3-Way Anti-Corrosion Ball Valve — WCB Body with PFA Lining, ANSI 150 Flange, L and T Port

The 3-way anti-corrosion ball valve with PFA lining combines two of the most demanding features of process engineering in a single component: the diversion and mixing functionality of the 3-way valve, and the total chemical resistance of PFA (Perfluoroalkoxy) lining for the industry's most aggressive fluids — hydrofluoric acid, concentrated sulfuric acid, chlorine dioxide, concentrated hydrochloric acid, and any fluid that would destroy stainless steel, PVC, or non-fluorinated polymers. With a single PFA-lined ball and a 90° turn, it diverts the flow of an aggressive acid between two alternative destinations (L-port) or mixes two corrosive streams into a single outlet (T-port) — without any metallic surface contacting the fluid in any operating position.

Available in diameters from 1" to 4" with ANSI 150 flanges and ISO 5211 mounting pad for automation with pneumatic or electric actuators.

Why a specifically anti-corrosion 3-way valve

In aggressive chemical installations, the diversion and mixing of corrosive fluids is a frequent operational necessity — selection between two acid sources, product diversion between two storage tanks, mixing of two reagents before the addition point, reagent recirculation during startup. The conventional alternative of two coordinated 2-way valves is possible, but has specific disadvantages in aggressive acid installations:

• More flanged connections: Every flanged connection in an HF or ClO₂ line is a potential leak point — the 3-way valve reduces the number of connections to three instead of four.
• Risk of period with both circuits open: If the control logic fails when switching between two 2-way valves, there may be a period where both circuits are simultaneously open — in aggressive acid lines, this can be a safety incident. The 3-way ball physically prevents this condition.
• More anti-corrosion components: Two PFA anti-corrosion 2-way valves cost more than one 3-way valve of the same diameter, and require two actuators instead of one for automation.

L-Port vs. T-Port — specify the correct one before ordering

L-Port — Acid Diversion between Two Destinations

The L-port ball always connects only two of the three ports — never all three simultaneously.

• 0° Position: Port A connected to Port B. Port C blocked.
• 90° Position: Port A connected to Port C. Port B blocked.

Applications in corrosive fluid lines:

• Acid diversion between two alternative storage tanks
• Selection between main acid source and backup source
• Bypass of filters or heat exchangers in aggressive acid lines
• Instantaneous switching between two destinations without a period of both circuits open

T-Port — Mixing Two Corrosive Streams

The T-port ball in the central position connects all three ports simultaneously. In extreme positions, it connects only two.

• 0° Position (central): Ports A, B and C connected — mixing two corrosive streams into a single outlet
• 90° Position: Port A with Port B only
• -90° Position: Port A with Port C only

Applications in corrosive fluid lines:

• Mixing two acids before the dosing point
• Reagent recirculation to the source tank during process startup
• Acid distribution to two addition points with simultaneous position at startup

Not sure which port you need? It's the most frequent specification error in 3-way valves — consult us before ordering.

PFA Lining — total coverage without exposed metal

As with the 2-way PFA anti-corrosion ball valve, the PFA lining covers absolutely all internal surfaces in contact with the fluid:

• ✅ Body: WCB + integral PFA lining
• ✅ Cover: WCB + PFA lining
• ✅ Gland packing: WCB + PFA lining
• ✅ Ball / Stem: WCB + PFA lining
• ✅ Seat: Virgin PTFE
• ✅ Packing: PTFE

No metallic surface is exposed to the fluid in any open or closed position — neither at 0° nor at 90°. The fusion-applied PFA creates a continuous barrier without joints or porosity that prevents any contact between the aggressive fluid and the structural WCB metal.

Technical specifications

• Type: Quarter-turn floating ball, 3-way
• Body design: Two-piece body
• Ball configuration: L-port (diversion/selection) or T-port (mixing/distribution) — specify when ordering
• Body material: A216 WCB + integral PFA lining
• Ball / Stem: A216 WCB + PFA lining
• Cover: A216 WCB + PFA lining
• Gland packing: A216 WCB + PFA lining
• Seat: Virgin PTFE
• Packing: PTFE
• Connection: ANSI 150 RF flanges — face-to-face ASME B16.10
• Flange drilling: ASME B16.5
• Nominal diameters: 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 travel: 90° between extreme positions
• Actuator mounting: ISO 5211
• Recommended flange gasket: Virgin PTFE — never a fiber gasket that could be attacked by the aggressive fluid

Compatible fluids

Automation in environments with aggressive acid vapors

In installations with HF, concentrated HCl, H₂SO₄, and other strong acids, fluid vapors can corrode actuator components. The single-acting NC pneumatic actuator is the standard safety configuration:

• NC pneumatic actuator with acid vapor resistant housing: Specify SS316 housing or high chemical resistance epoxy coating. Standard anodized aluminum would corrode within weeks in the presence of HCl or HF vapors.
• Mandatory NC fail-safe for hazardous fluids: The mechanical spring ensures the valve closes in the event of any air supply or control signal failure — interrupting the aggressive acid flow without relying on electronic components. Define which of the two circuits (position A or position B) is the safe state in case of failure before ordering the actuator.
• ATEX classified zones: In plants where acid vapors can create hazardous atmospheres, specify ATEX solenoid. The pneumatic actuator itself does not require ATEX certification — only the solenoid.
• Do not use in intermediate position: The 3-way valve operates between its two extreme positions (0° and 90°) only — operating in an intermediate position causes accelerated seat wear.

• See ball valve sets with pneumatic actuator →
• See ball valve sets with electric actuator →

Main industries and applications

• Chemical industry — concentrated acid diversion: Selection between two H₂SO₄, HCl or HNO₃ storage tanks, diversion between two acid product destinations, bypass of equipment in inorganic acid lines. The PFA 3-way anti-corrosion valve is the only viable diversion component for these fluids in diameters from 1" to 4".
• Petrochemical — HF alkylation: Diversion of hydrofluoric acid flows in refinery alkylation units — selection between alternative process routes, bypass of acid regeneration equipment. PFA lining is the only viable material for diverting pressurized liquid HF.
• Pulp and paper — ClO₂ distribution: Diversion of chlorine dioxide between bleaching stages, selection between alternative dosing lines. SS316 fails due to pitting within weeks under these conditions — the PFA 3-way ball is the reliable solution.
• Mining — SX-EW electrolyte distribution: Diversion of concentrated H₂SO₄ electrolyte between electrodeposition cells, selection between distribution circuits in copper electrolysis plants.
• Water treatment — disinfection reagent distribution: Diversion of concentrated ClO₂ between alternative injection points, selection between dosing units in water treatment plants using chlorine dioxide as the primary disinfectant.
• Semiconductors — acid mixture distribution: Diversion of HF, HNO₃, and etching acid mixtures between alternative process chambers in integrated circuit and flat panel display manufacturing.

Compatibility verification

Correct selection requires knowing the exact concentration, temperature, and complete composition of the fluid. Share this data via WhatsApp or to ventas@cematic.com — we will verify PFA compatibility for your specific process at no cost on the same business day.

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

Technical Data Sheet