• Precision Machined Wedge: The angle and finish of the PTFE wedge are machined to micron-level tolerances to ensure it seats perfectly against the shaft without binding.
• Spring Energized: Multiple springs ensure even face loading and help the wedge maintain contact during thermal cycling.
Key Features
• Universal Chemical Resistance: The PTFE wedge is inert to almost all industrial chemicals, solvents, and corrosive agents.
• High-Temperature Stability: Unlike rubber O-rings that can harden or melt, the PTFE wedge maintains its integrity up to 260°C.
• Robust Drive Mechanism: Uses a positive pin or set-screw drive to handle the higher friction and torque associated with PTFE wedge movement.
Technical Specs | Materials | ||
Mediums | Petroleum, chemical solvents, medium corrosion. | Stationary Ring | Ceramic/Sic/TC |
Temperature | 30℃ to 200℃ | Rotary Ring | Carbon/Sic/TC |
Pressure | ≤2.5MPa | Secondary Seal | PTFE |
Speed | ≤25m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| Inch Shaft Size D1 | Size Code | D1 | D2 | D3 | D7 | L1 | L4 | L3 |
| 0.625 | 0158 | 15.87 | 12.7 | 30.7 | 25.40 | 27 | 7.95 | 4.8 |
| 0.750 | 0191 | 19.05 | 15.9 | 34.0 | 31.75 | 30 | 10.3 | 4.8 |
| 0.875 | 0222 | 22.22 | 19.1 | 37.2 | 34.93 | 32 | 10.3 | 6.4 |
| 1.000 | 0254 | 25.40 | 22.2 | 40.3 | 38.10 | 33 | 10.3 | 6.4 |
| 1.125 | 0286 | 28.58 | 25.4 | 43.5 | 41.28 | 35 | 11.1 | 7.9 |
| 1.250 | 0317 | 31.75 | 28.6 | 48.3 | 44.45 | 35 | 11.1 | 7.9 |
| 1.375 | 0349 | 34.93 | 28.6 | 51.5 | 44.45 | 37 | 11.1 | 8.7 |
| 1.500 | 0381 | 38.10 | 31.8 | 54.6 | 47.63 | 37 | 11.1 | 8.7 |
| 1.625 | 0412 | 41.28 | 34.9 | 61.0 | 50.80 | 45 | 11.1 | 8.7 |
| 1.750 | 0444 | 44.45 | 38.1 | 64.2 | 53.98 | 45 | 11.1 | 9.5 |
| 1.875 | 0476 | 47.62 | 41.3 | 67.3 | 60.33 | 45 | 12.7 | 9.5 |
| 2.000 | 0508 | 50.80 | 44.5 | 70.5 | 63.50 | 45 | 12.7 | 9.5 |
| 2.125 | 0539 | 53.98 | 47.6 | 76.9 | 66.68 | 52 | 12.7 | 11.1 |
| 2.250 | 0571 | 57.15 | 50.8 | 80.0 | 69.86 | 52 | 12.7 | 11.1 |
| 2.375 | 0603 | 60.33 | 54.0 | 83.2 | 76.20 | 52 | 14.3 | 11.1 |
| 2.500 | 0635 | 63.50 | 57.2 | 86.4 | 79.38 | 52 | 14.3 | 11.1 |
| 2.625 | 0666 | 66.68 | 60.3 | 89.6 | 82.55 | 52 | 14.3 | 11.1 |
| 2.750 | 0698 | 69.85 | 63.5 | 92.7 | 85.73 | 52 | 14.3 | 11.1 |
| 2.875 | 0730 | 73.03 | 66.7 | 95.9 | 85.73 | 52 | 14.3 | 11.1 |
| 3.000 | 0762 | 76.20 | 69.9 | 97.5 | 88.90 | 52 | 15.9 | 11.1 |
| 3.125 | 0794 | 79.38 | 73.0 | 100.7 | 95.25 | 52 | 15.9 | 11.1 |
| 3.250 | 0825 | 82.55 | 76.2 | 105.4 | 98.43 | 52 | 15.9 | 14.3 |
| 3.375 | 0857 | 85.73 | 79.4 | 108.6 | 101.60 | 52 | 19.8 | 14.3 |
| 3.500 | 0889 | 88.90 | 82.6 | 111.8 | 104.78 | 52 | 19.8 | 14.3 |
| 3.625 | 0921 | 92.08 | 85.7 | 115.0 | 107.95 | 52 | 19.8 | 14.3 |
| 3.750 | 0953 | 95.25 | 88.9 | 118.1 | 111.13 | 52 | 19.8 | 14.3 |
| 3.875 | 0984 | 98.43 | 92.1 | 121.3 | 114.30 | 52 | 19.8 | 14.3 |
| 4.000 | 1016 | 101.60 | 95.3 | 124.5 | 117.48 | 52 | 19.8 | 14.3 |
Workshop
This workshop is equipped with professional processing equipment and integrated with standardized material warehousing management, enabling a one-stop production process from precision machining to finished product delivery. It ensures part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.
Product Research, Development and Testing
Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.
Industry Solutions
Case Study
Solvent Transfer: A paint factory was replacing FKM O-ring seals monthly due to solvent swelling. We installed our PTFE Wedge Seal. The inert PTFE material was unaffected by the ketones and acetates, extending seal life to over 2 years.
Testimonials
The only seal that survives our aggressive solvent lines. The PTFE wedge design is simple but incredibly effective.
—Maintenance Manager, Chemical Plant
FAQs about Metal Bellows Seals for High Temperature Pumps
Q: How does a PTFE wedge differ from an O-ring?
A: An O-ring is elastic and rolls or slides. A PTFE wedge is rigid and non-elastic; it forms a seal by being wedged into a conical space by spring force. It offers far superior chemical resistance but requires a smoother shaft finish and careful installation.
Our company is specialized in the production of sealing materials, mechanical seals , cartridge seals.
E-mail: gechacha@aliyun.com
Mobile: +86-18758835650
WhatsApp: +86-18758835650
Add: No8-2, Jinsha road Yuelin Street, Fenghua District, Ningbo, Zhejiang
