• Buffer Fluid Potential: The space between seals can be filled with a buffer fluid to lubricate the faces and prevent crystallization of foam concentrates.
• Corrosion Resistant Alloys: Available in Duplex or Monel for seawater fire pumps on offshore platforms.
Key Features
• Safety Backup: The secondary seal acts as a safety net, containing leaks and allowing the pump to finish its critical mission.
• Foam/Chemical Resistance: PTFE wedges are essential for sealing aggressive fire-fighting foam concentrates that dissolve standard rubber.
• Robust Construction: Heavy-duty drive mechanism ensures start-up reliability after long dormant periods.
Technical Specs | Materials | ||
Mediums | Petroleum, chemical solvents, medium corrosion. | Stationary Ring | Ceramic/Sic/TC |
Temperature | 30℃ to 200℃ | Rotary Ring | Carbon/Sic/TC |
Pressure | ≤2.5MPa | Secondary Seal | PTFE |
Speed | ≤25m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| Inch Shaft Size D1 | Size Code | D1 | D2 | D3 | D7 | L1 | L4 | L3 |
| 0.625 | 0158 | 15.87 | 12.7 | 30.7 | 25.40 | 27 | 7.95 | 4.8 |
| 0.750 | 0191 | 19.05 | 15.9 | 34.0 | 31.75 | 30 | 10.3 | 4.8 |
| 0.875 | 0222 | 22.22 | 19.1 | 37.2 | 34.93 | 32 | 10.3 | 6.4 |
| 1.000 | 0254 | 25.40 | 22.2 | 40.3 | 38.10 | 33 | 10.3 | 6.4 |
| 1.125 | 0286 | 28.58 | 25.4 | 43.5 | 41.28 | 35 | 11.1 | 7.9 |
| 1.250 | 0317 | 31.75 | 28.6 | 48.3 | 44.45 | 35 | 11.1 | 7.9 |
| 1.375 | 0349 | 34.93 | 28.6 | 51.5 | 44.45 | 37 | 11.1 | 8.7 |
| 1.500 | 0381 | 38.10 | 31.8 | 54.6 | 47.63 | 37 | 11.1 | 8.7 |
| 1.625 | 0412 | 41.28 | 34.9 | 61.0 | 50.80 | 45 | 11.1 | 8.7 |
| 1.750 | 0444 | 44.45 | 38.1 | 64.2 | 53.98 | 45 | 11.1 | 9.5 |
| 1.875 | 0476 | 47.62 | 41.3 | 67.3 | 60.33 | 45 | 12.7 | 9.5 |
| 2.000 | 0508 | 50.80 | 44.5 | 70.5 | 63.50 | 45 | 12.7 | 9.5 |
| 2.125 | 0539 | 53.98 | 47.6 | 76.9 | 66.68 | 52 | 12.7 | 11.1 |
| 2.250 | 0571 | 57.15 | 50.8 | 80.0 | 69.86 | 52 | 12.7 | 11.1 |
| 2.375 | 0603 | 60.33 | 54.0 | 83.2 | 76.20 | 52 | 14.3 | 11.1 |
| 2.500 | 0635 | 63.50 | 57.2 | 86.4 | 79.38 | 52 | 14.3 | 11.1 |
| 2.625 | 0666 | 66.68 | 60.3 | 89.6 | 82.55 | 52 | 14.3 | 11.1 |
| 2.750 | 0698 | 69.85 | 63.5 | 92.7 | 85.73 | 52 | 14.3 | 11.1 |
| 2.875 | 0730 | 73.03 | 66.7 | 95.9 | 85.73 | 52 | 14.3 | 11.1 |
| 3.000 | 0762 | 76.20 | 69.9 | 97.5 | 88.90 | 52 | 15.9 | 11.1 |
| 3.125 | 0794 | 79.38 | 73.0 | 100.7 | 95.25 | 52 | 15.9 | 11.1 |
| 3.250 | 0825 | 82.55 | 76.2 | 105.4 | 98.43 | 52 | 15.9 | 14.3 |
| 3.375 | 0857 | 85.73 | 79.4 | 108.6 | 101.60 | 52 | 19.8 | 14.3 |
| 3.500 | 0889 | 88.90 | 82.6 | 111.8 | 104.78 | 52 | 19.8 | 14.3 |
| 3.625 | 0921 | 92.08 | 85.7 | 115.0 | 107.95 | 52 | 19.8 | 14.3 |
| 3.750 | 0953 | 95.25 | 88.9 | 118.1 | 111.13 | 52 | 19.8 | 14.3 |
| 3.875 | 0984 | 98.43 | 92.1 | 121.3 | 114.30 | 52 | 19.8 | 14.3 |
| 4.000 | 1016 | 101.60 | 95.3 | 124.5 | 117.48 | 52 | 19.8 | 14.3 |
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
Offshore Platform: Fire pumps handling seawater and foam concentrate faced corrosion issues. We supplied Tandem PTFE Wedge Seals in Monel. The tandem design allows for monitoring, and the PTFE resists the foam chemicals.
Testimonials
For our foam proportioning pumps, we only trust these tandem PTFE seals. They handle the harsh chemicals and give us a safety margin.
—Fire Systems Engineer, Oil & Gas
FAQs about Metal Bellows Seals for High Temperature Pumps
Q: Why PTFE for fire pumps?
A: While water pumps use rubber, pumps handling fire-fighting foam concentrates require PTFE because the foam agents can chemically attack and swell standard NBR or EPDM O-rings, causing seizure.
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
