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The U-ring has a symmetrically configured seal lip for single - or double-acting standard cylinders of piston rods or pistons. The U-shaped sealing ring is a sealing ring that acts as a seal. Because its cross-section is U-shaped, it is called U-ring, the English name U-ring.
U-shaped sealing ring is used for hydraulic, transmission, cylinder and other reciprocating movement of the
single acting seal, with the following characteristics:
1.Balanced seal, sealed inside and outside diameter, with support ring protection seal to prevent squishing or twisting.
2.Seal into the slot, lips shall not contact the pressure ring, the use of self-tightening principle for sealing.
3.Hydraulic cylinder for piston rod or piston.
4.The section shape is U-shaped, which can be used for outer circle sealing and inner circle sealing.
5.Used in chemical, oil, electric power and other industrial fields.Why Buna (Nitrile) U-Rings?
Buna, scientifically referred to as Nitrile Butadiene Rubber (NBR), is a synthetic rubber copolymer of butadiene and acrylo nitrile. Buna-based U-RINGS ,o-rings, Backup Rings, X-Rings, and Square Rings have earned their place as the preferred choice in numerous applications due to their unique balance between flexibility, resistance, durability, and affordability.
This balance positions Buna o-rings as a stand-out choice for various demanding industrial applications. As a leading provider, Global O-Ring and Seal understands the crucial role of these components and is committed to offering superior quality Buna-based products to cater to diverse industry needs.
Applications of Buna (Nitrile) U-Rings
Given their exceptional properties, it's no surprise that Buna U-rings find application across various industries, including automotive, aerospace, oil and gas, agriculture, and food processing.Automotive Industry
In the automotive industry, Buna U-rings are integral to the overall operation of various vehicle systems. Their excellent resistance to petroleum-based oils and fuels makes them ideal for use in fuel and oil systems. They maintain tight seals even under high pressures and temperatures in these settings. Commonly, they are in fuel injectors, oil seals, fuel pumps, and carburetors. Their ability to withstand high temperatures also sees them used in the heat-intensive environment of engines, specifically in areas such as gaskets and cooling systems.Aerospace Industry
The aerospace industry heavily relies on Buna U-rings, especially in fluid power systems that demand excellent resistance to compression set and a wide operating temperature range. Buna U-rings ensure leak-free operation under the most challenging conditions, a vital aircraft safety and efficiency requirement. Moreover, Buna's resistance to a range of aircraft fuels, hydraulic fluids, and lubricating oils makes it an excellent choice for this sector.Oil and Gas Industry
The demanding environment of the oil and gas industry also leverages the strengths of Buna U-rings. They are used extensively in drilling equipment, pumps, valves, and other downhole tools. These applications demand seals that perform under extreme pressures and temperatures. With their excellent resistance to oil-based fluids, Buna u-rings are perfect for such applications, reducing the risk of leaks and expensive downtime.Agricultural Industry
In the agricultural sector, Buna u-rings find their way into various equipment such as tractors, irrigation systems, and harvesting equipment. In tractors, they're in hydraulic systems, fuel lines, and cooling systems. Buna U-rings also prove vital in irrigation systems, especially those that use fertilizers or other chemicals, due to their resistance to many agricultural chemicals. The substantial temperature variations typical in this sector pose no problem for Buna u-rings.Food Processing Industry
Another industry where Buna U-rings are essential is the food processing industry. The material's resilience, durability, and resistance to a wide variety of oils and fats make it an ideal choice in this sector. They are found in numerous applications, from processing equipment to storage and transportation systems, ensuring safe and hygienic handling of food products.
U-Rings are available in the following elastomers:Aflas® or Kalrez®(FFKM)
Acrylate Rubber(ACM)
Butyl Rubber(IIR)
Ethylene-propylene (EPR, EPDM)
Ethylene Acrylate Rubber(AEM)
Fluorocarbon (FKM/FPM)
Fluorosilicone(FVMQ)
Hydrogenated Nitrile (HNBR)
Liquid Silicone Rubber(LSR)
Neoprene Rubber(CR)
Nitrile Rubber (Buna-N/NBR)
Natural Rubber(NR)
Polyurethane(PU)
Silicone Rubber Styrene-butadiene Rubber (SBR)
Different elastomers have different compatibility with various chemical elements and their characteristics. See the table below for more material knowledge to order the most cost-effective o-rings from us.Material Hardness
(Shore A)Temperature
(ºC)Main Color Advantage Price Level Shelf Life
(Years)NBR / Nitrile / Buna-N 60-90 -40 - 120 Black Good oil resistance & low price Low 5-10 HNBR / HSN 60-90 -40 - 150 Green Suitable for the cooling industry High 5-10 FKM / FPM 70-90 -20 - 200 Brown High-temperature & chemical resistance High About 20 EPDM / EPR 50-90 -50 - 150 Black Excellent weather & ageing resistance Fair 5-10 VMQ / Silicone 40-80 -70 - 220 Red High-temperature & FDA food grade High About 20 Neoprene / CR 50-90 -40 - 120 Black Versatility Properties Fair 5-10 FFKM 70-90 -10 - 320 Black Excellent chemical & high-temperature Highest About 20 FVMQ / Fluorosilicone 40-80 -60 - 200 Blue Wider operating temperature range High About 20 Aflas / FEPM 40-90 -2 - 230 Black Good chemical compatibility Higher About 20 PU / polyurethane 60-90 -40 - 90 Natural High strength and wear resistance High About 10
We have certificates :ISO 9001:2015 , ISO 14001:2015 ,ISO 45001:2018 , IATF 16949 , FDA, REACH, ROHS, SGS etc.
1. Since 2006, focus on rubber seals, especially for auto parts
2. Certificates: ISO9001, IATF16949, ISO14001, ISO45001,ISO 13485
3. Two factories, more than 18000M2,clean room 600M2, with 300 workers.
4. Molds > 10000 sets, especially o rings, about 5000 sets.
5.O-ring series covers American standard (AS568), Japanese standard (JIS), national
standard(GB), and produces a large number of customized non-standard parts.
6. Material: NBR, FKM, SIL, EPDM, CR, NR, PU, HNBR, FFKM, SBR .The rubber materials
used meet the requirements of ROHS2.0 and REACH235.
7. Material Certificates: FDA, ROHS, REACH, UL157, CP65 WRC, EN549,EN45545.
8. Products are widely used in automotive parts, electronic connectors, valves, pneumatics,
power tools, new energy, medical equipment, electronic products and other fields.
Design
Mold Making
Samples Testing
Mass Production
Proceed with mass production strictly according to the confirmed samples. Deliver the finished products to the customer via express shipping worldwide.
Ruichen always meets our customers' requirements. To make sure we produce high-quality o-rings, our company implements the
following general standards:
1) Raw material incoming inspection standard ASTM D2000 & HG/T 2579-2008 & HG/T 2811-1996
2) Public o-ring dimensional tolerance GB/T 3452.1-2005
3) N-level specification for o-ring appearance quality inspection GB/T 3452.2-2007
4) Hardness measurement model Micro O-Ring Testing (Type M system)
5) Hardness using standard ASTM D2240 Rubber Standard Test Method (Shore A)
6) Sampling inspection specification GB/T2828.1-20
Ruichen company have cooperated with many superior customers as below , we have complete system and excellent productivity
to serve for you
Why RUICHEN?
Many big companies select RUICHEN for their rubber seals and customized rubber parts because we always
satisfy them in quality, price, delivery, service, etc. At the same time, we also attach great importance to the
small customers in niche markets.Whether your purchase quantity is big or small, you are our valuable partners.
High Quality
We continue to manufacture high-quality products for all customers and pursue 100% customer satisfaction,
which has become one of our core competencies.
Profession
We have rich experience in materials, products, and production and excellent international trade and language
communication skills.
Best Services
From quoting, sampling, production, and shipping to after-sales, our sales will provide you with the best service
so that you can rest assured completely.
10000+ Projects Delivered
Over 10K projects have been sent to our customers worldwide in recent years, and we have received countless
positive comments.
Low Price
Our customers can obtain maximum profits through the ISO management system and intelligent manufacturing
to reduce our costs continuously.
Massive Capacity
Our in-house facilities allow us to get your projects done fast. And thanks to our strong relationship with rapid
materials partners, our capacity is not limited.
Fast Delivery
Unlimited capacity, experienced engineers, and a flexible production system allow us to create your seals and
production parts in a short period.
1000+ Happy Customers
We aim to keep every customer happy with reliable quality, fast turnaround, and excellent services. We want all
our new customers to become long-term customers.
We can also produce Automotive Rubber Seals ,Connector Rubber Seals ,Power Tool Rubber seals ,Valve Rubber Seals ,Pipe Rubber Seals ,Semiconductor Rubber Seals ,Hydraulic Pneumatic Rubber Seals ,Pump Rubber Seals ,Oil and Gas Seals ,Food Grade Rubber Seals ,Medical Rubber Seals ,Chemical Equipment Rubber Seals ...etc.
FAQ
Q: 1 What kinds of materials can you provide?
A: NBR, EPDM, SILICONE,FKM(FKM),NEOPRENE(CR), HNBR ,NR, IIR, SBR, ACM, AEM,Fluorosilicone(FVMQ),
FFKM etc.
Q: 2 How to select the raw compound for my application?
A: With years of experience working with a variety of material, we can help select the material that will best suit your
needs while keeping material costs in mind.
Q: 3 How long can we get the quote?
A: If your information is complete, we will provide the quotation within 8 hours.
Q: 4 Can you provide samples? Is it free or extra?
A: Yes, we can provide samples for free. Freight can be negotiated.
Q: 5 What is the normal lead time for product orders?
A: If the stock generally takes 3-7 days, mold about 15-18 days, no mold about 25-30 days, depending on the product
situation.
Q: 6 How to check the quality of the bulk order?
A: We have incoming inspection, control the quality of raw materials, process inspection,to ensure the quality of the
production process, shipping 100% of the full inspection; automatic inspection machine full inspection, and according
to customer needs before the mass production of pre-production samples.
Q: 7 What is your standard packing?
A: Plastic bag for inner packing .carton box for outer packing also be packed according to customer's requirements.
Q: 8 What's the payment term?
A: We accept T/T 30% deposit and 70% balance , Paypal is also ok.
