Butterfly valves, ball valves, gate valves, and check valves are most commonly used. Butterfly valves (316 stainless steel or aluminium bronze) are preferred for large pipelines, while ball valves (duplex or super duplex stainless steel) are used for smaller bores.

316 stainless steel, duplex, and super duplex grades provide excellent resistance to seawater corrosion, pitting, and crevice corrosion, making them ideal for long-term reliability in harsh marine environments.

Yes, aluminium bronze butterfly and check valves are highly resistant to saltwater, erosion, and biofouling, making them a trusted choice in ballast systems.

Check valves prevent backflow of seawater into pumps and treatment units, protecting critical equipment from damage and ensuring one-way flow within the system.

Ball valves are preferred for smaller diameter ballast lines and areas where full bore, unrestricted flow is required — such as treatment skids or sampling points. Butterfly valves are more efficient in larger diameter pipelines.

In modern systems, yes. Electric, pneumatic, or hydraulic actuators are often fitted to butterfly and ball valves, enabling integration with ballast water management systems (BWMS) for remote monitoring and control.

Critical. Incorrect materials can lead to rapid corrosion and valve failure. Duplex stainless steel, super duplex, and aluminium bronze are the most reliable options for seawater service.

Yes, though less common today. Gate valves in 316 stainless steel or duplex are sometimes used where tight shut-off is required in large diameter pipelines. However, butterfly valves are more compact and cost-effective.

Some valves may use epoxy coatings, rubber linings, or PTFE seats to enhance resistance to seawater, but in most cases, high-performance alloys like duplex stainless steel or bronze are specified instead of coated carbon steel.

Valves are protected by duplex stainless steel strainers, which filter debris, sediment, and marine organisms before water passes through pumps or treatment systems.

The IMO Ballast Water Management Convention requires vessels to use compliant treatment systems. This indirectly impacts valve selection, as only robust, corrosion-resistant materials can withstand the demands of continuous seawater handling and treatment processes.

Routine inspection for corrosion, wear, and seal integrity is essential. Spare valve seats and seals should be kept on hand, particularly for butterfly valves. Actuated valves may also require regular testing to ensure proper operation.