The Roten mechanical seal is a heavy-duty sealing solution engineered specifically for the extreme conditions of boiler feed systems. Boiler feed water pump mechanical seal is designed as a direct replacement for Roten Type 37, Type E, and similar metal bellows seals commonly found in European-made pumps. This seal features a welded metal bellows construction that eliminates elastomeric O-rings in the primary sealing area, making it immune to the hardening and hang-up failures caused by high-temperature condensate (typically 180–280°C).
Key Features
• High-Temp Roten: A specialized metal bellows seal designed to replace Roten Type 37, Type E, or similar metal bellow models used in European boiler feed pumps.
• No Rubber Parts: Eliminates temperature-sensitive elastomers, using static graphite gaskets and a welded metal bellow to withstand boiler condensate temperatures up to 280°C.
• Long Life: The metal bellow construction eliminates the "hang-up" failure mode caused by O-ring vulcanization in hot water.
• Fatigue Resistance: We use a high-density welding process for the bellow leaflets, increasing fatigue strength against the vibration and pressure pulsations of boiler feed pumps.
• Exact Dimensional Match: Replicates the working length (L1k) of the Roten original for a drop-in fit.
Product Specifications
| Size Metric | D1 | D2 | D3 | L1 | L2 | L3 |
| 10 | 19.2 | 15.5 | 19 | 15.5 | 6.6 | 5 |
| 12 | 21.6 | 17.5 | 21 | 15.5 | 5.6 | 5 |
| 14 | 24.6 | 20.5 | 23 | 15.5 | 5.6 | 5 |
| 15 | 24.6 | 20.5 | 24 | 15.5 | 6.6 | 5 |
| 16 | 28 | 22 | 26 | 17.5 | 7.5 | 6.5 |
| 18 | 30 | 24 | 29 | 18.5 | 8 | 6.5 |
| 19 | 31 | 25 | 31 | 20 | 7.5 | 6.5 |
| 20 | 35 | 29.5 | 31 | 20 | 7.5 | 6.5 |
| 22 | 35 | 29.5 | 33 | 21.5 | 7.5 | 6.5 |
| 24 | 38 | 32 | 35 | 23 | 7.5 | 6.5 |
| 25 | 38 | 32 | 36 | 24.5 | 7.5 | 6.5 |
| 26 | 40 | 34 | 37 | 24.5 | 8 | 6.5 |
| 28 | 42 | 36 | 40 | 24.5 | 9 | 6.5 |
| 30 | 45 | 39.2 | 43 | 24.5 | 10.5 | 6.5 |
| 32 | 48 | 42.2 | 46 | 28 | 10.5 | 6.5 |
| 35 | 52 | 46.2 | 49 | 28 | 11 | 6.5 |
| 38 | 55 | 49.2 | 53 | 31 | 10.3 | 6.5 |
| 40 | 58 | 52.2 | 56 | 34 | 10.8 | 6.5 |
| 42 | 62 | 53.3 | 59 | 35 | 12 | 8 |
| 43 | 62 | 54.3 | 59 | 35 | 12 | 8 |
| 45 | 64 | 55.3 | 61 | 36.5 | 11.6 | 8 |
| 48 | 68 | 59.7 | 64 | 42 | 11.6 | 8 |
| 50 | 69 | 60.8 | 66 | 43 | 11.6 | 8.5 |
| 55 | 75.4 | 66.5 | 71 | 47 | 13.3 | 8.5 |
| 58 | 78.4 | 69.5 | 76 | 50 | 13.3 | 8.5 |
| 60 | 80.4 | 71.5 | 78 | 51 | 13.3 | 8.5 |
| 65 | 85.4 | 76.5 | 84 | 52 | 13 | 8.5 |
| 68 | 91.5 | 82.7 | 88 | 53 | 13.7 | 9.5 |
| 70 | 92 | 83 | 90 | 54 | 13 | 9.5 |
| 75 | 99 | 92.2 | 98 | 55 | 14 | 9.5 |
| 80 | 104 | 95.2 | 100 | 58 | 15 | 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
Steam Boiler: A hospital's boiler feed pump was leaking every 6 months. We replaced the elastomer seal with this Roten-compatible Metal Bellows Seal. It has now run for 3 years without leakage, handling the 180°C condensate effortlessly.
Testimonials
Fits our Grundfos and Lowara boiler pumps perfectly. The metal bellow is the only thing that survives the condensate return.
—Facility Manager, Hospital
FAQs about Roten mechanical seal for Boiler Feed Water Pump
Q: How do I identify a Roten metal bellow?
A: They typically look like a standard Roten seal but with a corrugated metal tube instead of a rubber bellow. Look for model numbers like "Type 37" or "Type E".
Q: Why is a metal bellows design recommended for boiler feed water pumps?
A: Boiler feed water often operates at high temperatures (typically 150–280°C). Standard elastomer O-rings in standard seals can harden, crack, or "hang up" under these conditions. The all-metal bellows construction eliminates these vulnerable rubber parts, providing superior reliability and a longer service life in high-temperature steam and condensate environments.
Q: Which Roten models does this seal replace?
A: This replacement seal is dimensionally compatible with Roten Type 37, Type E, and similar metal bellows seals commonly used in European boiler feed pumps (e.g., Grundfos, KSB). To confirm the exact match, provide your pump model or the shaft diameter and existing seal housing dimensions.
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
