Lined Gate Valve Manufacturers for Concentrated Sulfuric Acid and Strong Acid Service – Corrosion Resistant
By combining the strength of a metal valve body with a fluoroplastic lining, these valves provide exceptional chemical resistance and long-term reliability in the most demanding corrosive service conditions .The main gate valve product names of China gate valve Network include:API Bellows gate valve,API Manual Lug&wafer Knife-shaped Gate Valve,Electric Wafer Knife-shaped Gate Valve,Electro-hydraulic Wafer Knife-shaped Gate Valve,Electric Slurry Valve,Manual Vacuum Isolated Wedge Gate Valve,Manual Welding Vacuum Wedge Gate Valve,Stainless Steel Flange Gate Valve,Wafer Bevel Gear Knife-shaped Gate Valve.
Why Lined Construction for Sulfuric Acid Service
Concentrated sulfuric acid is highly corrosive to standard carbon steel and even many stainless steel grades. Lined gate valves address this by lining all wetted parts—the valve body interior, gate surfaces, and stem—with fluoroplastics such as FEP (F46) or PFA. This isolates the metal substrate from the acid, providing reliable corrosion protection for strong acids, alkalis, and aggressive organic solvents .
FEP (F46) lining provides exceptional resistance to various concentrations of aqua regia, sulfuric acid, hydrochloric acid, hydrofluoric acid, organic acids, strong oxidizers, and strong alkalis at temperatures from -29°C to 150°C . For higher temperature applications, PFA lining extends capability to approximately 180°C .
Key Manufacturers
Shanghai Guanhuan Valve Manufacturing Co., Ltd offers Z41F46 flanged lined gate valves with FEP lining, designed for concentrated acid and sulfuric acid service. Their valves feature elastic gate design that compensates for wedge angle deviations, ensuring ideal sealing performance .
Jiangsu Dongzhizheng Valve Industry Co., Ltd produces Z41F46 lined gate valves with PTFE, PCTFE, FEP, and PFA lining options, available in cast iron, ductile iron, cast steel, and stainless steel body materials .
Zhejiang Jiangchen Valve Co., Ltd and Zhejiang Liangda Valve Manufacturing Co., Ltd are established manufacturers offering lined gate valves with extensive certification and quality control systems .
Technical Specifications
Lined gate valves are available in sizes from DN15 to DN500mm, with pressure ratings from PN0.6 to 4.0MPa . Standard FEP lining is rated for -29°C to 150°C, with PFA extending to higher temperatures . Design features include FEP-to-FEP sealing for low friction and reduced operating torque, bidirectional flow capability, and PTFE standard packing for reliable stem sealing .
Selection Considerations
When specifying a lined gate valve for sulfuric acid service, verify the lining material matches your acid concentration and operating temperature. FEP handles most concentrated acids to 150°C; for higher temperatures, specify PFA lining . Lined gate valves are designed for full open/close service only; throttling causes high-velocity erosion of the lining and must be avoided .
Summary
Lined gate valves are the preferred choice for concentrated sulfuric acid and strong acid service. Leading manufacturers offer FEP and PFA lined configurations with full certification. Selection requires careful evaluation of lining material, temperature rating, and pressure class based on specific service conditions. Consulting with qualified manufacturers who provide certified material documentation is strongly recommended for critical acid handling applications.
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