A ductile iron valve, also known as a nodular iron valve or a spheroidal graphite iron valve, is a type of valve that is made from a material called ductile iron. Ductile iron is a form of cast iron that has been treated with a small amount of magnesium or cerium to create graphite spheres within the iron matrix, giving it enhanced mechanical properties compared to traditional cast iron. This makes ductile iron valves highly resistant to deformation and cracking, even under high-pressure conditions.

Ductile iron valves are commonly used in various industries, including oil, gas, water treatment, and industrial applications.