• Isolated Spring Design: Springs are located outside the fluid in many configurations to prevent them from annealing or clogging in hot, dirty media.
• Face Material Selection: We pair these seals with Hot Water Carbon or Sintered SiC faces that maintain flatness even under thermal stress.
Key Features
• High-Temp Elastomers: Utilizes advanced FKM (Viton®), AFLAS®, or FFKM (Kalrez® equivalent) O-rings to withstand temperatures up to 280°C without hardening or compression set.
• Thermal Expansion Compensation: The seal design includes clearances that accommodate the thermal growth of the shaft and housing at elevated temperatures.
• Heat Dissipation: Face geometry is optimized to promote fluid film formation, preventing dry running heat spikes.
Technical Specs | Materials | ||
Mediums | Water, oil, acids, alkali, etc. | Stationary Ring | Carbon/Sic/TC |
Pressure | ≤1.2MPa | Rotary Ring | Carbon/Sic/TC/SUS304 |
Temperature | -30℃ to 200℃ | Secondary Seal | NBR/EPDM/Viton |
Speed | ≤18m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| Metric Shaft Size D1 | Size Code | D3 | D7 | L1 | L4 |
| 14 | 0140 | 25.00 | 25.00 | 25.00 | 10.00 |
| 16 | 0160 | 27.00 | 27.00 | 25.00 | 10.00 |
| 18 | 0180 | 33.00 | 33.00 | 26.00 | 11.50 |
| 20 | 0200 | 35.00 | 35.00 | 26.00 | 11.50 |
| 22 | 0220 | 37.00 | 37.00 | 26.00 | 11.50 |
| 24 | 0240 | 39.00 | 39.00 | 28.50 | 11.50 |
| 25 | 0250 | 40.00 | 40.00 | 28.50 | 11.50 |
| 28 | 0280 | 43.00 | 43.00 | 31.00 | 11.50 |
| 30 | 0300 | 45.00 | 45.00 | 31.00 | 11.50 |
| 32 | 0320 | 47.00 | 47.00 | 31.00 | 11.50 |
| 33 | 0330 | 48.00 | 48.00 | 31.00 | 11.50 |
| 35 | 0350 | 50.00 | 50.00 | 31.00 | 11.50 |
| 38 | 0380 | 55.00 | 56.00 | 31.00 | 14.00 |
| 40 | 0400 | 57.00 | 58.00 | 31.00 | 14.00 |
| 43 | 0430 | 60.00 | 61.00 | 31.00 | 14.00 |
| 45 | 0450 | 62.00 | 63.00 | 31.00 | 14.00 |
| 48 | 0480 | 65.00 | 66.00 | 31.00 | 14.00 |
| 50 | 0500 | 67.00 | 70.00 | 32.50 | 15.00 |
| 53 | 0530 | 70.00 | 73.00 | 32.50 | 15.00 |
| 55 | 0550 | 72.00 | 75.00 | 32.50 | 15.00 |
| 58 | 0580 | 79.00 | 78.00 | 37.50 | 15.00 |
| 60 | 0600 | 81.00 | 80.00 | 37.50 | 15.00 |
| 63 | 0630 | 84.00 | 83.00 | 37.50 | 15.00 |
| 65 | 0650 | 86.00 | 85.00 | 37.50 | 15.00 |
| 68 | 0680 | 89.00 | 90.00 | 34.50 | 18.00 |
| 70 | 0700 | 91.00 | 92.00 | 42.00 | 18.00 |
| 75 | 0750 | 99.00 | 97.00 | 42.00 | 18.00 |
| 80 | 0800 | 104.00 | 105.00 | 41.80 | 18.20 |
| 85 | 0850 | 109.00 | 110.00 | 41.80 | 18.20 |
| 90 | 0900 | 114.00 | 115.00 | 46.80 | 18.20 |
| 95 | 0950 | 119.00 | 120.00 | 47.80 | 17.20 |
| 100 | 1000 | 124.00 | 125.00 | 47.80 | 17.20 |
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
Boiler Condensate Pump: Standard EPDM seals were failing every 3 months in a 140°C condensate return line. We upgraded to this seal with AFLAS O-rings and Hot Water Carbon faces. The new seals have lasted over 18 months.
Testimonials
Finally, an O-ring seal that doesn't turn into hard plastic after a month in our hot water system.
—Facility Manager, District Heating
FAQs about Metal Bellows Seals for High Temperature Pumps
Q: At what temperature should I switch from FKM to FFKM?
A: Standard FKM (Viton®) is generally good up to 200°C. Above that, or if steam is present, we recommend FFKM (Perfluoroelastomer) or AFLAS® to prevent chemical degradation and seal failure.
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
