The first valve just inside the hull of a ship is called?

• A. Suction valve
• B. Discharge valve
• C. Skin valve
• D. Ball valve

Answer: (C)

Skin valve. In ship terminology, a skin valve is the valve installed on the hull skin where piping passes through the vessel’s shell. It sits just inside the hull and is used to control seawater lines, such as intake or discharge lines, and can be shut to prevent water from flowing in or out in case of damage or maintenance. The other options describe location or valve type but not the hull-crossing position: a suction valve is on a pump’s suction side, a discharge valve on the discharge side, and a ball valve refers to the valve mechanism rather than where it sits.