In industries such as chemical processing, pharmaceuticals, electroplating, and metallurgy, valves are often exposed to highly corrosive media such as strong acids and alkalis. Conventional metal valve bodies can hardly withstand these conditions for long periods. To extend service life and ensure safe system operation, the PTFE Lined Globe Valve has become the preferred solution for many users. With its exceptional corrosion resistance and reliable sealing design, it performs excellently even under harsh and aggressive process conditions.
The PTFE Lined Globe Valve is based on a standard metal globe valve, with key wetted components—such as the valve body, bonnet, disc, and seat—lined with fluoroplastics like PTFE, FEP, or PFA.
These materials possess outstanding chemical inertness and do not react with most chemical substances, effectively isolating the process medium from the metal parts and preventing corrosion.
When the valve is closed, the disc moves downward along the valve seat axis to achieve a tight seal. Thanks to the self-lubricating and low-friction characteristics of fluoroplastics, the lined globe valve ensures smooth operation and reliable sealing performance, even in applications involving frequent opening and closing.
PTFE Lined Globe Valves can handle a wide range of corrosive fluids. The main applicable media include:
1. Strong Acids
Suitable for hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid, and similar media.
In extremely corrosive environments, such as concentrated sulfuric acid (98%) or hydrofluoric acid, conventional metal valves may suffer severe corrosion within months, whereas PTFE-lined valves can operate reliably for many years.
2. Strong Alkalis
Applicable for sodium hydroxide, potassium hydroxide, and other alkaline chemicals. Widely used in systems such as pulp and paper processing, flue gas desulfurization, and alkali recovery.
3. Oxidizing Media
Including sodium hypochlorite, hydrogen peroxide, and fuming nitric acid. The PTFE lining effectively resists oxidation reactions, preventing metal ion leaching or structural corrosion.
4. Organic Solvents and Mixed Chemicals
Suitable for alcohols, ketones, ethers, esters, phenols, and other organic compounds. Frequently used in pharmaceutical and fine chemical production lines to ensure high-purity fluid handling.
The operating temperature of PTFE Lined Globe Valves primarily depends on the lining material:
PTFE (Polytetrafluoroethylene): Suitable for -29℃ to +180℃
FEP / PFA (Modified Fluoropolymers): Can withstand temperatures up to +200℃
Typical design pressures range from PN10 to PN16, making them suitable for low-pressure, medium-temperature corrosive fluid systems. For conditions exceeding these limits, it is recommended to use metal alloy valves or specially coated valves to ensure long-term sealing and safety.
Thanks to their excellent corrosion resistance, PTFE Lined Globe Valves are widely used in:
Acid-base neutralization and chemical transfer systems in chemical production lines
Reaction medium control in pharmaceutical and fine chemical processes
Electroplating, metal surface treatment, and pickling systems
Environmental protection equipment, including waste liquid, acid mist, and exhaust gas purification systems
Metallurgical industry, for wet process metallurgy and metal extraction operations
These applications generally demand high reliability and long-term corrosion resistance, making PTFE Lined Globe Valves particularly suitable for such environments.
Avoid excessive operating torque
Excessive torque may deform the lining or bend the valve stem.
Keep pipelines clean
Prevent solid particles from entering the valve to avoid scratching or damaging the lining.
Protect valves during long-term shutdowns
Apply protective oil inside the valve cavity and store in a dry environment to prevent lining aging.
Regularly inspect sealing performance
Especially in strong acid or alkali systems, perform routine sealing tests and replace aged components promptly.
Q1: Can PTFE Lined Globe Valves be used in high-temperature strong acid systems?
A: Yes, but it is recommended to use PFA lining, which offers higher temperature resistance suitable for high-temperature concentrated acid applications.
Q2: Can PTFE Lined Globe Valves be installed in vacuum pipelines?
A: Not recommended. Fluoropolymers may allow slight gas permeation under high vacuum, affecting sealing performance.
Q3: What is the typical service life of a PTFE Lined Globe Valve?
A: Under normal conditions, valves can operate reliably for 5–10 years. If the medium is clean and the opening/closing frequency is low, the service life can be even longer.
Q4: What should be considered during installation?
A: Flange bolts should be tightened evenly to avoid damaging the lining. Ensure the flow direction matches the valve body arrow.
PTFE Lined Globe Valves, with their outstanding corrosion resistance, reliable sealing, and broad medium compatibility, have become essential equipment in chemical and pharmaceutical industries. Proper selection and routine maintenance not only extend valve life but also significantly enhance system safety and operational stability.
