• Non-Clogging: The open coil spring design resists clogging, making it suitable for both clean sanitary fluids and slightly turbid domestic water.
• Shaft Protection: The rubber bellow covers the shaft, protecting it from corrosion and eliminating the need for shaft sleeves in smaller pumps.
Key Features
• Versatile Rubber Bellow: A universal rubber bellows mechanical seal designed to fit a wide range of pumps, from sanitary Alfa Laval centrifugal pumps to compact domestic Tullu water pumps.
• Sanitary & Utility Compatible: Available with FDA-compliant EPDM for sanitary applications (Alfa Laval) or robust NBR for general water duties (Tullu).
• Compact & Reliable: The single coil spring and elastomer bellow design provides a reliable seal in a very compact axial space.
Technical Specs | Materials | ||
Mediums | Water, oil and weakly-corrosive mediums | Stationary Ring | Ceramic/Sic/TC |
Pressure | ≤1.2MPa | Rotary Ring | Carbon/Sic/TC |
Temperature | -20℃ to 120℃ | Secondary Seal | NBR/EPDM/Viton |
Speed | ≤12m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| D1 (mm) | Size Code | D3 | D7 | L4 | L1 | L11 | L12 |
| 10 | 0100 | 22.50 | 21.00 | 6.60 | 14.50 | 25.90 | 33.40 |
| 12 | 0120 | 25.00 | 23.00 | 6.60 | 15.00 | 25.90 | 33.40 |
| 14 | 0140 | 28.50 | 25.00 | 6.60 | 17.00 | 28.40 | 33.40 |
| 15 | 0150 | 28.50 | 27.00 | 6.60 | 17.00 | 28.40 | 33.40 |
| 16 | 0160 | 28.50 | 27.00 | 6.60 | 17.00 | 28.40 | 33.40 |
| 18 | 0180 | 32.00 | 33.00 | 7.50 | 19.50 | 30.00 | 37.50 |
| 20 | 0200 | 37.00 | 35.00 | 7.50 | 21.50 | 30.00 | 37.50 |
| 22 | 0220 | 37.00 | 37.00 | 7.50 | 21.50 | 30.00 | 37.50 |
| 24 | 0240 | 42.50 | 39.00 | 7.50 | 22.50 | 32.50 | 42.50 |
| 25 | 0250 | 42.50 | 40.00 | 7.50 | 23.00 | 32.50 | 42.50 |
| 28 | 0280 | 49.00 | 43.00 | 7.50 | 26.50 | 35.00 | 42.50 |
| 30 | 0300 | 49.00 | 45.00 | 7.50 | 26.50 | 35.00 | 42.50 |
| 32 | 0320 | 53.50 | 48.00 | 7.50 | 27.50 | 35.00 | 47.50 |
| 33 | 0330 | 53.50 | 48.00 | 7.50 | 27.50 | 35.00 | 47.50 |
| 35 | 0350 | 57.00 | 50.00 | 7.50 | 28.50 | 35.00 | 47.50 |
| 38 | 0380 | 59.00 | 56.00 | 9.00 | 30.00 | 36.00 | 46.00 |
| 40 | 0400 | 62.00 | 58.00 | 9.00 | 30.00 | 36.00 | 46.00 |
| 43 | 0430 | 65.50 | 61.00 | 9.00 | 30.00 | 36.00 | 51.00 |
| 45 | 0450 | 68.00 | 63.00 | 9.00 | 30.00 | 36.00 | 51.00 |
| 48 | 0480 | 70.50 | 66.00 | 9.00 | 30.50 | 36.00 | 51.00 |
| 50 | 0500 | 74.00 | 70.00 | 9.50 | 30.50 | 38.00 | 50.50 |
| 53 | 0530 | 78.50 | 73.00 | 11.00 | 33.00 | 36.50 | 59.00 |
| 55 | 0550 | 81.00 | 75.00 | 11.00 | 35.00 | 36.50 | 59.00 |
| 58 | 0580 | 85.50 | 78.00 | 11.00 | 37.00 | 41.50 | 59.00 |
| 60 | 0600 | 88.80 | 80.00 | 11.00 | 38.00 | 41.50 | 59.00 |
| 65 | 0650 | 93.50 | 85.00 | 11.00 | 40.00 | 41.50 | 69.00 |
| 68 | 0680 | 96.50 | 90.00 | 11.30 | 40.00 | 41.20 | 68.70 |
| 70 | 0700 | 99.50 | 92.00 | 11.30 | 40.00 | 48.70 | 68.70 |
| 75 | 0750 | 107.00 | 97.00 | 11.30 | 40.00 | 48.00 | 68.70 |
| 80 | 0800 | 112.00 | 105.00 | 12.00 | 40.00 | 48.00 | 78.00 |
| 85 | 0850 | 120.00 | 110.00 | 14.00 | 41.00 | 46.00 | 76.00 |
| 90 | 0900 | 127.00 | 115.00 | 14.00 | 45.00 | 51.00 | 76.00 |
| 95 | 0950 | 132.00 | 120.00 | 14.00 | 46.00 | 51.00 | 76.00 |
| 100 | 1000 | 137.00 | 125.00 | 14.00 | 47.00 | 51.00 | 76.00 |
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
Food Processing & Utility: A facility used Alfa Laval pumps for process and Tullu pumps for washdown. We standardized their inventory with this versatile rubber bellow seal design (changing materials as needed). It simplified stock and reduced confusion.
Testimonials
Fits our little Tullu pumps perfectly and we use the FDA version for our sanitary loop backup pumps. Very versatile." — Maintenance Lead, Beverage Plant
FAQs about Metal Bellows Seals for High Temperature Pumps
Q: Are these the same seal for both pumps?
A: The design principle (rubber bellow) is the same, but the dimensions and materials differ. We supply the specific size and material grade (FDA vs. Standard) based on your pump model (Alfa or Tullu).
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
