PFA lined valve is a corrosion-resistant valve with high-performance fluoroplastic polyperfluoroethylene propylene (PFA) as the lining material. Its core is to achieve effective isolation and control of corrosive media by adding PFA lining to the inner wall and key contact parts. The following is a detailed analysis:
1. Structure and design features
Fully lined structure
The valve body, ball, valve seat and other parts in contact with the medium are thickened and paved with PFA material. The lining and the metal shell are tightly combined through high-pressure injection molding to ensure sealing and anti-permeability.
Material advantages
Corrosion resistance: It can withstand 98% of strong acids, strong alkalis and organic solvents (such as hydrofluoric acid and concentrated sulfuric acid), and has strong chemical inertness; High temperature resistance: Long-term working temperature -80℃~260℃, short-term tolerance 300℃; Surface characteristics: The friction coefficient is as low as 0.05, avoiding medium residue, and meeting the cleanliness standards of the semiconductor industry.
2. Application fields
Chemical and petroleum
Used for the control of the delivery of acid, alkali and salt solutions, as well as the regulation of high-temperature and high-pressure corrosive fluids.
Semiconductor manufacturing
Control high-purity chemical reagents in the cleaning process to avoid metal ion contamination and meet the SEMI F57 standard.
Medicine and environmental protection
Applicable to liquid medicine transmission and waste gas and wastewater treatment systems in sterile environments.
3. Typical types
Common structures include:
Fully lined PFA ball valve: Rapid opening and closing by rotating the ball, suitable for frequent operation scenarios;
PFA diaphragm valve: Flexible diaphragm isolates the drive component, used in high-purity and sterile environments;
PFA check valve: Prevents medium backflow and ensures one-way flow in the pipeline.
