The butterfly valve material you choose depends on the body, disc, seat, and liner. Common options include carbon steel, stainless steel, duplex steel, nickel alloys, titanium, and nickel aluminium bronze. Each material supports different pressures, temperatures, and corrosion conditions.
Overview of Butterfly Valve Materials
Butterfly valves use different materials for the body, disc, seat, and liner because each part faces its own pressure, temperature, and media demands. The table below gives a quick butterfly valve disc material selection guide before you compare each option in detail.
| Component | Typical Materials | Why It’s Used |
| Body | Carbon steel, stainless steel, ductile iron | Strength, pressure capability, cost balance |
| Disc | Stainless steel, duplex, nickel alloy, titanium | Direct media contact, corrosion resistance, torque stability |
| Seat | EPDM, NBR, PTFE, metal seat | Sealing performance, temperature range, chemical compatibility |
| Liner | Rubber (EPDM/NBR), PTFE | Body protection, corrosion resistance, media isolation |
1. Carbon Steel
Carbon steel is one of the most common butterfly valve body materials. It works well when cost control matters more than corrosion resistance. WCB and LCC are the two grades used in many plants.
A WCB butterfly valve body handles higher temperatures. An LCC body works at lower temperatures. Both are usually sand-cast because carbon steel flows well in cast molds.
The main advantage is simple. It is affordable. You get strong mechanical properties at a low cost. The disadvantage is corrosion, which can limit the valve in acidic or chloride-rich media.
2. Stainless Steel
Stainless steel solves the corrosion problem. It forms a protective oxide layer that can handle many media types. It also has good toughness at high and low temperatures.
Austenitic grades are the most used in butterfly valve material selection. They stay tough in cryogenic service and handle water, chemicals, and many industrial fluids. Duplex stainless steel offers higher strength with solid corrosion resistance. That can help when flow velocities are high or when pitting corrosion is likely.
3. Duplex Stainless Steel
Duplex stainless steel balances strength and toughness. It also carries better resistance against pitting and crevice corrosion than standard austenitic grades. This helps when chloride levels are high.
The main advantage is strength plus corrosion resistance. The main disadvantage is cost. It is higher than standard stainless steel, but far lower than nickel alloys or titanium.
4. Nickel Alloys
Nickel alloys enter the picture when service conditions become severe. Hastelloy and other nickel-based alloys resist aggressive media that break down the oxide layer on stainless steel.
That can include oxidizing acids, reducing acids, or mixed chemical streams. Nickel alloys are often selected as the butterfly valve disc material when the disc faces constant chemical exposure. The downside is that they cost several times more than stainless steel
5. Titanium Alloys
Titanium is chosen when corrosion resistance must be extremely high. It works especially well in seawater, offshore desalination plants, chlorine systems, and hypochlorite-treated water.
Titanium also has the best strength-to-weight ratio. That can reduce installation load when pipeline structures cannot support heavy valves.
6. Nickel Aluminium Bronze
Nickel aluminium bronze is another strong option in seawater systems. It resists biofilm formation better than stainless steel. It also handles brine, seawater, and many industrial water streams.
The cost sits close to basic stainless steel grades. The challenge is galvanic corrosion. If you connect a nickel aluminium bronze butterfly valve to stainless steel piping, the valve can corrode quickly in seawater. Engineers fix this with insulation kits and proper flange isolation.
Butterfly Valve Disc Material Selection Guide
The disc sees direct fluid contact. So the butterfly valve disc material selection guide focuses on corrosion, flow velocity, and erosion.
- Carbon steel discs work in general service
- Stainless steel discs handle water, steam, chemicals, and mild corrosives
- Duplex discs resist pitting in chloride service
- Nickel alloy discs handle aggressive chemical media
- Titanium discs handle seawater and chlorine
Disc material also affects torque. Stronger materials reduce deformation and help the disc seal consistently over long cycles.
Butterfly Valve Seat Material Options
The seat controls sealing performance. The butterfly valve seat material changes depending on media type, temperature, and shutoff requirements.
- EPDM works in water and many clean fluids.
- NBR handles oils and hydrocarbon service
- PTFE works in many chemicals and has a wide temperature range
- Metal seats handle high-temperature and abrasive applications
The seat choice defines whether the valve achieves bubble-tight shutoff or only a controlled leakage rate.
What Material Is Used for Butterfly Valve Liners?
The liner shields the body. EPDM, NBR, PTFE, and chlorobutyl rubber are common. The liner must match the chemical properties of the media. It also needs to handle temperature swings without hardening or cracking.
Choosing the Right Butterfly Valve Material
Your choice depends on pressure, temperature, corrosion risk, and pipeline compatibility. It also means matching the disc, body, and liner so they age at the same rate. If you mix unmatched materials, you can create galvanic corrosion or premature seat wear.At CTGV, we supply butterfly valves in carbon steel, stainless steel, duplex, nickel alloys, titanium, and nickel aluminium bronze. Our engineering team can recommend the right butterfly valve material based on your service conditions.
