A PTFE-lined diaphragm valve is a special type of shut-off valve. Its opening and closing element uses a soft diaphragm made of rubber or fluoroplastic to isolate the valve body from the drive components, preventing media corrosion and eliminating the risk of external leakage. This valve is mainly used in chemical and pharmaceutical industries, suitable for low-pressure environments ≤1.6MPa and temperature ranges from -50℃ to +150℃. It can handle corrosive media such as strong acids and strong alkalis, but is not suitable for organic solvents or high-temperature, high-pressure applications.
GNEE Group has been manufacturing PTFE lined diaphragm valves for 18 years, providing valve solutions to more than 150 countries and regions worldwide. Contact us for a valve engineering quote.
PTFE Lined Diaphragm Valve Structure and Principle
Diaphragm Isolation
A soft diaphragm made of rubber or fluoroplastics (such as PTFE, FEP) completely isolates the internal cavity of the valve body from the driving components (such as the valve stem and valve disc). The driving components move the valve stem via compressed air, electricity, or manual operation, causing the diaphragm to rise, fall, or compress, thus opening and closing the flow path and preventing contact between the medium and metal components.
Fluorine Lining Protection
The inner wall and flow path of the valve body are lined with fluoroplastics (such as PTFE, PFA), forming a corrosion-resistant barrier. The fluoroplastic lining layer has a uniform thickness (2-5mm) and is tightly bonded to the substrate, resisting the erosion of strong corrosive media such as hydrochloric acid, sulfuric acid, and nitric acid.
Advantages of PTFE Lined Diaphragm Valve
Strong Corrosion Resistance
Fluoroplastics (such as PTFE) have a wide temperature range (-50℃ to 260℃), resisting almost all strong acids, strong alkalis, organic solvents, and oxidizing media, replacing rare metal valves and reducing procurement costs.
Zero-Leakage Seal
The diaphragm's elastic seal ensures no internal leakage upon closure, while simultaneously isolating the drive components from the medium, preventing external leakage risks. It complies with ISO 9001 quality system requirements and industry explosion-proof certification.
Dead-Angle Flow Channel
The smooth inner wall of the flow channel minimizes media flow resistance, reducing the likelihood of crystallization or particle residue. This facilitates online CIP cleaning and makes it suitable for corrosive slurries containing small amounts of solid particles.
Compact Structure and Easy Maintenance
The stuffing box-less design allows for diaphragm replacement without disassembling the piping; only the valve cover needs to be removed, ensuring safe and convenient operation.
Key Technical Parameters of PTFE Lined Diaphragm Valve
Parameter Range/Options
Nominal Pressure: 0.1-1.6MPa (PTFE lining pressure limit)
Operating Temperature: -50℃ to 260℃ (depending on PTFE lining and diaphragm material; e.g., PTFE lining + PTFE diaphragm: -40℃ to 260℃)
Sealing Class: ≤VI (zero leakage)
Flow Capacity: Cv value 0.1-50 (depending on bore)
Actuation Method: Manual (handwheel/handle), Pneumatic (single-acting/double-acting), Electric (servo motor)
Connection Method: Flange (DN15-DN200), Threaded (DN10-DN50)
Applicable Media: Concentrated hydrochloric acid, nitric acid, sulfuric acid, organic solvents, highly corrosive waste liquids, etc. (hard particles are strictly prohibited)
PTFE Lined Diaphragm Valve Application Scenarios
Chemical Industry
Concentrated Hydrochloric Acid Delivery Pipeline: Carbon steel base + PTFE lining pneumatically operated imported PTFE-lined diaphragm valve, resistant to strong corrosion, preventing hydrochloric acid from corroding the valve body.
Pesticide Intermediate Solvent Delivery: Stainless steel base + FEP lining electrically operated imported PTFE-lined diaphragm valve, suitable for high purity requirements.
Metallurgical Industry
Acid Pickling Waste Discharge System: Cast iron base + FEP lining manually operated imported PTFE-lined diaphragm valve, resistant to the highly corrosive environment of acid pickling workshops.
Pharmaceutical Industry
Corrosive Drug Preparation Pipeline: Carbon steel base + PTFE lining electrically operated imported PTFE-lined diaphragm valve, compliant with GMP standards, preventing drug contamination.
Environmental Protection Industry
Highly Corrosive Wastewater Treatment System: Carbon steel base + FEP lining flanged imported PTFE-lined diaphragm valve, suitable for environmental protection treatment processes.
Electronics and Semiconductor Industry
Wafer Etching Solution Delivery Pipeline: 316L base + FEP lining reinforced PTFE diaphragm valve, high purity and particle-free, ensuring process precision.
PTFE lined diaphragm valve factory
GNEE Group has been a professional manufacturer of PTFE lined diaphragm valves for 18 years and offers customization services. Send us your drawings to customize one for you.