Also known as grease seals, rotary shaft seals, or fluid seals, oil seals play a pivotal role in mechanical equipment. They are often overlooked because they are a small part of the machine, but when these oil seals fail, the consequences can be huge, like seal leakages that are costly to fix.
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From assembly machines to car engines, oil seals prevent any harmful damage from occurring, which is why you must choose the right oil seal with the highest quality. There are many kinds of oil seals, all of which have several uses.
This article will guide you through the most common factors you should look for when buying oil seals to help you choose the right one for the machinery you’re working on.
Improper installation and poor-quality oil seals are some of the reasons that pieces of machinery get damaged. When choosing an oil seal, consider the following factors.
The temperature range of the seal elastomer should match the temperature range of where you’ll install the seal. For example, high-temperature and high-pressure environments need more durable rubber, like Viton. If the oil seal is exposed to extreme temperatures outside of the elastomer’s range, the sealing lip may harden, break, and crack.
The oil seal’s material matters, as it can determine how well it performs depending on its use. Sealing elements can come in leather, silicone, synthetic rubber, Viton, nitrile, and polyacrylate. Nitrile is good for general purposes, as it’s flexible and resistant against oils, hot water, and gasoline. However, it doesn’t do well in extremely high temperatures. Meanwhile, silicone oil seals lessen wear and tear by absorbing lubricants. They have a wide temperature range and high thermal resistance, too.
Understanding the compression requirements of your components is important. Most ordinary oil seals are designed for very low-pressure applications (about 8 psi or less). If the intended application has high pressure, you should consider choosing an oil seal ideal for high pressure or changing to a pressure-free structure.
The oil seal shouldn’t suffer from spiraling or abrasions. As such, you should consider the maximum allowable shaft speed, runout, type of oil seal material, type of fluid being sealed, and housing bore and shaft concentricity before buying an oil seal.
Close shaft and bore tolerances should be present if you want the best seal performance. It would be best to consider the shaft’s vibration, eccentricity, and end play.
You must align bore and shaft centers because misalignment can shorten the oil seal’s life cycle due to the excessive wear concentrated on only one side of the sealing lip.
It would be best if you kept runout to a minimum. When the center of rotation moves, it’s usually caused by a shaft whip or bearing wobble. When you add misalignment, then you’ll face a greater problem. Contrary to common practice, installing flexible couplings won’t correct misalignment, which is why you need the right oil seal to prevent all these issues from arising.
The quality of the oil seal affects its service life. The higher the quality, the longer the lifespan, reducing wear and tear and increasing your ROI through lower maintenance costs. While wear and tear issues are inevitable, you should mitigate them by using materials that last long. Here, the first step to ensuring quality oil seals is purchasing from a reputable oil seal supplier.
When shafts have a Rockwell (RC) hardness of 30 or more, you can expect the oil seal to have a longer seal life. For shafts exposed to more abrasive contamination, your oil seal should handle RC 60.
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You can tell that you have effective sealing if the shaft surface finish is in excellent condition. Sealing performance is greatly influenced by the spiral lead and the direction of the finish tool marks.
You’ll get the best sealing results when the shafts are ground or polished with concentric (no spiral lead) finish marks. If the shaft can’t help but have spiral finish leads, they should lead toward the fluid when the shaft rotates.
Oil or lubricants play a significant role in improving the oil seal’s performance. You should choose a lubricant compatible with the seal lip elastomer material and the right viscosity for the application. Incompatible lubrication can result in the wearing out of the oil seal.
An example of a lubricant you can use is Permatex Anti-Seize Lubricant, a highly refined blend of graphite, aluminum, and copper lubricants.
Oil seals come in various sizes, styles, and materials. Hence, it can be challenging to pick the right type for your needs. Use the factors above to guide you throughout your oil seal selection process. If you’re looking for top-of-the-line oil seals, Simplex is a premier distributor of oil seals and premium industrial and engineering parts in the Philippines. Visit our shop today to get started!
If you deal with rotatory shaft equipment, you would probably be having rubber seals in your mechanical assembly. For any manufacturing company, optimal functionality, efficiency, and long service life are essential to your success in the market. A component that is majorly underappreciated within a machine assembly, would be oil seal.
Shaft seals are used to prevent lubricant leaks like oil or grease and protect machinery from dirt, dust, and water—which makes them invaluable to industrial operations. In this post, we will dive deeper into oil seals and discuss everything that one must know, such as what it is, how it works, types, applications, and what to keep in mind when buying oil seals.
Rubber oil seals are placed between moving and static parts of mechanical equipment to prevent damage caused by moisture, contaminants, etc. Also known as rotatory shaft seals, grease seals, fluid seals, lip seals, and dirt seals; oil seals play an important role in closing the gaps between moving and stationary parts of machines.
Their main purpose is to retain or separate fluids from mixing and escaping the gauge, as well as stop moisture, abrasives, corrosive materials, and foreign contaminants from entering the parts, thereby ensuring maximum machine efficiency. Moreover, shaft rubber seals help prevent lubricant leakage at high pressure, for instance, when the machine is working at an extremely high pace.
Oil seals work by retaining lubricant in a thin layer between the lip and the shaft. These seals are attached to the bearing, with their lip pressing against the rotating shaft and the casing resting against the housing to hold the seal in place.
Oil seals perform some functions that ensure functionality at all costs and they do this by retaining lubricants at all costs and not making them escape no matter how high the pressure is. Whenever an oil seal fails, it creates seal leakage allowing abrasives, corrosive moistures and sediments to enter machines. Oil seals are especially used in equipment that has rotating, oscillating, and reciprocating shafts – pumps, pistons, etc.
Different types of seals offered by rubber products manufacturers in India include – Single and double lip oil seals, metal cased, external and internal oriented oil seals, and spring-energized oil seals and you can pick the one that best suits your industry requirements.
Practically, all machine equipment including assembled machines, car engines, and PTFE machined parts use these oil seals to prevent harmful interactions that could possibly result in damaged parts. They are used in the assembly of Elevators, conveyor belts, engines, grinding mills, pipelines, wind turbines, and more.
When equipment is under high pressure, lubricants tend to escape, and dry parts clash. Oil seals help prevent this by sealing holes where lubricants can leak out. rubber seals are designed to offer optimum sealing performance and extreme durability even under high-peripheral speed. They are lightweight, compact, and exhibit high self-lubricating properties. Oil seals are manufactured with high-grade materials and last long without showing any signs of hardening, softening, or aging.
Moreover, oil seals are widely used throughout the aerospace industry in both space exploration and aviation applications. Sujan Industries manufactures all aircraft rubber items including O-rings, Gaskets, Seals, Pistons, Grommets, Washers, and Protective Boots & Bellows. In the aviation sector, pneumatics and hydraulics are used to operate components like landing gear and wing flaps. Rubber gaskets are needed in these systems to keep dust and air out while ensuring aircraft components run effectively.
Picking the right type of oil seals is crucial for the proper functioning of machines because in some situations not all types can fit to work on certain machines.
There are quite a few factors to put into consideration when you’re choosing the right oil seal for your machine. Some of these factors include – dimensions, pressure, temperature, type of fluid, lubricant, shaft speed, shaft and bore tolerance, and more.
The capacity of oil seals to handle different intensities of pressure varies with their composition and application, so it is important to understand the compression set of your equipment. Just like the pressure, the temperature that your oil seal will be operating in must be known to be able to choose one that can withstand the working temperature.
Likewise, different types of fluids like grease, water, oil, fuels, etc. will come into contact with oil seals. So, knowing what type of fluids will be in constant contact with oil seals will help you choose the one capable of withstanding the surrounding conditions. When we talk about lubricants, seals always perform well when lubricated, however, in some machines there are dry spells. If you are a supplier of aftermarket parts in India or a user looking for oil seals in the aerospace industry, your search might end with Sujan Industries.
Oil seals are critical to a machine’s functionality. A machine’s oil seals are critical to its functionality. Picking the right seal for your machine is vital as it not only guarantees the optimum performance of applications but also ensures a safe working environment for years to come. With so many rotary shaft seal options available, it can be hard to know which one to choose for your machine! Contact us today to speak to one of our experts and pick the best one for you.
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