PTFE Backup Rings for High-Pressure Sealing Applications
Durable PTFE Backup Rings for Reliable Seal Support
PTFE Back-Up Rings are used to prevent seal extrusion under high-pressure conditions. They are available in solid or spiral PTFE designs, as well as 90 Shore hard NBR. Backup rings are generally recommended for pressures in excess of 100 bar or when a low-strength elastomer has been used.
By providing additional support to the primary seal or O-ring, PTFE backup rings help prevent extrusion into clearance gaps, improving sealing performance and extending the service life of critical components.
What Are PTFE Backup Rings?
A PTFE backup ring is a precision-engineered support ring installed alongside an O-ring or other elastomeric seal. Under high pressure, an O-ring can deform and extrude into the clearance gap between mating components. A backup ring provides mechanical support to help prevent this extrusion and maintain the integrity of the sealing system.
PTFE backup rings are available in several configurations, including solid backup rings and spiral backup rings, depending on the installation requirements and operating conditions.
Key Features and Benefits
- Prevents seal and O-ring extrusion under high pressure
- Recommended for pressures exceeding 100 bar
- Available in solid and spiral PTFE designs
- Also available in 90 Shore hard NBR
- Provides support when low-strength elastomers are used
- Excellent chemical resistance
- Low-friction performance
- Suitable for demanding industrial applications
- Helps extend seal and O-ring service life
- Available in standard and custom sizes
Applications of PTFE Backup Rings
PTFE and NBR backup rings are widely used in:
- Hydraulic cylinders
- High-pressure hydraulic systems
- Pneumatic applications
- Pumps and valves
- Oil and gas equipment
- Chemical processing equipment
- Industrial machinery
- High-pressure sealing systems
PTFE Backup Ring Types
Solid PTFE Backup Rings
Solid PTFE backup rings provide reliable support in applications where the ring can be installed during assembly. Their rigid construction helps resist seal extrusion in demanding high-pressure environments.
Spiral PTFE Backup Rings
Spiral PTFE backup rings are designed to make installation easier in applications where it may not be possible to disassemble the complete component. They provide effective anti-extrusion support while offering greater installation flexibility.
90 Shore Hard NBR Backup Rings
For applications requiring a harder elastomeric support material, 90 Shore hard NBR backup rings provide additional resistance to deformation and are suitable for a range of industrial sealing applications.
Custom PTFE Backup Rings
We supply PTFE backup rings in standard and custom sizes to meet specific sealing requirements. Our backup rings can be manufactured in different dimensions, materials, and configurations to suit your application.
Whether you require a solid PTFE backup ring, spiral PTFE backup ring, or 90 Shore hard NBR backup ring, we can provide a solution designed for reliable performance in high-pressure sealing applications.
Frequently Asked Questions
1. What is a PTFE backup ring?
A PTFE backup ring is a sealing support component used alongside an O-ring or elastomeric seal to prevent extrusion under high pressure. It supports the seal and helps improve the reliability and service life of hydraulic and industrial sealing systems.
2. When should a PTFE backup ring be used?
PTFE backup rings are generally recommended for applications operating at pressures exceeding 100 bar or when a low-strength elastomer is used. They are particularly effective where there is a risk of seal extrusion into clearance gaps.
3. What types of PTFE backup rings are available?
PTFE backup rings are available in solid and spiral designs. Solid backup rings are suitable for standard assembly applications, while spiral backup rings can make installation easier where complete disassembly is difficult. Backup rings are also available in 90 Shore hard NBR.
4. What are the advantages of using PTFE backup rings?
PTFE backup rings provide excellent anti-extrusion support, chemical resistance, low friction, and high-pressure performance. They help protect O-rings and seals from deformation, reducing wear and extending the overall service life of the sealing system.
5. Where are PTFE backup rings commonly used?
PTFE backup rings are commonly used in hydraulic cylinders, pumps, valves, oil and gas equipment, chemical processing systems, and other high-pressure industrial applications. They are an effective solution wherever seals require additional support to prevent extrusion.