01
Determining the Cause of Failure
First, check the pressure, clearance, eccentricity, and motion status to determine whether to add a single support ring or whether both the groove and the seal need to be adjusted simultaneously.
HIGH-PRESSURE ANTI-EXTRUSION
Anti-extrusion ring
Hold the O-ring in place,High-Pressure Sealing Stability
Select the material and structure of the support ring based on pressure, clearance, medium, and operating conditions; begin by analyzing the root causes of failure to ensure that seal life, system pressure, and maintenance intervals remain within controllable limits.
Up to 700 barPTFE / Nylon / POMInner diameter: 4–500 mm
CHALLENGES FACED
Have you encountered these issues when working with high-pressure seals?
High-Pressure Extrusion: O-rings are forced into the clearance, resulting in scoring, chipping, and leaks—and repeated failures as soon as pressure is applied?
Too Short a Service Life: If you only replace the seals, the clearance and structural issues remain, leading to an increase in replacement frequency and downtime costs?
Pressure Fluctuations: Could a mismatch between material, thickness, or assembly orientation and operating conditions lead to reduced pressure-holding capability and affect equipment accuracy?
CHENGSYIN ADVANTAGES
Choosing the Right Anti-Extrusion Ring: Start with the Causes of Failure
Chengxin helps you resolve high-pressure sealing issues once and for all by verifying every detail—from failures and operating conditions to manufacturing processes and documentation.
WHY CHENGSHIN
6 Key Advantages of Chengxin Anti-Extrusion Rings
From failure analysis to delivery documentation—all handled through a single point of contact.
02
Material-Media Matching
Select the appropriate solution from PTFE, filled PTFE, nylon, and POM based on temperature, medium, pressure, and dynamic load.
03
Verification of Standard Specifications
Check the inner diameter, outer diameter, thickness, opening type, and groove specifications to ensure the part fits properly and can withstand the pressure.
04
Custom sizes manufactured according to drawings
Custom sizes can be evaluated for manufacturing based on drawings, samples, or groove specifications, to support repairs, replacements, and new equipment design.
05
Confirmation of Structure and Thickness
Depending on whether the design calls for single- or double-sided support, an open or full-ring configuration, confirm the thickness and assembly method to ensure it’s installed correctly the first time.
06
Delivery Schedule and Document Consolidation
By coordinating the confirmation of reference samples, special processing schedules, and material and quality documentation, we ensure that procurement and maintenance progress remains under control.
PRODUCT TYPES & MATERIALS
Decide on the structure first, then choose the materials
When considering anti-extrusion rings and O-rings, as well as grooves and clearance fits, Chengxin determines the ring type, opening, and material based on the direction of pressure, dynamic and static conditions, and available installation space.
STEP 01
Determine the structure first
Select the ring type and configuration based on the direction of pressure and the assembly method.
01
Open-Ended Support Ring
To facilitate assembly, maintenance, and replacement, verify the opening configuration, pressure direction, and clearance simultaneously.
Confirm Receipt of Previous Item →
02
Full-Circle Anti-Extrusion Ring
Suitable for structures that can be assembled by direct fitting; the key considerations are dimensional tolerances, thickness, and groove clearance.
Confirm Dimensions →
03
Single-sided support configuration
For unidirectional compression conditions, configure single-sided supports according to the actual direction of the pressure.
Send Operating Condition Confirmation →
04
Bilateral Support Configuration
For bidirectional compression or pressure reversal conditions, install supports on both sides of the O-ring.
Confirm via screenshot →Once the structure has been finalizedSelect materials based on the medium, temperature, and dynamic load
STEP 02
Select Materials Again
PTFE, filled PTFE, nylon, and POM—these four types.
PTFE
Polytetrafluoroethylene
Excellent chemical resistance and low-friction performance, suitable for a wide range of media and temperature conditions
Chemical Resistance and Low Friction
PTFE Filler
Filling System
Improve wear resistance, creep resistance, or dimensional stability through the use of filler systems
Wear-Resistant and Creep-Resistant
Nylon
Nylon
Excellent strength and wear resistance, suitable for high-pressure dynamic sealing applications
Strength and Wear Resistance
POM
Polyformaldehyde
It offers excellent mechanical strength and machining stability, making it suitable for parts with specific dimensional accuracy requirements.
Processing StabilitySPECIFICATION
Existing Product Specifications
Material SelectionPTFE, filled PTFE, nylon, POM
Hardness RangeShore D 60–85
Temperature range-40°C to +200°C
Dielectric Strength DataUp to 700 bar
Size RangeInner diameter: 4–500 mm
Surface treatmentPrecision Grinding: Ra ≤ 0.8 μm
The actual applicable range must be determined on a case-by-case basis based on material, cross-section, fitting clearance, temperature, medium, and dynamic and static conditions.
Do you have any old parts, drawings, or operating conditions?
Forward it directly to Chengxin for his assessment.
HIGH-PRESSURE APPLICATIONS
Three Types of High-Pressure Operating Conditions, Each with Its Own Key Evaluation Criteria
The anti-extrusion solution is determined by a combination of temperature, medium, pressure cycles, clearance, and assembly method.
Petrochemical Process Piping | High-Temperature, High-Pressure Corrosion
For high-temperature, high-pressure, and corrosive media, verify material compatibility and deformation under prolonged pressure.
Corresponding parts:O-Ring、Backup Ring
Aviation Hydraulic Valves | Pressure Cycling
Verify structural support, friction, and dimensional stability under cyclic stress and temperature fluctuations.
Corresponding parts:Hydraulic Seals
Common Locations for Anti-Extrusion Rings on Equipment
Machine Tools | Hold-Pressure and Machining Accuracy
Hydraulic cylinders, clamping fixtures, and precision feed systems—the focus is on pressure maintenance and machining accuracy.
Corresponding parts:Hydraulic Seals
Plastic Injection Molding Machines | High Pressure and Temperature Fluctuations
With frequent fluctuations in high pressure and temperature, the design balances wear resistance, dimensional stability, and maintenance intervals.
Corresponding parts:Backup Ring
Construction Equipment | Dust and Off-Center Loads
If there is significant dust, vibration, or off-center loading, check the grooves and clearance simultaneously.
Corresponding parts:Hydraulic Seals
Automation Equipment | Stable Operation
Pneumatic and hydraulic drives and reciprocating mechanisms focus on ensuring stable operation and minimizing unplanned downtime.
Corresponding parts:O-Ring
INCOMING MATERIAL VERIFICATION
Verified materials, peace of mind with every delivery
Each batch of parts is accompanied by comparison results and documentation, so they can be accepted directly by the quality control department.
FTIR Material ComparisonWe verified the feedstock material through spectral analysis, and it matched the specifications.
Test reports are traceableThe comparison results and inspection records are retained and can be provided upon request.
The documents are in order, and the specifications are ready for acceptance.Material certification and compliance documentation are provided based on manufacturer or third-party documents, including requirements such as REACH, RoHS, FDA, COA, PFAS, and PFOS.
Simultaneous Verification of Dimensions and AppearanceDimensions and appearance are checked on a batch-by-batch basis and match the drawings.
CUSTOMER SUCCESS
In the end, what we saw was that the equipment really did become more stable.
If the judgment is correct, the equipment will naturally run smoothly.
Hydraulic Equipment
Hydraulic Equipment | Seal Restabilization
After reviewing the materials, dimensions, and actual operating conditions of the sealing components, proceed with the appropriate replacements and adjustments.
After switching to the appropriate materials and sizes, the equipment returned to stable operation.
Food Equipment
Food Equipment | Sealing and Documentation—All in One
Chengxin will assist in selecting sealing components based on the operating conditions and provide the corresponding material documentation.
The sealing solution, along with the accompanying technical documentation, successfully passed the internal quality control process.
High-Temperature, High-Pressure Equipment
High Temperature and High Pressure | Stable Sealing, Easy-to-Control Shutdown
In light of high-temperature, high-pressure, and extended-operation conditions, we re-evaluate material compatibility, dimensions, and installation requirements to ensure that components truly meet the equipment’s needs.
Sealing performance is consistent, making it easy to schedule downtime.
TYPICAL RESOLUTION PROCESS
From damage caused by repeated extrusion to a form that meets manufacturing specifications
Gradually refine the specifications based on photographs, old parts, drawings, and operating conditions to provide a consistent basis for procurement and maintenance.
01
Identify the location of the failure
First, examine the bite marks, cut edges, and extrusion direction on the O-ring to identify the direction of pressure and any issues with the clearance.
02
Verify the Groove and Operating Conditions
List dimensions, tolerances, pressure, temperature, media, and motion states in a single decision table.
03
Convergence Materials and Structures
Confirm whether the part is single-sided or double-sided, open or full-ring, and the applicable orientation for PTFE, filled PTFE, nylon, or POM.
04
Establishing Deliverable Specifications
Compile the inner and outer diameters, thickness, quantity, machining tolerances, and documentation requirements into a version suitable for quoting and prototyping.
INQUIRY CHECKLIST
With just four sets of data, the engineer was able to make an immediate assessment.
Starting with the photos, old items, or measurements you have on hand, Chengxin will help you gather everything you need for the repair.
01
Invalid Photo
Take photos of the damaged area, the direction of extrusion, the grooves, and the equipment installation location.
02
Drawings or Dimensions
Please provide the inner diameter, outer diameter, thickness, and groove dimensions, or send us your old part directly for evaluation.
03
Operating Conditions
Pressure, temperature, medium, velocity, and dynamic or static operating conditions.
04
Delivery Requirements
Quantity, desired timeline, sample or batch requirements, as well as material and quality documentation.
FAQ
Frequently Asked Questions About Anti-Extrusion Rings
What is the difference between a non-extrusion ring and an O-ring?
The O-ring provides the primary seal; the anti-extrusion ring provides structural support and reduces the risk of the O-ring being pushed into the clearance under high pressure, which could cause it to be cut or deformed.
How do I choose between unilateral and bilateral support?
For unidirectional compression, the support on the high-pressure side is typically evaluated first; when the pressure may reverse, the system operates bidirectionally, or operating conditions vary significantly, the configuration on both sides is further evaluated.
Can I still ask about it even if I only have the old part?
Sure. Please start by providing photos of the old part and its measurements; if necessary, send a sample. We can then determine the specifications based on the existing structure and failure conditions.
What are PTFE, nylon, and POM each suitable for?
Each of the three materials has its own characteristics in terms of chemical resistance, friction, wear resistance, strength, temperature resistance, and dimensional stability; the appropriate material should be selected based on the working medium, pressure, and dynamic and static conditions.
What information should I provide when requesting a quote?
Please provide the dimensions or a photo of the old part, along with the operating pressure, temperature, medium, application, and quantity, so we can begin our assessment; you may also specify any documentation and delivery schedule requirements at the same time.
CHENGSYIN SEALING SUPPORT
Organize the sealing issues into specifications that can be used for manufacturing
Send us photos, drawings, dimensions, or information about the old part, and Chengxin will begin its assessment by evaluating the cause of failure, materials, structure, and manufacturing feasibility.