Key Features

• No Dynamic O-Rings: The metal bellow provides the closing force and sealing, eliminating the most common failure point (O-ring hang-up) in high-heat applications. This advanced design is distinct from a single spring mechanical seal, which relies on dynamic O-rings for secondary sealing, making this solution superior in thermal cycling conditions.

• Self-Cleaning Bellow Action: The centrifugal force of the rotating bellow throws off solids and sludge, making it essentially non-clogging, a feature crucial for maintaining the long-term reliability of a cartridge mechanical seal in abrasive or slurry services.

• High-Temperature Resilience: Capable of operating up to 400°C (depending on the secondary graphite packing) without degradation, far exceeding the operational limits of a standard single spring mechanical seal that uses elastomeric O-rings.

• Uniform Face Loading: The welded leaflet design provides even closing force across the entire face, preventing uneven wear and leakage, which is a key engineered advantage in a robust cartridge mechanical seal assembly designed for high-duty cycles.

• Hastelloy Construction: Bellows are manufactured from Hastelloy® C-276 as standard, offering superior resistance to stress corrosion cracking compared to AM350, providing a material advantage that ensures longevity in corrosive environments where a cartridge mechanical seal is deployed.

Product Specifications

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 the part machining accuracy and production efficiency of components such as the single spring mechanical seal, meeting various high-specification manufacturing requirements.

Product Research, Development and Testing

Our Product R&D and Testing focuses on optimizing cartridge mechanical 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

FAQs about Metal Bellows Seals for High Temperature Pumps

Q: Why are metal bellows preferred over pusher seals for hot oil applications?

A: Pusher seals rely on a dynamic O-ring moving along the shaft, which often seizes ("hangs up") due to coke deposits or hardens due to heat degradation. Metal bellows eliminate this dynamic O-ring entirely, utilizing the flexible metal leaflets for axial movement. This removes the primary failure mode in high-temperature applications.