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Back Up Rings

Back up rings are essential sealing components designed to support O-rings in high-pressure applications, helping to prevent extrusion and extend seal life. Commonly used alongside hydraulic and pneumatic sealing systems, a back up o ring provides additional stability to an O-ring when operating under demanding pressure conditions. Whether used as a single back up o ring support component or as part of a complete sealing assembly, these rings improve sealing performance, reduce wear and help maintain reliable system operation across industrial environments. Swan Seals supplies a range of high-quality back up o ring solutions suitable for a variety of applications and operating conditions.

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Back Up Rings

What are Back Up Rings?

A back up ring is a rigid sealing support component installed alongside an O-ring to prevent the elastomer seal from extruding into clearance gaps under pressure. In high-pressure systems, O-rings can deform or become damaged without additional support, which is where a back up o ring solution becomes essential. Typically manufactured from PTFE, NBR, or other durable materials, back up rings help improve sealing reliability, reduce maintenance requirements and extend the lifespan of sealing systems. O ring back up ring combinations are widely used in hydraulic cylinders, valves, pumps and other pressurised equipment where dependable sealing performance is critical.

Types of Back Up Rings

There are several types of back up ring available to suit different sealing applications and operating environments. Common options include spiral PTFE back up rings, solid PTFE rings, contoured back up rings and machined back up rings for specialised sealing requirements. Spiral designs offer easy
installation and flexibility, while machined variants provide precision sealing support in demanding industrial systems. Swan Seals also supplies rod back-up rings, piston back-up rings and symmetrical back-up rings designed for hydraulic and pneumatic applications. Selecting the correct back up o ring configuration depends on pressure levels, media compatibility and system design requirements.

Applications for Back Up Rings

Back up rings are commonly used in hydraulic, pneumatic, oil
and gas, manufacturing and heavy engineering industries where systems operate under high pressure. An o ring back up ring arrangement is often found in hydraulic cylinders, pumps, valves, compressors and industrial machinery to prevent seal extrusion and improve sealing efficiency. PTFE back up rings are particularly popular in applications involving aggressive chemicals, high temperatures and demanding operating conditions due to their excellent wear and chemical resistance. By supporting the primary O-ring seal, back up rings help reduce downtime, improve equipment reliability and increase seal longevity in critical industrial systems.

Choosing the right Back Up Rings

Choosing the correct back up ring depends on factors including operating pressure, temperature, media compatibility, clearance gaps and the type of O-ring being used. For high-pressure hydraulic systems, PTFE back up o ring solutions are often preferred due to their strength and resistance to extrusion. In other applications, contoured NBR back up rings may provide improved flexibility and sealing support. It is also important to ensure the back up ring matches the O-ring size and gland design to achieve optimal sealing performance. Swan Seals offers a comprehensive range of back up rings for o rings products and specialist sealing solutions to suit a wide variety of industrial and engineering applications.