Marine butterfly valves must match the medium, corrosion risk, pressure class, connection standard and operating method of the vessel system. A correct selection starts with the line service—not only the nominal diameter.
1. Start with the service condition
For seawater and ballast service, corrosion resistance and seat compatibility are central. Record the medium, chlorides or solids, design pressure, operating temperature, pipe schedule and required shut-off level. For fire, bilge or general service, confirm applicable shipyard and class requirements before finalizing the design.
2. Select the valve construction
| Option | Typical reason to choose it |
|---|---|
| Wafer butterfly valve | Compact, economical installation between flanges. |
| Lug butterfly valve | Threaded lugs allow easier line-end servicing when the system design permits. |
| Flanged butterfly valve | Robust connection for larger sizes or specified marine piping standards. |
| Manual, pneumatic or electric actuation | Select according to operating frequency, remote-control need, torque and fail-safe requirement. |
3. Match body, disc and seat materials
Ductile iron, cast steel, stainless steel and aluminium bronze are common choices depending on the service. EPDM is widely used for compatible water services; NBR and other elastomers may suit different media. The final material schedule should be confirmed against the actual medium and project specification.
4. Documents to prepare for a quotation
Send the valve size, pressure rating, flange standard, medium, temperature, material preference, actuator requirement, quantity and certificate requirement. Drawings and line lists help our team confirm face-to-face dimensions, torque and accessory selection.
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