How Does the FSB Centrifugal Pump Achieve Zero Corrosion Operation in Corrosive Chemical Industries?
2025-11-14 15:47:36
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FSB series fluorine plastic centrifugal pumps are suitable for highly corrosive chemical applications, as all corrosion-prone components are manufactured from fluoroplastic. This design completely isolates the most vulnerable metal contact points found in traditional centrifugal pumps, combining the strength of metal piping with the corrosion resistance of plastic piping to withstand corrosive operating conditions.
All components of this pump that may come into contact with liquid media—including the pump casing, impeller, pump cover, and shaft sleeve—are manufactured using metal inserts encapsulated in F46 (polyfluoroethylene propylene) or fluoroplastic, formed through integral sintering. On one hand, the dense outer fluoroplastic layer, free of pinholes, resists corrosion from acids, alkalis, salts, and strong oxidizing agents at any concentration. On the other hand, the inner metal layer prevents mechanical strength from being exposed to the medium, thereby completely eliminating the risk of intergranular corrosion or stress corrosion cracking. Meanwhile, the cast iron machine casing withstands pipeline stress, impact, and motor loads. This design enables higher pressure resistance than all-plastic pumps, while also offering superior temperature resistance and aging resistance compared to traditional rubber-lined pumps.
To enhance the corrosion resistance of the FSB series centrifugal pumps, an externally mounted PTFE bellows mechanical seal is employed for the shaft seal. This features a ceramic stationary ring paired with a PTFE-filled rotating ring, delivering both corrosion resistance and wear resistance. The bellows' elasticity compensates for shaft runout, enabling operation in particulate-laden media without cooling water. This achieves near-zero emissions of leaks, spills, drips, and blowouts, meeting the most stringent environmental and safety requirements in the chemical industry.
Under normal circumstances, traditional gear pumps struggle to achieve high head when conveying low-viscosity corrosive fluids due to large clearances and severe internal leakage. However, this equipment employs precision-ground gears and bearing sleeves to control end-face clearance at approximately 0.02 mm. By incorporating fluoroplastic self-lubricating properties, it reduces fluid leakage while preventing dry friction, enabling high-head operation and extended service life.
In summary, the FSB series chemical centrifugal pump can continuously convey corrosive media such as sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia, and chlorobenzene under harsh operating conditions. They have progressively become the “corrosion-resistant heart” in chemical, pharmaceutical, and electroplating processes.
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