The Flygt metal bellow mechanical seal is a heavy-duty, corrosion-resistant cartridge seal engineered as a direct OEM replacement for Flygt submersible pumps (including 2000, 3000, and 5000 series). Featuring a robust Hastelloy C-276 bellows and Tungsten Carbide (TC) faces, it is specifically designed to handle the harshest conditions, including raw sewage, abrasive slurries, and aggressive chemicals in mining and wastewater applications. Its self-cleaning, clog-proof design eliminates the failure points associated with traditional elastomer seals.
Key Features
• Extreme Duty Upgrade: A premium aftermarket replacement designed to upgrade standard elastomer Flygt seals to a robust metal bellow design.
• Clog-Proof Architecture: Eliminates the dynamic O-ring found in pusher seals, preventing "hang-up" caused by sludge, fibers, or sticky wastewater deposits.
• High Temperature Capable: Ideal for hot industrial wastewater applications where standard NBR or FKM rubber bellows might swell or fail.
• Self-Cleaning Action: The centrifugal force generated by the rotating metal bellow leaflets actively throws solids away from the seal face, maintaining a clean operating environment.
• Hastelloy Construction: Manufactured with Hastelloy® C-276 bellows as standard to resist stress corrosion cracking in chloride-rich environments like tannery or chemical waste.
Technical Specs | Materials | ||
Mediums | Sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, and nitric acid with various degrees. etc. | Stationary Ring | Ceramic/Sic/Ssic |
Pressure | ≤0.5MPa | Rotary Ring | Teflon/Sic/Ssic |
Temperature | -20℃ to 120℃ | Secondary Seal | Teflon |
Speed | ≤10m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| D1 (mm) | Size | D3 | D7 | D6 | L4 | L1 | L12 |
| 25 | 0250 | 60 | 60 | 47 | 27 | 42 | 45 |
| 30 | 0300 | 67 | 67 | 53 | 27 | 42 | 45 |
| 32 | 0320 | 69 | 64 | 50.7 | 27 | 42 | 45 |
| 35 | 0350 | 72 | 70 | 57 | 27 | 42 | 45 |
| 40 | 0400 | 78 | 76 | 62 | 26 | 42 | 45 |
| 45 | 0450 | 84 | 82 | 67 | 27 | 44 | 46 |
| 50 | 0500 | 88 | 86 | 72 | 27 | 46 | 46 |
| 55 | 0550 | 95 | 90 | 77 | 27 | 46 | 46 |
| 60 | 0600 | 100 | 95 | 82 | 27 | 46 | 46 |
| 65 | 0650 | 105 | 100 | 87 | 27 | 46 | 46 |
| 1" | 0254 | 60 | 54 | 42.86 | 17.5 | 42 | 45 |
| 1 1/8" | 0286 | 67 | 60 | 46.03 | 27 | 42 | 45 |
| 1 1/4" | 0317 | 69 | 65 | 50.8 | 27 | 42 | 45 |
| 1 3/8" | 0349 | 72 | 68 | 53.98 | 27 | 42 | 45 |
| 1 1/2" | 0381 | 76 | 71 | 57.15 | 27 | 42 | 45 |
| 1 5/8" | 0412 | 80 | 78 | 63.5 | 27 | 42 | 45 |
| 1 3/4" | 0444 | 84 | 81 | 66.68 | 27 | 44 | 46 |
| 1 7/8" | 0476 | 86 | 84 | 69.85 | 27 | 44 | 46 |
| 2" | 0508 | 90 | 87 | 73.03 | 27 | 46 | 46 |
| 2 1/8" | 0539 | 95 | 97 | 79.38 | 33.5 | 46 | 46 |
| 2 1/4" | 0571 | 98 | 100 | 82.55 | 33.5 | 46 | 46 |
| 2 3/8" | 0603 | 100 | 103 | 85.73 | 33.5 | 46 | 46 |
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 metal bellow 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
Tannery Wastewater: A tannery sump pump failed repeatedly due to hot, chemically aggressive sludge attacking the rubber bellows. We installed this Metal Bellow replacement. The all-metal construction resisted the chemicals and heat, extending pump runtime from 3 months to over 2 years.
Testimonials
We put these in the pits where nothing else survives. They cost more than the rubber ones but save us thousands in maintenance labor.
—Maintenance Planner, Industrial Park
FAQs
Q: Does this fit the standard Plug-in housing?
A: Yes, we have engineered cartridge versions that fit directly into the standard Flygt Plug-in or Griploc seal chambers (e.g., 3153, 3171) without requiring any modification to the pump.
Q: Is this seal a direct replacement for my Flygt pump's original seal?
A: Yes, this seal is designed as a direct form-fit-function replacement for standard Flygt metal bellows seals used in popular models like the 2600, 3100, 5100, and 3300 series. It matches the OEM dimensions (shaft size, OD, length) for a plug-and-play installation. Always verify your pump model and shaft diameter before ordering.
Q: Why choose a metal bellows seal over an elastomer bellows for Flygt pumps?
A: Metal bellows seals are mandatory for harsh services. They offer superior chemical resistance (especially to oils and solvents that swell rubber), higher temperature tolerance (up to 200°C+), and a self-cleaning action that prevents clogging in fibrous wastewater, which is a common failure point for elastomer seals.
Q: How do I select the correct size for my Flygt pump?
A: The correct size is determined by the pump model and the shaft diameter (D1). Common sizes are 25mm, 35mm, 45mm, and 60mm. Refer to your pump's manual or the existing seal's part number. If unsure, provide the Flygt pump model (e.g., 3153.181) and shaft measurement for cross-reference.
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
