Fluorine-Lined Valves

Fluorine lined valves isolate corrosive process fluid from the metal body through a thick (2-5mm) fluoropolymer liner covering every wetted surface inside the valve cavity. The metal outer body (ductile iron, carbon steel, or stainless) provides structural strength and pressure containment — the fluoropolymer liner provides chemical resistance. This dual-wall construction separates the two functions that standard metal valves combine in one material: pressure containment and corrosion resistance. No metal surface touches the process fluid. Zero corrosion attack on the body, zero contamination of process media by metal ions, zero galvanic concerns. FLOWKS manufactures five fluorine lined valve configurations using three liner materials. PTFE (polytetrafluoroethylene) lined ball valves use a 3-5mm full-body PTFE sleeve covering all internal surfaces — PTFE is chemically inert to virtually everything except molten alkali metals and elemental fluorine at high temperature, making it the last-line corrosion barrier when stainless, Hastelloy, and titanium all fail. PFA (perfluoroalkoxy) lined globe valves use PFA's superior melt-processability and 10x lower cold-flow creep than PTFE — the smoother molded surface and higher dimensional stability survive thousands of disc-seat throttling cycles where PTFE would thin and leak. PTFE lined butterfly valves bring corrosion isolation to large diameters (2"-24") at Class 150 where lined ball valves would cost 2-3x more. FEP (fluorinated ethylene propylene) lined check valves use FEP's smoother melt-molded surface for better disc hinge dynamics and lower friction — same chemical resistance as PTFE, better mechanical behavior for the swing/lift check function. Vertical ball type fluorine lined check valves use a free-floating ball as the only moving part — no hinge, no spring, no guide mechanism, one-ball gravity closure with the fewest failure modes in corrosive check service.

FLOWKS fluorine lined valves provide zero-metal-contact corrosion isolation for concentrated acids, chlorine, caustics, solvents, and all process media that attack stainless steel, Hastelloy, and titanium. Thick PTFE, PFA, and FEP liners (2-5mm) cover every wetted surface inside the valve body — the metal outer shell holds pressure while the fluoropolymer liner blocks chemical attack. PTFE lined ball valves deliver full-body corrosion isolation at 1/2"-12" Class 150-300 for chemical processing and pharmaceutical manufacturing where the process attacks every available metal. PFA lined globe valves use PFA's 10x lower cold-flow creep and smoother melt-molded surface for throttling service — the liner survives thousands of disc-seat cycles where PTFE would thin and leak. PTFE lined butterfly valves bring fluoropolymer isolation to large diameters (2"-24") at Class 150 at significantly lower cost than lined ball valves. FEP lined check valves apply FEP's smoother surface finish for better disc swing/lift dynamics — same chemical resistance, lower friction, more reliable opening and closing. Vertical ball type fluorine lined check valves use a single free-floating ball as the only moving part — gravity closure, zero mechanical complexity, the fewest failure modes for corrosive vertical check service.