Corrosion-Resistant Ball Valve — WCB Body with Integral PFA Lining, ANSI 150 Flange

The PFA-lined corrosion-resistant ball valve is the isolation solution for the most aggressive fluids in the chemical industry: hydrofluoric acid, concentrated hydrochloric acid, high-concentration sulfuric acid, chlorine dioxide, concentrated hydrogen peroxide, and any fluid that would destroy stainless steel, PVC, or non-fluorinated polymers in days or weeks. The PFA (Perfluoroalkoxy) lining continuously and seamlessly covers absolutely all internal surfaces in contact with the fluid: body, cover, gland box, and ball with stem — all metal components are PFA-lined, leaving no metal surface exposed to the corrosive fluid.

The WCB carbon steel structure provides the mechanical strength to withstand ANSI 150 pressures (up to 290 psi / 20 bar), while the PFA acts as an impermeable chemical barrier between the metal and the fluid. Available in sizes from 1" to 4" with ANSI 150 flanges and ISO 5211 mounting pad for automation.

PFA — the strongest chemical barrier available in standard valves

PFA (Perfluoroalkoxy) is the fluoropolymer with the highest chemical resistance available for industrial valve linings. Its advantage over conventional PTFE is not in intrinsic chemical resistance — both are fluoropolymers with virtually universal resistance — but in how it is applied:

• Injection molded lining — no joints or porosities: PFA is applied in a molten state and molded directly onto the metal substrate, creating a continuous, perfectly adhered layer with no joint lines, seams, or porosities. The result is a completely impermeable barrier — the aggressive fluid cannot penetrate to the underlying metal even with prolonged service.
• Integral coverage of all components: Unlike valves where only the body has a PTFE liner but the ball is exposed SS316, in this valve all fluid-contacting components are PFA-lined: body (component 9), cover (component 12), gland box (component 7), and ball/stem (component 11). There is no point where the fluid can reach the metal — in any open or closed position.
• Semi-transparent — visual inspection possible: PFA is semi-transparent, which in many cases allows for visual inspection of the lining condition without disassembly — detecting blistering or delamination before it causes a leak.

Valve components — complete material table

Conclusion: The four fluid-contacting components (body, cover, gland box, and ball/stem) are PFA-lined. The seat is virgin PTFE. No metal surface is exposed to the fluid under any operating condition.

When is the PFA corrosion-resistant ball valve the only correct option?

Some fluids destroy all other valve alternatives on the market except PFA and PTFE. This valve is mandatory (not optional) when the fluid is:

• Hydrofluoric acid (HF) — any concentration: HF is the most corrosive fluid in the chemical industry for metals and glass. SS316 would corrode in hours. PFA is one of the only materials resistant to HF at all concentrations. Applications: HF alkylation units in refineries, fluoride production, surface treatment.
• Chlorine dioxide (ClO₂): The most aggressive oxidant in the paper industry. SS316 suffers severe pitting within weeks at bleaching concentrations. Continuous, seamless PFA lining is the correct solution.
• Sulfuric acid H₂SO₄ >50%: Concentrated H₂SO₄ attacks SS316 and PVC. PFA is compatible at any concentration up to boiling point.
• Hydrochloric acid HCl >35%: At high concentrations and elevated temperatures, HCl attacks even SS316. PFA resists at all concentrations.
• Hydrogen peroxide H₂O₂ >30%: Strong oxidant that degrades conventional elastomers and attacks SS316 at high concentrations.
• Aqua regia (HNO₃ + HCl) and acid mixtures: The most aggressive mixtures in industrial chemistry — PFA is practically the only lining material that resists these combinations.
• SX-EW cell electrolyte (H₂SO₄ + metal ions): Copper electrowinning electrolyte in mining contains 150–200 g/L H₂SO₄ plus aggressive ions — incompatible with SS316.

Technical Specifications

• Type: Quarter-turn floating ball
• Body Design: Two-piece body
• Body Material: A216 WCB + integral PFA lining
• Ball / Stem: A216 WCB + PFA lining
• Cover: A216 WCB + PFA lining
• Gland Box: A216 WCB + PFA lining
• Seat: Virgin PTFE
• Packing: PTFE
• Body Bolts: A193 B7
• Connection: ANSI 150 RF Flanges — ASME B16.10 Face-to-face
• Flange Drilling: ASME B16.5
• Nominal Sizes: 1" (DN25), 1½" (DN40), 2" (DN50), 3" (DN80), 4" (DN100)
• Nominal Pressure: ANSI 150 — up to 290 psi (20 bar) at 38 °C
• Operating Temperature: -20 °C to +200 °C
• Actuator Mounting: ISO 5211
• Recommended Flange Gasket: Virgin PTFE or spiral wound with PTFE spiral — never a fiber gasket that could be attacked by the aggressive fluid

Chemical compatibility — most common fluids

Automation in environments with aggressive acid vapors

In installations with HF, concentrated HCl, H₂SO₄, and other strong acids, fluid vapors can reach the actuator and corrode its components — especially the anodized aluminum body of standard actuators. Specific considerations for these environments:

• Pneumatic actuator with stainless steel housing or epoxy coating: For environments with acid vapors, specify an actuator with SS316 housing or with high chemical resistance epoxy coating instead of standard anodized aluminum. Aluminum would corrode within weeks in the presence of HCl or HF vapors.
• Single-acting Normally Closed (NC): For highly hazardous fluids (HF, ClO₂, concentrated H₂SO₄), automatic shut-off in case of any control system failure is the standard safety requirement — the mechanical spring ensures closure without reliance on electronic components.
• ATEX classified areas: In plants where acidic fluid vapors can create hazardous atmospheres, specify an ATEX solenoid. The pneumatic actuator itself does not require ATEX certification — only the control solenoid.

• View ball valve assemblies with pneumatic actuator →
• View ball valve assemblies with electric actuator →

Main industries and applications

• Chemical industry — concentrated acids: Production and distribution of HF, H₂SO₄, HCl, HNO₃ and their mixtures in inorganic acid plants. The PFA ball valve is the standard isolation component in concentrated acid lines where SS316 and PVC fail.
• Petrochemical — HF alkylation: Refinery alkylation units that use HF as a catalyst have hydrofluoric acid lines that require PFA-lined valves at all isolation points. There is no viable alternative for liquid HF service under pressure.
• Pulp and paper — ClO₂ bleaching: ECF bleaching stages with chlorine dioxide require PFA ball valves. SS316 fails due to pitting within weeks, and the corrosion-resistant butterfly valve with molded PTFE liner may have vulnerable penetration lines — the PFA ball valve with continuous lining is the reliable long-term solution.
• Mining — SX-EW electrolyte: The copper electrowinning circuit uses 150–200 g/L H₂SO₄ as electrolyte. PFA ball valves are the standard for electrolyte lines in electrolysis cells in Sonora, Chihuahua, and San Luis Potosí.
• Water treatment — ClO₂ disinfection: Modern water treatment plants that use chlorine dioxide as a disinfectant require PFA corrosion-resistant valves in the generation and distribution lines of pure ClO₂ before dilution.
• Semiconductors and microelectronics: Acid etching processes with HF, HNO₃, and acid mixtures. PFA ball valves are the industry standard due to their purity (no metallic extractables that contaminate substrates) and resistance to process acids.
• Pharmaceutical — synthesis with strong acids: The synthesis of some active pharmaceutical ingredients (APIs) involves strong acids in reaction or purification stages. The PFA ball valve covers these services by combining acid resistance with material purity.

Compatibility verification — how Cematic advises

Correct selection for a specific fluid requires knowing three simultaneous parameters: exact concentration, operating temperature, and presence of other components in solution. At Cematic, we verify the compatibility of the PFA lining for your specific fluid before quoting — and identify whether PFA is necessary or if a lower-cost alternative is sufficient for your specific process conditions. Share the fluid, concentration, and temperature via WhatsApp or to ventas@cematic.com and receive verification free of charge on the same business day.

For the complete range of corrosion-resistant valves, see PFA corrosion-resistant ball valve category →

Technical Data Sheet