• Loose Face Fit: The seal face is loosely inserted into the driver, allowing it to self-align and reducing the risk of heat distortion transfer from the shaft.
• High-Pressure Capability: Capable of handling pressures up to 25 bar (or higher in special designs) due to its balanced nature and strong drive mechanism.
Key Features
• Universal Wave Spring Seal: The M7N is the modern industry standard for chemical and water pumps, featuring a wave spring and robust drive lugs.
• Super-Sinus Spring: Utilizes a specialized "Super-Sinus" wave spring that offers constant spring force over a wide working range and resists clogging.
• ISO/DIN Standard: Designed to fit standard DIN 24960 (EN 12756) seal chambers found in KSB, Sulzer, and Andritz pumps.
Technical Specs | Materials | ||
Mediums | Water, oil and weakly-corrosive mediums | Stationary Ring | Ceramic/Sic/TC |
Pressure | ≤1.0MPa | Rotary Ring | Carbon/Sic/TC |
Temperature | -20℃ to 120℃ | Secondary Seal | NBR/EPDM/Viton |
Speed | ≤15m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| D1 (mm) | Size Code | D3 | D7 | L1 | L4 |
| 8 | 0008 | 18.2 | 21.0 | 11.2 | 7.0 |
| 9 | 0009 | 18.2 | 24.0 | 16.2 | 7.0 |
| 10 | 0100 | 20.6 | 24.0 | 16.2 | 7.0 |
| 11 | 0110 | 20.6 | 24.0 | 16.2 | 7.0 |
| 12 | 0120 | 21.8 | 26.0 | 17.2 | 7.0 |
| 13 | 0130 | 21.8 | 26.0 | 17.2 | 7.0 |
| 14 | 0140 | 26.4 | 28.0 | 18.2 | 7.0 |
| 15 | 0150 | 26.4 | 28.0 | 18.2 | 7.0 |
| 16 | 0160 | 26.4 | 32.0 | 19.2 | 8.0 |
| 17 | 0170 | 29.5 | 32.0 | 19.2 | 8.0 |
| 18 | 0180 | 29.5 | 35.0 | 19.2 | 8.0 |
| 19 | 0190 | 29.5 | 35.0 | 19.2 | 8.0 |
| 20 | 0200 | 31.6 | 38.0 | 20.2 | 8.0 |
| 22 | 0220 | 33.6 | 40.0 | 20.2 | 8.0 |
| 25 | 0250 | 39.6 | 44.0 | 20.2 | 9.0 |
| 28 | 0280 | 45.0 | 46.0 | 21.2 | 9.0 |
| 30 | 0300 | 46.6 | 50.0 | 22.2 | 9.0 |
| 32 | 0320 | 46.6 | 54.0 | 24.2 | 9.0 |
| 35 | 0350 | 50.8 | 58.0 | 26.2 | 10.0 |
| 38 | 0380 | 54.3 | 60.0 | 27.2 | 10.0 |
| 40 | 0400 | 57.3 | 64.0 | 28.2 | 10.0 |
| 45 | 0450 | 61.3 | 66.0 | 30.2 | 10.0 |
| 50 | 0500 | 67.8 | 72.0 | 32.2 | 10.0 |
| 3/8" | 0095 | 23.50 | 22.23 | 22.20 | 6.40 |
| 1/2" | 0127 | 26.00 | 25.40 | 22.20 | 6.40 |
| 5/8" | 0158 | 30.00 | 31.75 | 23.80 | 8.70 |
| 3/4" | 0190 | 32.50 | 34.93 | 23.80 | 8.70 |
| 7/8" | 0222 | 37.50 | 38.10 | 25.40 | 8.70 |
| 1" | 0254 | 44.00 | 41.28 | 27.00 | 9.50 |
| 1 1/8" | 0286 | 48.00 | 44.45 | 28.60 | 9.50 |
| 1 1/4" | 0317 | 50.00 | 47.63 | 28.60 | 9.50 |
| 1 3/8" | 0349 | 54.50 | 50.80 | 30.20 | 9.50 |
| 1 1/2" | 0381 | 58.50 | 53.98 | 30.20 | 9.50 |
| 1 5/8" | 0412 | 64.00 | 60.33 | 36.50 | 11.10 |
| 1 3/4" | 0444 | 67.00 | 63.50 | 36.50 | 11.10 |
| 1 7/8" | 0476 | 71.00 | 66.68 | 39.70 | 11.10 |
| 2" | 0508 | 73.50 | 69.85 | 39.70 | 11.10 |
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
Chemical Process: A petrochemical plant needed to replace seals on 50 DIN standard process pumps. We supplied M7N replacements. The standardized fit made the overhaul easy, and the wave spring design resisted the dirty process water.
Testimonials
The M7N is the most versatile seal we stock. It fits almost every modern metric pump we see.
—Pump Distributor, Netherlands
FAQs about Metal Bellows Seals for High Temperature Pumps
Q: Is M7N the same as H7N?
A: They are very similar wave spring seals. M7N is the newer, optimized design with the Super-Sinus spring. H7N is the older version. Our M7N replacement often supersedes the H7N.
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
