PTFE dry mechanical seals offer a cost-effective, factory-direct price point, supplying pure-PTFE wedge secondary seals engineered for gas-phase or low-lubricity duty on top-entry mixers, reaction kettles and solvent recovery columns. As a drop-in OEM-interchangeable ptfe mechanical seal for AES T01/T03/T04, John Crane Type 9 and Flowserve RO configurations, the dry-running variant pairs a self-lubricating carbon graphite rotating face with SiC or TC stationary seat, holding leak-tight performance up to 260°C and 25 bar with no barrier fluid required.
Key Features
• Dry-Running Capability: Faces are manufactured from self-lubricating grades of Silicon Carbide or Carbon, allowing operation in gas or powder phases.
• Chemical Resistance: The PTFE wedge in this dry mechanical seal ensures compatibility with corrosive vapors and powders.
• Contamination Free: Eliminates the need for barrier fluids or external lubrication that could contaminate sensitive batch products.
• Diamond Coating (Optional): We can offer Diamond-Coated SiC faces for extreme dry-run durability and low friction.
• Dust Protection: This dry mechanical seal includes a dust lip or scraper to prevent powder from packing into the PTFE wedge area.
Technical Specs | Materials | ||
Mediums | Petroleum, chemical solvents, medium corrosion. | Stationary Ring | Ceramic/Sic/TC |
Temperature | -20℃ to 200℃ | Rotary Ring | Carbon/Sic/TC |
Pressure | ≤1.7MPa | Secondary Seal | PTFE |
Speed | ≤25m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| Metric Shaft Size D1 | Size Code | D3 | D7 | L1 | L4 |
| 16 | 0160 | 26.0 | 27.0 | 23.0 | 12.0 |
| 18 | 0180 | 32.0 | 33.0 | 24.0 | 13.5 |
| 20 | 0200 | 34.0 | 35.0 | 24.0 | 13.5 |
| 22 | 0220 | 36.0 | 37.0 | 24.0 | 13.5 |
| 24 | 0240 | 38.0 | 39.0 | 26.7 | 13.3 |
| 25 | 0250 | 39.0 | 40.0 | 27.0 | 13.0 |
| 28 | 0280 | 42.0 | 43.0 | 30.0 | 12.5 |
| 30 | 0300 | 44.0 | 45.0 | 30.5 | 12.0 |
| 32 | 0320 | 46.0 | 48.0 | 30.5 | 12.0 |
| 33 | 0330 | 47.0 | 48.0 | 30.5 | 12.0 |
| 35 | 0350 | 49.0 | 50.0 | 30.5 | 12.0 |
| 38 | 0380 | 54.0 | 56.0 | 32.0 | 13.0 |
| 40 | 0400 | 56.0 | 58.0 | 32.0 | 13.0 |
| 43 | 0430 | 59.0 | 61.0 | 32.0 | 13.0 |
| 45 | 0450 | 61.0 | 63.0 | 32.0 | 13.0 |
| 48 | 0480 | 64.0 | 66.0 | 32.0 | 13.0 |
| 50 | 0500 | 66.0 | 70.0 | 34.0 | 13.5 |
| 53 | 0530 | 69.0 | 73.0 | 34.0 | 13.5 |
| 55 | 0550 | 71.0 | 75.0 | 34.0 | 13.5 |
| 58 | 0580 | 78.0 | 78.0 | 39.0 | 13.5 |
| 60 | 0600 | 80.0 | 80.0 | 39.0 | 13.5 |
| 63 | 0630 | 83.0 | 83.0 | 39.0 | 13.5 |
| 65 | 0650 | 85.0 | 85.0 | 39.0 | 13.5 |
| 68 | 0680 | 88.0 | 90.0 | 39.0 | 13.5 |
| 70 | 0700 | 90.0 | 92.0 | 45.5 | 14.5 |
| 75 | 0750 | 95.0 | 97.0 | 45.5 | 14.5 |
| 80 | 0800 | 104.0 | 105.0 | 45.0 | 15.0 |
| 85 | 0850 | 109.0 | 110.0 | 45.0 | 15.0 |
| 90 | 0900 | 114.0 | 115.0 | 50.0 | 15.0 |
| 95 | 0950 | 119.0 | 120.0 | 50.0 | 15.0 |
| 100 | 1000 | 124.0 | 125.0 | 50.0 | 15.0 |
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 of dry mechanical seal components to finished product delivery. Dedicated production lines for each dry mechanical seal model ensure part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements for gas-phase mixer, reaction kettle and solvent recovery applications.
Product Research, Development and Testing
Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All dry mechanical 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
Pharmaceutical Powder Mixer: A dryer/mixer for pharmaceutical powders needed a seal that wouldn't contaminate the product with oil. We installed this Dry SiC PTFE Wedge Seal. It has run for 12 months dry, maintaining a vacuum seal without any liquid support.
Testimonials
We use these on our top-entry reactors. They run dry during the emptying cycle and hold up perfectly.
—Production Lead, Fine Chemicals
FAQs
Q: Can standard SiC run dry?
A: No, standard SiC will overheat and crack. This seal uses a specialized graphite-loaded SiC or a specific face topography designed to reduce friction in dry conditions.
Q: What is a PTFE dry mechanical seal, and how does it differ from a standard wet-running seal?
A: A dry mechanical seal is designed to operate without liquid lubrication at the seal faces—typically in the gas phase of top-entry mixers, reaction kettles or solvent recovery columns where the liquid level is below the seal. Unlike wet seals that rely on process fluid for cooling and lubrication, the PTFE dry seal uses a self-lubricating carbon graphite rotating face paired with SiC or TC stationary seat, generating minimal heat through optimized face flatness and spring loading.
Q: Which pump and mixer models are compatible with these PTFE dry seals?
A: They are drop-in OEM-interchangeable replacements for AES T01/T03/T04, John Crane Type 9 and Flowserve RO configurations, fitting top-entry mixers, reaction kettles and solvent recovery columns from manufacturers such as Kewpump KS/KCM, Chemineer, Lightnin and local Indian mixer brands. No barrier fluid system is required—simply install the dry mechanical seal and connect a vent to atmosphere or flare.
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
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