Frequently Asked Questions About Marine Butterfly Valves
This FAQ page provides answers to the most common questions about marine butterfly valves, helping shipowners, shipyards and engineers make informed decisions.
1. What is a marine butterfly valve?
A marine butterfly valve is a type of quarter-turn valve used to regulate or isolate flow in shipboard piping systems. It is widely applied in seawater, ballast water, fuel oil, lubricating oil, and fire-fighting systems.
2. What are the types of marine butterfly valves?
Concentric (Centerline) Butterfly Valve: Suitable for low to medium pressure systems, compact and cost-effective.
Double Offset (Double Eccentric) Butterfly Valve: Designed for higher pressure and temperature, reduced friction and longer sealing life.
Triple Offset Butterfly Valve: Suitable for high-pressure, high-temperature, and critical isolation applications, providing metal-to-metal sealing.
3. What materials are used for marine butterfly valves?
Body: Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel
Disc: Stainless Steel, Aluminum Bronze (C95400)
Seat: NBR, EPDM, PTFE, Metal Seated
Stem: Stainless Steel, Duplex Stainless Steel
4. What standards do marine butterfly valves comply with?
API 609 / ISO 5752
EN 1092-1 / ANSI B16.5 / JIS
Pressure Ratings: PN10 / PN16 / Class 150, Class 300
Marine class approvals are available: ABS, DNV, CCS, LR, BV.
5. What are wafer type and lug type marine butterfly valves?
Wafer Type: Installed between flanges, compact and lightweight, ideal for limited space.
Lug Type: Can be installed at the end of a pipeline with bolts, suitable for dead-end service.
6. Can marine butterfly valves be customized?
Yes. Manufacturers can provide valves with customized materials, sizes, actuation methods (manual, gearbox, electric, pneumatic), and certifications to meet project requirements.
7. How to choose the right marine butterfly valve?
Determine the operating pressure, temperature, and medium.
Select valve type: concentric, double offset, or triple offset.
Choose materials suitable for marine corrosion resistance.
Ensure compliance with required standards and marine class approvals.
8. Why choose a Chinese marine valve manufacturer?
Chinese manufacturers offer:
Competitive pricing with reliable quality
Complete in-house manufacturing and quality control
International standard compliance and marine class approvals
Flexible customization and technical support
Stable export experience for shipyard projects
9. How to get a quote for marine butterfly valves?
Contact the manufacturer with details including:
Valve type and size
Material requirements
Pressure and temperature ratings
Actuation method
Certification needs (ABS, DNV, CCS, etc.)
Manufacturers will provide datasheets, drawings, and quotations promptly.
Post time: May-18-2026
