To ensure the perfect seal, a long-lasting seal that you can trust to prevent fluids and gases from escaping&#;. not any type of o ring will do.
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There is a lot of consideration that must go into choosing the right o ring for the application for which it is intended.
For example, material type is significant, as each material will have advantages and disadvantages, making it suitable for only certain environments.
If you&#;re looking to buy O-rings and have questions or require further information on which type of o ring would be most suitable, speak to a member of the SSP team today on 274 776, we&#;re happy to help.
O rings are designed to ultimately prevent leaks from occurring. O rings are available in various shapes and sizes and are designed to meet specific application requirements.
Working with the right o ring helps to keep applications operating smoothly.
Designed to sit within the groove and be compressed between two mating parts to form a tight seal, o rings are used in all industries across a range of applications.
Cost-effective and easy to install and maintain, o rings may be small, but they perform a vital role.
O rings are ideal for hydraulic applications as they can provide a tight seal in varying temperature, pressure, and tolerance situations.
They&#;re also lightweight, require little space, and can be reusable depending on material choice.
Available in various shapes and sizes, in hydraulics, o rings seal the connections as they are positioned and held in place by the hydraulic pressure &#; preventing leaks and stopping contaminants from entering the hydraulic system.
Measurements &#; size matters with o rings, and as such, you will need to take into account the inside and outside diameter of the o ring as well as the cross-section. Diameters can vary significantly, and this must be built into decision-making as some space will be required to account for swelling and thermal expansion.
Note: O rings should not be stretched more than 5% because this can lead to the cross-section of the o ring flattening.
You must choose the most appropriate cross section to avoid extrusion and tearing and to ensure the perfect seal.
There are various types of materials which o rings can be manufactured from; these include:
Nitrile (Buna N) is the most common material for o rings and is often paired with quick-acting couplings. An all-around great seal with excellent resistance to hydraulic fluids, Nitrile o rings perform best in temperatures ranging from 45 to 250 degrees Fahrenheit. These o-rings are predominantly found in oil, gas, and water applications. Note: Nitrile is not good when faced with ozone or sunlight but is resistant to compression, tear, and abrasion. NBR is the most common choice in hydraulic applications.
EPDM is a material best suited to the medical industry and automotive sector (within waste and water systems), as this type of o ring is resistant to most chemicals, heat, water, and steam and can withstand harsh environmental conditions.
FFKM &#; this type of metal ring gasket is not only strong but incredibly dependable. Offering users a long lifespan, the material FFKM is resistant to extreme temperatures, pressure variances, and a range of chemicals.
Fluorocarbon (Viton) &#; o rings manufactured in this material will be used in applications that face extreme temperatures and chemicals. Resistant to ozone, oxygen, and oils, this material is a suitable O-ring material for hydraulic fluid. In addition, increasing the fluorine content in FKM will also increase the o ring resistance to chemicals.
Silicone &#; odourless, non-toxic, and suitable in temperature ranges from 70 to 400 degrees Fahrenheit, this o ring type is most suitable for medical devices, food storage products, electronics, and specific automotive applications.
VMQ &#; resistant to ozone and weather. This is a flexible material for o rings; however, it has low tensile strength and is susceptible to wear. It is not usually a good material of choice as a hydraulic o ring.
When looking for an o ring for your application, it&#;s essential that you choose the right one.
You need to be aware of the pressure and operating temperature range that the o ring will be subject to, as the sealing capability of the o ring can be compromised if the o ring is exposed to conditions beyond what it can withstand.
For example, if the pressure is too high, you may experience some extrusion of the o ring and lose material through wear, leading to seal failure.
To combat these challenges, a backup ring that fits between the o ring and the extrusion gap may be used.
O rings are a very small part of a much larger hydraulic system; however, they are also a part that is critical to overall performance, so choosing the right one is critical.
If you&#;re unsure or have any questions, call us at 274 776 or your requirements to .
Everybody likes o-rings. What? You don't? Well, you may not like o-rings, but if you work in this business, I bet you use them all the time. I have found over the years that all techs follow more or less the same "evolutional pattern" in regards to the ubiquitous o-ring seal. I want to share my observations (note that these observations are only valid for "classic" hydraulics - i.e. mineral oil and industrial temperature and pressure ranges):
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The starting point for all hydraulic techs:
O-rings are doughnuts molded from rubber that seal the gaps between surfaces so that our beloved hydraulic oil stays confined.
Evolution in regards to
1) O-ring material? Is this even a thing? All o-rings are made from rubber, aren't they?
2) There are "normal" o-rings and "high temperature" o-rings. Also - very important - green o-rings should be replaced with green o-rings and black o-rings should be replaced with black ones.
3) Viton, FPM, and FKM are the same thing!
4) Just read bout the synthetic rubbers used for o-rings. Damn! ACM, CSM, EPDM, FPM, FEPM, CO, ECO, BR, NBR, SBR, XNBR, FMQ... I'll stop now.
5) You know what? I think I'll go back to categorizing my o-rings as normal (NBR) and high-temperature" (Viton) o-rings.
1) O-ring hardness? Is this even a thing? Aren't all o-rings the same?
2) There are "hard" o-rings and "soft" o-rings.
3) There's actually this thing called shore-A hardness scale, and the o-rings that I used to call "hard" are 90-shore, and "soft" are 70-shore. Who could have thought?!
4) Saw my first durometer today. Such an interesting contraption!
5) Just read about harness of things. Damn! Aside from Shore-A, there are also B, C, CF, D, E, DO, M, OO, OOO, OOO-S, and RR. I'll stop now.
6) You know what? I think I'll go back to categorizing my o-rings as "soft (shore-70)", "hard(shore-90)", and "in-between" (shore-80-ish)!
1) Sizing? Easy! Just put one o-ring next to another and keep comparing them till you find one that kind of looks the same...
2) I learned to use a caliper, and I know that o-rings are sized by their cross-section and internal diameter.
3) It is much easier to measure grooves than o-rings (that is - when you have access to the respective grooves). And then choose o-rings that are a "tiny bit " fatter than the groove width.
4) Just read an o-ring groove sizing manual. Damn! Static sealing, dynamic sealing, recommended o-ring squeeze, recommended gland fill, concentric and diametric clearances, hardness vs pressure, and clearance gap... I'll stop now.
5) Just learned about o-ring size standards. Apparently, manufacturers and various international organizations, in their attempt to standardize o-ring sizes, managed to create a "standard mess" that can only be compared to (and, possibly, surpassed by) the standards for fastener threads.
6) You know what? I'll do my best to stick to standard cross sections our supplier stocks and uses the most (possibly the AS568) for my designs and choose standard sizes for my orders. Also, 15% squeeze and 75% fill is a good enough ballpark for most of my applications.
Now let me explain my point - if you use o-rings all the time, and by "use" I mean - not taking o-rings from a seal kit, but finding yourself in a situation where you need to determine the correct size for an o-ring (or an o-ring+ back-up seal combination) so that you could order a correct replacement, you can't solely rely on a "gut feeling" that tells you to use a "tiny-bit fatter than the groove o-ring".
Educate yourself about o-ring/groove size recommendations and standard sizes - and you'll see that choosing and ordering o-rings becomes a lot easier, and you'll also learn that a lot of o-rings that you require all the time (or that come in OEM seals kits) are, actually, standard. For example, the NG06 (CETOP 3) interface o-ring is the AS568 number 12, or those o-rings for the ORFS fittings - AS568 numbers 11, 12, 14, 16, 18...
This is why I uploaded the standard o-ring sizes table last week - to be able to check if an o-ring I am looking for belongs to a certain standard. Why? Because standard o-rings are easier and cheaper to source. Also - asking suppliers for standard sizes usually results in faster quotes.
Now, with the fast-changing internet, I don't want to place links to resources that may disappear tomorrow. But what you can do (if you haven't done this already) is Google for things like "o-ring handbook", "o-ring groove design guide" and, maybe "standard o-ring size chart" - and you will find tons of good usable info provided by seal-selling companies and OEMs. Tons!
So, I guess this post should be considered as something along the lines of "I dare you to learn something new about this because it's important and good for you".
What? You know everything about o-rings? Can you tell me what the Joule Effect is? No? It's time to go and search for that handbook then...
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