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Weir Type PTFE Lined Diaphragm Valve. Corrosion Resistant Lining: PTFE, FEP, or PFA lining protects against strong acids like hydrochloric and nitric acid. Wide Size Range: Available in DN15 to DN350 (1/2" to 14") to fit various pipeline requirements. Multiple Material Options: Body options include WCB, CF8, CF3, CF8M, and CF3M for different corrosion needs. Bidirectional Flow Control: Roof type structure allows bidirectional flow for versatile industrial applications. Versatile Industrial Use: Ideal for chemical, petroleum, wastewater treatment, and abrasive slurry applications. Standardized Flange Connection: Complies with HG/T, GB, ASME, and JIS flange standards for easy installation.