Custom Stepped Combination Seal Manufacturer | High-Performance PTFE Step Seals for Hydraulic Applications
Introduction
Modern hydraulic equipment operates under increasingly demanding conditions. Higher pressures, faster operating speeds, and longer service intervals require sealing solutions that deliver outstanding reliability without sacrificing efficiency.
A Stepped Combination Seal, also known as a PTFE Step Seal Ring, is specifically designed for these challenging environments. By combining the low-friction properties of PTFE with the elasticity of an energized rubber O-ring, the seal provides exceptional leakage control, excellent wear resistance, and a long service life in both dynamic and static hydraulic applications.
At Xiamen Jinshun Sealing Technology Co., Ltd., we have specialized in manufacturing custom stepped combination seals since 2002. Our OEM and ODM sealing solutions are trusted by manufacturers of hydraulic cylinders, injection molding machines, machine tools, construction equipment, industrial presses, and automation systems worldwide.
All products are manufactured under ISO 9001:2015 and ISO 14001:2015 quality management systems using materials compliant with RoHS, REACH, and PAHS, with selected compounds available to meet FDA, NSF, WRAS, ACS, LFGB, KTW-W270, and UL requirements.
What Is a Stepped Combination Seal?
A stepped combination seal consists of two precision-engineered sealing elements:
- PTFE Step Ring – provides low friction, wear resistance, and primary sealing.
- Rubber Energizer (O-Ring) – applies continuous radial force, ensuring reliable sealing even under pressure fluctuations.
Unlike conventional rubber seals, the stepped profile allows hydraulic pressure to assist sealing performance. As system pressure increases, the PTFE sealing lip is energized more effectively, creating a tighter seal while maintaining low friction.
This pressure-assisted design makes stepped combination seals ideal for demanding hydraulic systems.
Why Choose a Stepped Combination Seal?
Compared with traditional U-cups or standard O-rings, stepped combination seals offer several significant advantages:
- Excellent sealing under high pressure
- Extremely low running friction
- Reduced stick-slip during low-speed operation
- Superior wear resistance
- Longer service life
- Lower energy consumption
- Reduced heat generation
- High dimensional stability
- Minimal maintenance
- Suitable for dry-running during short periods
These benefits help improve equipment efficiency while extending maintenance intervals.
Technical Specifications
| Item | Specification |
|---|---|
| Product Name | Stepped Combination Seal |
| Seal Type | PTFE Step Seal with Elastomer Energizer |
| Pressure Range | ≤ 60 MPa |
| Operating Speed | ≤ 15 m/s |
| Temperature Range | -30°C to +200°C (material dependent) |
| Dynamic Application | Yes |
| Static Application | Yes |
| Standard Materials | PTFE + NBR / PTFE + FKM |
| Custom Materials | PTFE + EPDM, HNBR, Silicone (upon request) |
| Installation | Piston or Rod Seal |
| OEM & ODM | Available |
| Custom Sizes | Available according to drawings or samples |
Material Options
Material selection directly affects sealing performance, service life, and operating reliability.
PTFE + NBR
The most cost-effective solution for general hydraulic applications.
Advantages:
- Excellent wear resistance
- Good oil resistance
- Low friction
- Stable sealing performance
- Economical choice for standard hydraulic equipment
Typical applications:
- Hydraulic cylinders
- Industrial machinery
- Injection molding equipment
- Construction machinery
PTFE + FKM
Designed for more demanding operating environments.
Advantages:
- Superior high-temperature resistance
- Excellent chemical compatibility
- Outstanding aging resistance
- Better performance in aggressive hydraulic fluids
Typical applications:
- Chemical processing equipment
- High-temperature hydraulic systems
- Heavy-duty industrial machinery
- Continuous-duty automation equipment
Our engineering team can recommend the most suitable material combination based on operating temperature, pressure, fluid compatibility, and expected service life.
Performance Under High Pressure
Hydraulic systems are becoming more powerful every year, and sealing technology must keep pace.
Our stepped combination seals are engineered for operating pressures up to 60 MPa, making them suitable for many high-performance hydraulic applications.
The stepped PTFE profile distributes hydraulic pressure more evenly across the sealing surface, reducing localized stress concentrations that can lead to premature wear or leakage.
The result is:
- Improved sealing reliability
- Reduced extrusion risk
- Longer service life
- Better pressure stability
Wide Temperature Capability
Temperature has a direct impact on seal performance.
Our stepped combination seals operate reliably across a wide temperature range of -30°C to +200°C, depending on the selected elastomer.
| Material Combination | Typical Temperature Range |
|---|---|
| PTFE + NBR | -30°C to +120°C |
| PTFE + FKM | -20°C to +200°C |
The PTFE sealing ring maintains low friction, while the elastomer energizer preserves elasticity across changing temperatures.
This combination minimizes hardening in cold environments and resists thermal aging during continuous high-temperature operation.
High-Speed Dynamic Performance
Dynamic sealing performance depends on both friction and material stability.
Our stepped combination seals support reciprocating speeds of up to 15 m/s, making them suitable for high-cycle hydraulic equipment.
Low-friction PTFE helps reduce:
- Heat generation
- Energy loss
- Wear
- Surface damage
- Stick-slip motion
This results in smoother cylinder movement and improved equipment efficiency.
Compatible Hydraulic Media
The stepped combination seal is compatible with a wide variety of industrial fluids.
Common media include:
- Mineral hydraulic oil
- HFA fire-resistant fluids
- HFB fire-resistant fluids
- Water-glycol hydraulic fluids
- Compressed air
- Lubricating oils
- Industrial hydraulic fluids
Proper material selection ensures maximum sealing performance and extended service life.
Typical Applications
Stepped combination seals are widely used wherever high-pressure dynamic sealing is required.
Hydraulic Cylinders
Reliable sealing for piston and rod applications under continuous pressure cycles.
Injection Molding Machines
Excellent performance during high-pressure clamping and injection operations.
Machine Tools
Precision hydraulic systems require stable sealing with minimal friction.
Hydraulic Presses
Ideal for heavy-duty cylinders operating under high loads and repeated pressure cycles.
Construction Equipment
Suitable for excavators, loaders, cranes, and other hydraulic-powered machinery.
Industrial Automation
Provides long-lasting sealing for automated production equipment requiring high positioning accuracy.
Why Choose Xiamen Jinshun?
Since 2002, Xiamen Jinshun Sealing Technology Co., Ltd. has supplied custom sealing solutions to OEM manufacturers and industrial equipment companies around the world.
Our strengths include:
- More than 20 years of sealing manufacturing experience
- OEM & ODM customization
- Custom PTFE machining
- Precision mold development
- Competitive factory-direct pricing
- Fast prototype production
- Stable mass production
- ISO-certified manufacturing
- Professional engineering support
- Reliable global export service
Quality Assurance
Every stepped combination seal undergoes comprehensive quality inspection before shipment.
Testing includes:
- Dimensional inspection
- Surface finish inspection
- Hardness testing
- Material verification
- Compression testing
- Wear resistance evaluation
- Visual inspection
All products are manufactured under strict quality procedures to ensure consistent sealing performance.
How to Select the Right Step Seal
Choosing the correct stepped combination seal depends on several operating conditions.
| Selection Factor | Recommendation |
|---|---|
| Pressure | Up to 60 MPa |
| Temperature | Choose NBR or FKM based on operating temperature |
| Hydraulic Fluid | Verify media compatibility |
| Speed | Suitable up to 15 m/s |
| Installation Groove | Follow ISO or customer drawing |
| Equipment Type | Rod seal or piston seal selection |
Working with an experienced sealing manufacturer helps optimize seal life and reduce maintenance costs.
Frequently Asked Questions (FAQs)
What is a stepped combination seal?
A stepped combination seal is a PTFE-based hydraulic seal energized by an elastomer O-ring. It combines low friction with excellent sealing performance under high pressure.
What pressure can a stepped combination seal withstand?
Our standard designs operate at pressures up to 60 MPa, depending on application conditions, groove design, and material selection.
What materials are available?
The most common combinations are:
- PTFE + NBR
- PTFE + FKM
Other elastomer combinations can be customized upon request.
Can you manufacture custom step seals?
Yes.
We manufacture OEM step seals according to customer drawings, CAD files, technical specifications, or samples.
Which industries use stepped combination seals?
Our products are widely used in:
- Hydraulic cylinders
- Injection molding machines
- Machine tools
- Hydraulic presses
- Construction equipment
- Industrial automation
- Agricultural machinery
- Mining equipment
Why is PTFE used in step seals?
PTFE offers an exceptionally low coefficient of friction (typically 0.05–0.10 under dry conditions), excellent wear resistance, outstanding chemical stability, and a wide operating temperature range. These properties help reduce energy loss, minimize wear, and extend seal service life.
Looking for a Reliable Stepped Combination Seal Manufacturer?
Whether you need PTFE step seals, hydraulic piston seals, rod seals, custom combination seals, or high-pressure sealing solutions, Xiamen Jinshun Sealing Technology Co., Ltd. is ready to support your next project.
With over 20 years of manufacturing experience, advanced PTFE processing capabilities, ISO-certified production, and extensive OEM expertise, we deliver sealing solutions that improve equipment reliability, reduce downtime, and lower total operating costs.
Contact our engineering team today for a free technical consultation, material recommendation, prototype development, or a competitive quotation. We welcome OEM manufacturers, hydraulic equipment builders, industrial distributors, and global wholesale partners seeking high-quality custom stepped combination seals.
