Cast iron valves have a specific range of applications in ship systems due to their economy, corrosion resistance and good casting performance.

Applicable system scope

• Seawater cooling system (low temperature and low pressure part)
• Ballast water system (ordinary cargo ship)
• Bilge drainage system
• Living water system (fresh water)
• Ventilation system (non-critical area)

Typical application valve types

Valve type	Application	Mark
gate valve	Bilge water main	DN50-DN200
butterfly valve	Ventilation line	Normally open
swing check valve	Pump outlet	swing type
Y strainer	Seawater inlet	Removable for cleaning

Special requirements for marine cast iron valves

Material standard

1. Body material

2. Liner required

Typical ship project cases

Bulk carrier ballast system:

DN150 cast iron butterfly valve (epoxy coating)

Cruise ship domestic water system:

QT400 ductile iron gate valve