Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
Virgin PTFE Double Spring Energized Seal
High-Performance Seal for Corrosion, Low Friction & Wide Temp
This dual-spring energized seal uses premium virgin PTFE, boasting superior chemical resistance to withstand harsh media and a low friction coefficient that reduces surface wear. Its double helical spring design delivers steady, long-lasting sealing pressure, ensuring reliability even with fluctuating pressure or temperatures.
Suitable for hydraulic/pneumatic systems, chemical equipment, and precision machinery, it merges virgin PTFE’s durability with the spring’s adaptability to solve leakage and premature failure issues in critical industrial applications.
5.0
design customization
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1. Product Advantages
Superior Material Performance: Crafted from 100% virgin PTFE, the seal exhibits exceptional chemical resistance—resisting corrosive media (acids, alkalis, solvents) without degradation. It also features an ultra-low friction coefficient (<0.05) to minimize wear on mating surfaces, extending the seal’s service life by 30% compared to standard PTFE seals.
Reliable Sealing Force: The dual helical spring design provides consistent, adaptive energizing force. Even under fluctuating pressure (0-50 MPa) or temperature (-200°C to +260°C), the spring maintains tight contact between the seal and sealing surface, eliminating leakage risks.
Long-Term Durability: Virgin PTFE’s high tensile strength and creep resistance prevent permanent deformation, while the spring’s stainless steel core (optional 316L) resists rust and fatigue—ensuring stable performance in continuous-operation scenarios.
2. Working Principle
This seal operates on a “spring energization + PTFE lip sealing” dual mechanism:
Spring Energization: The pre-compressed double helical spring exerts constant radial/axial force on the PTFE sealing lip, forcing it to tightly fit the mating surface (e.g., cylinder bore, piston rod) and form an initial seal.
Pressure-Assisted Sealing: As system pressure increases, the pressure pushes the PTFE lip further against the sealing surface, enhancing the seal’s tightness—adapting to dynamic pressure changes without manual adjustment.
3. Product Details
| Specification | Parameter |
|---|---|
| Material | Virgin PTFE (sealing lip); Stainless steel 304/316L (spring core) |
| Temperature Range | -200°C to +260°C (-328°F to +500°F) |
| Pressure Range | 0-50 MPa (0-7250 psi) |
| Friction Coefficient | ≤0.05 (dry running); ≤0.02 (with lubrication) |
| Standard Sizes | ID 5mm - 500mm (custom sizes available for non-standard applications) |
| Surface Finish | Polished PTFE lip (Ra ≤0.2μm) for reduced friction |
4. Application Range
Ideal for industries and scenarios requiring high sealing reliability and chemical resistance:
Hydraulic/Pneumatic Systems: Sealing for cylinders, valves, and actuators in construction machinery, aerospace, and automotive equipment.
Chemical Processing: Sealing for pumps, reactors, and pipelines handling acids (H₂SO₄), alkalis (NaOH), and organic solvents.
Semiconductor & Food Pharma: Complies with FDA standards (21 CFR Part 177.1550) and ultra-clean requirements, suitable for semiconductor wafer processing and food/beverage transfer equipment.
Extreme Environments: Low-temperature cryogenic equipment (LNG tanks) and high-temperature industrial ovens.
5. FAQ
Q1: What’s the difference between “virgin PTFE” and “filled PTFE” for this seal?
A1: Virgin PTFE offers pure chemical resistance and low friction, making it ideal for corrosive or ultra-clean applications. Filled PTFE (e.g., with glass fiber) adds rigidity but may compromise chemical resistance—Forever Seals recommends virgin PTFE for most critical sealing needs.
A1: Virgin PTFE offers pure chemical resistance and low friction, making it ideal for corrosive or ultra-clean applications. Filled PTFE (e.g., with glass fiber) adds rigidity but may compromise chemical resistance—Forever Seals recommends virgin PTFE for most critical sealing needs.
Q2: Can this seal be customized for non-standard sizes?
A2: Yes. Forever Seals provides custom machining based on your equipment’s drawings (e.g., special IDs, widths, or spring materials like Inconel for high-temperature use) with a lead time of 5-7 business days.
A2: Yes. Forever Seals provides custom machining based on your equipment’s drawings (e.g., special IDs, widths, or spring materials like Inconel for high-temperature use) with a lead time of 5-7 business days.
Q3: How to maintain the seal to extend its service life?
A3: Avoid sharp scratches on the sealing lip during installation; use compatible lubricants (e.g., silicone grease for low-temperature use); and replace the seal if leakage, abnormal friction noise, or pressure drops are detected.
A3: Avoid sharp scratches on the sealing lip during installation; use compatible lubricants (e.g., silicone grease for low-temperature use); and replace the seal if leakage, abnormal friction noise, or pressure drops are detected.
6. Enterprise Selling Points (Forever Seals)
15+ Years of Expertise: Specialized in high-performance sealing solutions, with a R&D team that holds 8 patents for spring-energized seal designs.
Quality Assurance: All virgin PTFE materials are sourced from FDA-approved suppliers; each seal undergoes 100% pressure testing (0.8 MPa air tightness test) before delivery.
Global Support: Offers 24/7 technical consultation (via email/phone) and on-site installation guidance for major clients; maintains warehouses in Europe, the US, and Asia for fast delivery (3-5 days for standard models).
Sustainability Commitment: Uses recyclable packaging and energy-efficient production processes, aligning with global environmental standards (ISO 14001 certified).
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