High Temperature Metal Bellows Mechanical Seal for Booster Pump
This booster pump mechanical seal is a specialized high-performance solution designed to handle elevated temperatures and demanding operational conditions. As a metal bellows mechanical seal, it replaces traditional elastomer secondary seals with a durable, all-metal welded bellows. This innovative construction eliminates the risk of elastomer failure under thermal stress, ensuring long-term reliability. Engineered specifically as a high temperature mechanical seal, it reliably operates in hot oil, boiler feed, and chemical applications.
Key Features
• High Speed & Pressure: Reinforced bellow geometry designed to withstand the pressure spikes and high RPMs (up to 4000 RPM) of booster service.
• Thermal Stability: Maintains face flatness even during rapid temperature cycling common in booster applications.
• Vibration Resistance: The bellow design accommodates the high-frequency vibration often found in multistage booster pumps.
• 45-Degree Tilt Edge: The bellow leaflets are welded at a 45-degree angle to disperse stress concentration, ensuring the bellow doesn't crack under high pressure pulsating loads.
• Balanced Hydraulic Design: Effectively balances the closing force to prevent face opening during pressure drops or vaporization.
Technical Specs | Materials | ||
Mediums | Oil, light hydrocarbon, aromatic hydrocarbon, organic solvents, weak acids, alkali, Ammonia, etc. | Stationary Ring | Sic/TC |
Temperature | -75℃ to 400℃ | Rotary Ring | Carbon/Sic/TC |
Pressure | ≤2.0MPa (Single), ≤6.0MPa (Double) | Secondary Seal | Graphite |
Speed | ≤23m/s | Spring and Metal Part | Stainless Steel |


Product Specifications
| Size/inch D1 | Size Code | D3 | L1 |
| 1.000 | 0254 | 41.28 | 38.89 |
| 1.125 | 0286 | 44.45 | 39.67 |
| 1.250 | 0317 | 47.63 | 40.46 |
| 1.375 | 0349 | 50.80 | 40.46 |
| 1.500 | 0381 | 53.98 | 40.46 |
| 1.625 | 0412 | 57.15 | 40.46 |
| 1.750 | 0444 | 60.33 | 41.28 |
| 1.875 | 0476 | 63.50 | 41.28 |
| 2.000 | 0508 | 66.68 | 42.06 |
| 2.125 | 0539 | 69.85 | 42.06 |
| 2.250 | 0571 | 73.03 | 43.66 |
| 2.375 | 0603 | 76.20 | 43.66 |
| 2.500 | 0635 | 82.55 | 44.45 |
| 2.625 | 0666 | 85.73 | 45.24 |
| 2.750 | 0698 | 88.90 | 45.24 |
| 2.875 | 0730 | 93.65 | 47.63 |
| 3.000 | 0762 | 96.82 | 47.63 |
| 3.125 | 0794 | 101.60 | 47.63 |
| 3.250 | 0826 | 104.78 | 47.63 |
| 3.375 | 0857 | 107.95 | 47.63 |
| 3.500 | 0889 | 111.13 | 47.63 |
| 3.625 | 0921 | 114.30 | 47.63 |
| 3.750 | 0953 | 117.48 | 47.63 |
| 3.875 | 0984 | 120.65 | 47.63 |
| 4.000 | 1016 | 123.83 | 47.63 |
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 booster pump mechanical 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 Feed Booster: A cogeneration plant's booster pump suffered from seal face opening during load changes. This high temperature mechanical seal stabilized the operation. Its balanced design kept the faces closed during pressure transients.
Testimonials
Perfect for our hot water booster skids. They handle the pressure shocks much better than standard pusher seals.
—OEM Pump Manufacturer, Italy
FAQs about High Temperature Metal Bellows Mechanical Seal for Booster Pump
Q: Can this handle low lubricity fluids like hot water?
A: Yes, hot water is a difficult lubricant. We recommend using Hot Water Carbon vs. Tungsten Carbide faces, as this combination resists the "washing out" of the binder in standard carbons.
Q: What are the primary advantages of using a metal bellows seal for a booster pump?
A: The metal bellows seal provides a compact, all-metal welded bellows that eliminates traditional rubber or elastomer secondary seals, which are vulnerable to degradation under high temperatures. This design allows the seal to handle thermal expansion, absorb shaft vibrations, and reliably operate in high-temperature applications (e.g., up to 425°C) without failure.
Q: How is this seal designed to maintain performance in a high temperature pump environment?
A: This metal bellows mechanical seal is engineered specifically for high-temperature use by utilizing materials resistant to heat and corrosion. Its flexible metal bellows structure adjusts to thermal expansion, preventing leakage and ensuring consistent sealing face loading. It is commonly used in boiler feed pumps, hot oil systems, and chemical applications where standard seals fail.









Our company is specialized in the production of sealing materials, mechanical seals , cartridge seals.
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