How Do You Choose an O Ring?

When installing a pressure sensor, especially on units with parallel threads, such as BSP, UNF etc, it is necessary to use an O ring on the external face of the hexagon mounting face to ensure complete sealing.


It is important to choose the right sealing gasket to give long-life performance. Several factors must be taken into consideration when you choose an O ring, including compatibility with the fluid under test, the temperature range of the application, mounting torque, size, pressure ranges etc.


There are many types of seals on the market, from gaskets in copper, lead, Viton, nitrile, Teflon etc. The following are some of the more commonly used seals.


Viton O Rings

Viton O rings are oil resistant and are capable of operating in temperatures between -15 and +200°C.


Teflon O Rings

Teflon O rings have similar properties to Viton, but are used for pressure ranges above 500bar (7000psi).


Dowty Bonded O Rings

Dowty bonded O rings are versatile but relatively expensive. They comprise a metal annulus to which a medium nitrile elastomeric ring of trapezoidal section is bonded. Dowty bonded O rings are commonly used with hydraulic fluids or mineral-based engine lubricating oils. Temperature range is -30 to +110°C, and maximum pressure is 1500bar.


Nitrile O Rings

Versatile and economical, nitrile O rings are suitable for temperatures from -40 to +110°C, and are resistant to mineral hydraulic oils, greases and certain chemicals. Nitrile O rings are available in imperial and metric sizes.


In addition there are now many different adapter ranges available that have built-in seals. Alternatively there is the option of choosing a thread that self-seals or has a cone sealing arrangement, such as Swagelock, -3 fitting etc.


Need more information about O rings? Do not hesitate to visit the professional manufacturer of vehicle and mechanical oil seals – Lian Yu Oil Seal Enterprise Co., Ltd.


You can find high quality oil seals, rubber parts, bonded seals, swivel kits, o rings, and much more products at Lian Yu. Feel free to send inquiry or contact them directly to get further details.



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Oil Seals: The Mark of a Well Oiled Machine

While they are often called many different names, oil seals, grease seals, fluid seals, and dirt seals all accomplish the same task: they have the very important job of closing the spaces between stationary and moving parts in all kinds of mechanical equipment. For everything from automotive, industrial, and agricultural equipment to manufacturing equipment and machine tools – oil and grease seals are an absolute necessity in the modern world when it comes to attaining the level of performance and efficiency that helps provide us with the many vehicles, products, and services we benefit from every day.


The very vital components of all kinds of bearings, from angular contact bearings to cylindrical roller bearings are all protected by oil seals, to keep their precisely constructed assemblies safe and reliable at all times – in even some of the harshest applications.


In addition to actually closing the spaces and gaps in various machines, tools, and vehicles, grease seals also provide critical protection against harmful contamination. With the help of oil seals, what needs to stay in the machine (such as lubrication) does so, and what needs to stay out of the machine (dirt, debris, and other contaminants) is kept away from its hardworking and often-delicate parts and components.


Simultaneously and specifically in the case of machine tools and machine components, oil seals do much more than prevent the ingress of abrasives, moisture, and contaminants. They also ensure that various liquids do not mix together, such as oil based lubricants and water.


There are many grease oil seal designs engineered specifically to meet the needs of various industries. While it might seem like “a seal’s a seal” the actual design, materials, and configuration used can make a significant difference in certain applications. For example, some seal types are engineered to eliminate torque and friction, this enables the seal to move with the bearings and the other machine components while simultaneously protecting against contamination. Other seal varieties are engineered with greater efficiency in mind. Regardless of the requirement, the industrial world has come up with a number of designs and concepts to deliver the performance needed for virtually every application. Some of these seal types include:


  • Light duty deals
  • Heavy duty seals
  • O-ring seals
  • V-seals
  • Labyrinth seals
  • Multiple lip seals
  • And more…


Whether you’ve ever even considered oil and grease seals before. They have undoubtedly affected your life and the things you use every day. So next time you think about how all the things surrounding you are manufactured – consider the impact of one tiny component: the oil seal.


Lian Yu specializes in the design, production and distribution of oil seals and special seals for vehicle and mechanical applications. Our product lines include bus oil seals, oil bath seals, industrial oil seals, special seal, rubber seals, vehicle oil seals, etc. If you have any interest or question, please do not hesitate to contact Lian Yu Oil Seals.


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Oil Seals

In terms of an oil seal, there are a lot of different types. Depending on how they are constructed, U-ring oil seals as well as block vee rings can be used as a rod seal, a piston seal or even a symmetric seal. U-rings and block vee rings are called single acting seals, also known as unidirectional seals, and have to be mounted back to back in cylinder applications that are double acting.

A Block Vee seal is really more compact and performs better under high pressure conditions than a U ring does. V ring seals are made of all rubber and are primarily used to get rid of dirt and other types of contaminants. V rings are stretched over a shaft and sealed against the side of housing or another type of machine component. Besides, more oil seals are introduced as there are several different kinds of clearance seals, also known as labyrinth seals. The one feature they all share with each other is that they all work on a principle of positive clearance. This means that there isn’t any rubbing that occurs against the shaft or the housing.

A lot of labyrinth seals are made up of a rotor, which rotates, and a stator, which is static, piece with a radial gap between the two pieces. The gap has to be bigger than the radial clearance of the bearing that is being sealed. Also, the operating speeds as well as the temperature have to be considered when utilizing a labyrinth seal. These kinds of seals typically don’t perform very well at lower operating speeds.

Another type of labyrinth seal is a laminar sealing ring, which utilizes a series of flat metal rings, similar to washers, of different diameters to make a labyrinth seal. Bearing isolators are a dynamic kind of seal that is designed to keep bearings protected from outside elements. They are also made up of a rotor, a rotating piece, and a stator, or static member. Some bearing isolators are made out of labyrinth construction but others use O rings or other kinds of positive seals.

More about oil seals and check it out now!

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Oil Seal Manufacturer- ASA

ASA Oil Seal is a company specializes in manufacture of oil seals for European cars, U.S. tractors, agricultural machinery and more. Other oil seal series include special oil seal, bonded to the sealing lip oil seal, PTFE oil seal, painted OD oil seal, V-seal, high pressure end cap oil seal, low pressure end cap oil seal, and polyurethane U packing oil seal. ASA will provide free ASTM 2000 elastomer test reports and provide free slabs and bottons for your independent testing. Let ASA becomes your most reliable oil seals manufacturer.

ASA Oil Seal

ASA Oil Seal


ASA Oil Seals Co., Ltd.

Address: No. 87-6, Nanshing St., Sanhe Tsuen, Fushing Shiang, Changhua Hsien, Taiwan
Tel: +886-4-7701111
Fax: +886-4-7700011
Contact Person: Luke Shu