Engineered for handling highly aggressive chemicals, strong acids, and abrasive slurries, our flanged lined diaphragm valve features a heavy-duty weir-type body combined with a premium PTFE/EPDM dual-diaphragm structure. The virgin fluoropolymer lining (PTFE/PFA/FEP) completely isolates the fluid from the metal body, preventing internal corrosion and ensuring zero contamination.
The weir-type design minimizes diaphragm stroke, drastically extending service life while offering bubble-tight shutoff even under variable pressures. Ideal for chemical processing, chlor-alkali, power plant FGD, and wastewater treatment applications.
EU Customs Tariff Advantage: Bestec holds an individual lower anti-dumping duty rate in the EU. European distributors and system integrators can legally reduce import customs clearance costs when sourcing our lined valves.
EN 12266-1, API 598 (100% Spark Test for lining integrity)
Key Engineering Features
100% Spark-Tested Fluoropolymer Lining: Seamless molded PTFE/PFA lining with uniform thickness, rigorously high-voltage spark tested (15kV+) to guarantee zero pinholes and total corrosion immunity.
Two-Piece Composite Diaphragm: Heavy-duty PTFE diaphragm backed by a high-flex EPDM cushion ensures maximum chemical resistance, high thermal stability, and prolonged fatigue life.
Isolated Working Mechanism: The bonnet and stem mechanism are completely sealed off from the line media, protecting mechanical parts from corrosive vapors and preventing stem leakage.
Bi-Directional Bubble-Tight Shutoff: The weir-style seat contour distributes clamping pressure evenly across the diaphragm, achieving leak-free bi-directional sealing even in slurries containing suspended solids.
Primary Heavy-Duty Applications
Chemical & Petrochemical Processing: Safely controlling concentrated acids (H2SO4, HCl, HNO3), alkalis, organic solvents, and toxic fluids.
Chlor-Alkali & Fertilizers: Ideal for brine handling, chlorine gas systems, and phosphoric acid transportation lines.
Power Plant FGD & Water Treatment: Handling abrasive gypsum slurries, demineralized water, and acidic ion-exchange backwash.
Mining & Steel Industry: Managing acid pickling lines, tailings neutralization, and aggressive chemical dosing systems.
