer Diameter (OD): To find the seal’s outer diameter, measure across the exterior of the seal. This dimension is critical for ensuring the seal fits appropriately within the hole or housing in which it is installed.
These dimensions are critical for ensuring the seal fits securely and efficiently in its intended location, resulting in maximum performance and protection.
Simply measure the width of the seal from one edge to the other. This width ensures the seal fits correctly in its allotted housing area. This dimension must be correct for the seal to function effectively and offer the necessary protection.
Determine whether the seal has a single or double lip. This feature is significant because it affects how the seal works against the surface it is sealing. A single lip is easier, and seals in basic settings; on the other hand, a double lip seal provides enhanced protection and is better suited for demanding environments where extra sealing is necessary. Numerous reputable suppliers of aftermarket parts in India offer high-quality oil seals for various needs.
Determine the seal’s substance, which might be nitrile, silicone, or Viton. The material determines how effectively the seal can withstand various temperatures and chemicals. Each material has strengths and is suitable for specific conditions, so choosing the right one is crucial for the seal’s effectiveness.
After measuring, you must select the appropriate type of seal for your needs. Bear in mind:
There are various oil seals types available to suit different needs, but selecting the appropriate oil seal is crucial for your machine’s performance.
Proper installation is just as important as selecting the appropriate seal. Here are some basic guidelines to follow:
Many top rubber products manufacturers in India now make user-friendly oil seals, frequently including installation guidelines. However, it is still advisable to have professionals perform the inspections and repairs to ensure everything is done correctly.
Inspection and replacement of worn oil seals are critical for preventing leaks and contamination in machinery. Consider the operational environment, as severe temperatures might accelerate wear. Adhering to a standard replacement plan and preserving maintenance records increases equipment lifespan and dependability.
Read More – Things you should know before buying rubber oil seals .
Understanding how to measure and select the properoil seals is critical for maintaining the integrity and performance of machinery. A good oil seal does more than just prevent leaks and keep out contaminants; it also helps extend the life of your machinery, reducing the need for repairs and avoiding costly downtime. Investing time in selecting the right seal is a smart move that pays off in the long run.
For high-quality oil seals and rubber products, Sujan Industries is your go-to answer. We offer a range of top-notch products tailored to meet your specific needs. Known for their quality and commitment to excellence, contact our expertsfor durable and practical sealing solutions.
When maintaining machinery, choosing the proper hydraulic oil seal is crucial. Whether you're a seasoned professional or a novice, these 8 essential steps will guide you. We'll cover everything from selection to installation and maintenance. So, let's dive in and ensure your equipment operates at its best.
Selecting the Perfect Hydraulic Oil Seal
Selecting the proper hydraulic oil seal is the first step to ensure your machinery's longevity. Here's how to do it:
Understanding Your Machinery
Before you choose an oil seal, understand the type and specifications of your machinery. Check the manufacturer's manual for details.
Determine the Seal Material
Select the material of the oil seal based on the fluid type and temperature it will be exposed to. Common materials include Nitrile, Viton, and Polyurethane.
Measuring the Size
Accurate measurements are vital. Measure the shaft's diameter, the housing bore, and the width of the seal to ensure a proper fit.
Installation Matters
The installation process can significantly impact the performance of your hydraulic oil seal. Follow these steps for success:
Cleanliness is Key
Ensure that all components are free from dirt and debris. A clean environment is essential to prevent contamination.
Lubricate the Seal
Apply a thin layer of the appropriate lubricant on the seal to ease installation and prevent damage.
Proper Seating
Make sure the seal is correctly seated in the housing bore. Use a proper installation tool to avoid damaging the seal lip.
Regular Maintenance is a Must
Maintenance is the key to extending the life of your hydraulic oil seal. Here's what you need to know:
Inspect Regularly
Keep an eye on the seal for any wear, leaks, or damage. Early detection can prevent costly breakdowns.
Replacing Worn Seals
When you notice wear or damage, replace the hydraulic oil seal promptly to maintain efficiency.
Lubrication
Regularly lubricate the seal to reduce friction and extend its lifespan.
How to Choose the Right Hydraulic Oil Seal
Now, let's recap the 8 essential steps for choosing the proper hydraulic oil seal:
1. Understand your machinery's specifications.
2. Choose the appropriate seal material.
3. Accurately measure the size of the seal.
4. Maintain a clean installation environment.
5. Lubricate the seal during installation.
6. Ensure the seal is seated correctly.
7. Regularly inspect for wear and damage.
8. Replace worn seals and maintain proper lubrication.
Exploring the Common Causes of Hydraulic Oil Seal Wear, Leaks, and Damage
Over time, wear, leaks, or damage to these seals can occur, leading to decreased system performance and potential breakdowns. Understanding the common causes of hydraulic oil seal issues is essential for effective maintenance and prevention.
· Abrasive Contaminants: One of the primary culprits behind hydraulic oil seal problems is the presence of abrasive contaminants in the hydraulic fluid. Particles or abrasive substances can infiltrate the system and gradually wear down the seal material. This abrasive action can lead to seal wear and, ultimately, leaks.
· High Pressure: Hydraulic systems often operate under high pressure. Excessive pressure can cause the seal to deform or rupture, leading to leaks and potential damage to other system components.
· Temperature Extremes: Extreme temperatures, whether too hot or too cold, can affect the integrity of the seal material. Prolonged exposure to such conditions can cause the seal to become brittle, crack, or lose its sealing capabilities.
· Improper Lubrication: Adequate lubrication is crucial for reducing friction and ensuring the longevity of hydraulic oil seals. Inadequate or incorrect lubrication can increase conflict, accelerating the wear and tear on the seal.
· Shaft Misalignment: If the shaft and housing are not correctly aligned, it can create uneven pressure on the seal. This uneven pressure can lead to wear and potential leakage around the seal.
· Uneven Wear: Uneven wear on the seal can occur if the sealing lip is not in direct contact with the shaft or housing. Factors like misalignment or uneven pressure distribution can contribute to irregular wear.
· Chemical Compatibility: The hydraulic fluid's chemical composition is critical. Incompatible fluids or chemicals can have a corrosive effect on the seal material, causing it to degrade over time and lose its sealing properties.
· Incorrect Installation: Proper installation is paramount. If the seal is installed correctly, it can be protected during the process, leading to leaks or premature wear.
· Excessive Shaft Speed: High shaft speeds can generate heat and friction, accelerating wear on the seal. This is particularly important to consider in high-speed applications.
· Vibration and Shock: Hydraulic systems that experience frequent vibration or shock loads can put extra stress on the seal, causing wear and potential damage over time.
· Aging and Wear Over Time: Like any mechanical component, hydraulic oil seals naturally wear out with age and use. Over time, the seal's effectiveness diminishes, leading to potential leaks and decreased performance.
· Seal Material Quality: The quality of the seal material matters. Lower-quality materials may not withstand the demands of the hydraulic system, leading to premature wear and seal failure.
FAQs
Q: How often should I inspect my hydraulic oil seal?
Inspect your hydraulic oil seal regularly, at least every three to six months, depending on the operating conditions.
Q: Can I use any lubricant for the oil seal?
No, it's essential to use the lubricant recommended by the manufacturer for your specific seal material.
Q: What should I do if I notice a leak from the seal?
If you detect a leak, shut down the machinery, replace the seal, and investigate the cause of the leak.
Q: Are there any alternative materials to Nitrile, Viton, and Polyurethane for hydraulic oil seals?
Yes, there are various materials available, but Nitrile, Viton, and Polyurethane are the most common due to their versatile properties.
Q: How do I measure the shaft diameter accurately?
Use a reliable caliper or micrometer for precise measurements.
Q: Can I install the seal without any special tools?
While possible, it's highly recommended to use the appropriate installation tools to avoid damaging the seal.
Conclusion
Choosing the proper hydraulic oil seal is essential for machinery longevity. By understanding your equipment, selecting the appropriate material, and following proper installation and maintenance procedures, you can ensure smooth operation and prevent costly breakdowns. Remember the 8 essential steps and make your machinery work seamlessly.
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FOUNDED IN 1993
China SBT Oil Seal is an international company integrating design, research and development, production and processing.
No. 68, Hua'an Street, Renze District, Xingtai City, Hebei Province, China
+86 188 0309 4557
Won many honorary certificates through a number of patented inventions
