Concentrated sulfuric acid is highly corrosive. Lined gate valves address this by lining all wetted parts—body, gate, and stem—with fluoroplastics like FEP (F46) or PFA. This isolates the metal from the acid, providing reliable corrosion protection. It is designed for strong acids, alkalis, and other aggressive media.The main gate valves product names of China gate Valve Network include:Manual Welding Vacuum Wedge Gate Valve,Manual Wedge Gate Valve ,With Purge HoleNon-rising Stem Resilient Seat Seal Gate Valve,Non-rising Stem Wedge Cast Iron Gate Valve,Non-rising Stem Buried Wedge Gate Valve,Oversized Soft Sealing Gate Valve,Pneumatic Wafer Knife-shaped Gate Valve,Pneumatic Wear-resistant Ceramic Discharge Gate Valve,Rising Stem Resilient Seat Seal Gate Valve

Key Design Features

Full lining – All wetted parts are lined with FEP, PFA, or PTFE.

Resilient gate – Compensates for wedge angle deviations, ensuring a tight seal. Designed for on/off service only, not throttling.

Low friction – FEP-to-FEP sealing reduces operating torque.

Bidirectional – Suitable for lines where flow direction may change.

Selection Parameters

Size (DN): Commonly DN15–DN500mm.

Pressure (PN): Typically PN0.6–4.0MPa.

Temperature: FEP-lined valves are rated for -29°C to 150°C. Exceeding this limit softens the lining. For higher temperatures, specify PFA lining.

Chemical resistance: FEP resists aqua regia, sulfuric, hydrochloric, and hydrofluoric acids in various concentrations.

Key Usage Tips

Respect the temperature limit – Standard FEP lining is rated to 150°C. Use PFA for higher temperatures.

Keep media clean – Avoid media with hard particles that can scratch the lining.

No throttling – Use only for full open/close. Throttling erodes the seat.

Conclusion

The lined gate valve is the preferred choice for concentrated sulfuric acid and strong acid services. By combining the strength of metal with the inertness of fluoroplastics, it delivers long-term, leak-free performance in the most aggressive environments.

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