As a specialized water pump shaft seal replacement supplier, MiaoYu Seals produces the metal bellows seal as a direct drop-in alternative to Roten Type 37 / Type E on European boiler feed and HVAC water pumps. Built with Inconel welded bellows and TC/SiC vs carbon faces, it eliminates elastomer hang-up in 180–200 °C condensate return, giving routine maintenance crews an OEM-level fit at roughly one-third the Roten brand cost. Shaft coverage 18–150 mm (0.75"–6"), ≤2.0 MPa, ≤23 m/s, NBR/EPDM/FKM secondary seals—exactly dimensioned for pump-shaft retrofit without machining the stuffing box.
Key Features
• Direct Roten Replacement: Specifically engineered to replace Roten Type 37, Type E, or similar metal bellow models used in European boiler feed pumps.
• High-Grade Materials: Upgraded from standard materials to premium Inconel bellows and Tungsten Carbide faces for extended service life.
• Economical Repair Solution: Provides OEM-level performance at a fraction of the cost for routine boiler maintenance.
• Exact Dimensional Match: Replicates the working length and mounting dimensions of the Roten original, ensuring a drop-in fit without pump modification.
• Enhanced Bellow Strength: We use a high-density welding process that increases the fatigue strength of the bellow leaflets compared to standard commercial versions.
Technical Specs | Materials | ||
Mediums | Oil, light hydrocarbon, aromatic hydrocarbon, organicsolvents, weak acids, alkali, Ammonia, etc. | Stationary Ring | Sic/TC |
Temperature | 20℃ to 200℃ | Rotary Ring | Carbon/Sic/TC |
Pressure | ≤2.0MPa | Secondary Seal | NBR/EPDM/Viton |
Speed | ≤23m/s | Spring and Metal Part | Stainless Stee |
Product Specifications
| Size/Metric D1 | Size Code | D3 | L1 |
| 18 | 0180 | 32.0 | 27.5 |
| 20 | 0200 | 33.3 | 27.5 |
| 22 | 0220 | 36.0 | 27.5 |
| 24 | 0240 | 38.1 | 30.0 |
| 25 | 0250 | 39.0 | 30.0 |
| 28 | 0280 | 42.0 | 32.5 |
| 30 | 0300 | 44.0 | 32.5 |
| 32 | 0320 | 46.0 | 32.5 |
| 33 | 0330 | 47.0 | 32.5 |
| 35 | 0350 | 49.2 | 32.5 |
| 38 | 0380 | 52.4 | 34.0 |
| 40 | 0400 | 55.6 | 34.0 |
| 43 | 0430 | 58.7 | 34.0 |
| 45 | 0450 | 58.7 | 34.0 |
| 48 | 0480 | 61.9 | 34.0 |
| 50 | 0500 | 65.1 | 34.5 |
| 53 | 0530 | 68.3 | 34.5 |
| 55 | 0550 | 71.0 | 34.5 |
| 60 | 0600 | 74.6 | 39.5 |
| 65 | 0650 | 84.1 | 39.5 |
| 70 | 0700 | 87.3 | 45.0 |
| 75 | 0750 | 95.3 | 45.0 |
| 80 | 0800 | 98.4 | 44.5 |
| 85 | 0850 | 104.8 | 44.5 |
| 90 | 0900 | 108.0 | 49.5 |
| 95 | 0950 | 114.3 | 49.5 |
| 100 | 1000 | 120.7 | 49.5 |
| 105 | 1050 | 131.7 | 48.3 |
| 110 | 1100 | 138.1 | 48.3 |
| 115 | 1150 | 144.5 | 48.3 |
| 120 | 1200 | 144.5 | 48.3 |
| 125 | 1250 | 150.8 | 48.3 |
| 130 | 1300 | 157.8 | 48.3 |
| 140 | 1400 | 170.5 | 48.3 |
| 150 | 1500 | 176.9 | 48.3 |
| 0.750 | 0191 | 33.32 | 31.75 |
| 0.875 | 0222 | 36.50 | 31.75 |
| 0.937 | 0238 | 38.10 | 31.75 |
| 1.000 | 0254 | 39.67 | 31.75 |
| 1.125 | 0286 | 42.85 | 31.75 |
| 1.250 | 0317 | 46.02 | 33.32 |
| 1.375 | 0349 | 49.20 | 36.50 |
| 1.500 | 0381 | 52.37 | 36.50 |
| 1.625 | 0412 | 55.55 | 36.50 |
| 1.750 | 0444 | 58.72 | 36.50 |
| 1.875 | 0476 | 61.90 | 38.10 |
| 2.000 | 0508 | 65.07 | 38.10 |
| 2.125 | 0539 | 68.25 | 38.10 |
| 2.250 | 0571 | 71.42 | 39.67 |
| 2.375 | 0603 | 74.60 | 39.67 |
| 2.500 | 0635 | 80.95 | 39.67 |
| 2.625 | 0666 | 84.12 | 41.28 |
| 2.750 | 0698 | 87.30 | 41.28 |
| 2.875 | 0730 | 92.08 | 42.85 |
| 3.000 | 0762 | 95.25 | 42.85 |
| 3.125 | 0794 | 98.43 | 44.45 |
| 3.250 | 0826 | 101.60 | 44.45 |
| 3.375 | 0857 | 104.78 | 44.45 |
| 3.500 | 0889 | 107.95 | 47.63 |
| 3.625 | 0921 | 111.13 | 47.63 |
| 3.750 | 0953 | 114.30 | 47.63 |
| 3.875 | 0984 | 117.48 | 47.63 |
| 4.000 | 1016 | 120.65 | 47.63 |
| 4.250 | 1080 | 131.75 | 48.34 |
| 4.500 | 1143 | 138.13 | 48.34 |
| 4.750 | 1207 | 144.48 | 48.34 |
| 5.000 | 1270 | 150.70 | 48.34 |
| 5.250 | 1334 | 157.81 | 48.34 |
| 5.500 | 1397 | 164.16 | 48.34 |
| 5.750 | 1461 | 170.54 | 48.34 |
| 6.000 | 1524 | 176.89 | 48.34 |
Workshop
Equipped with CNC lathes, bellows welding fixtures and standardized material warehousing, our shop runs one-site control from Inconel leaflet welding to face lapping and pressure trial. For every water pump shaft seal replacement we produce, thermal cycling and runout simulation are mandatory before shipment, so boiler-room MRO buyers get consistent bellow fatigue strength and batch traceability instead of trading-company guesswork.
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
Industrial Laundry: A large laundry facility used Roten seals on their steam boiler feed pumps. Frequent failures occurred. We supplied our compatible Metal Bellows Seal with upgraded TC faces. The new seals resist the abrasive particles in the condensate return, doubling seal life.
Testimonials
Fits our Grundfos and Lowara pumps that used Roten seals perfectly. Great quality and stock availability.
—Spare Parts Manager, HVAC Service Co.
FAQs
Q: How do I identify if I have a Roten seal?
A: Roten seals often have distinctive markings or a specific "Type 37" look with a short metal bellow. Send us a photo, and our engineers can identify it instantly.
Q:Why buy Model 680 as your water pump shaft seal replacement from MiaoYu?
A:Because we are a direct factory with ISO 9001, RoHS, UL and CE discipline in-house. You get factory pricing, 24-hour drawing review, and drop-in dimensions for Roten Type 37 / E boiler feed shafts (18–150 mm)—without paying the Roten OEM brand premium. Private-label and annual-frame contracts are supported.
Looking for a reliable water pump shaft seal replacement for Roten Type 37 / E boiler feed pumps (18–150 mm shaft, Inconel bellows)? Send your pump tag or old-seal photo—our engineers return a quote within 24 hours.
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
