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What are the advantages of ductile iron butterfly valves?

May 23,2018 Posted by Bundor

Industry News

What are the advantages of ductile iron butterfly valves? The ductile iron butterfly valve is a butterfly valve made of ductile iron. Relying on the outstanding characteristics of ductile iron materials, the butterfly valve adapts to more conditions and uses a wider range of applications. What are the advantages of butterfly valves made of ductile iron?

This requires us to start from the material of ductile iron. Ductile iron was developed in 1949 as a substitute for steel.

The carbon content of spheroidal graphite cast iron exceeds 3%, which is far higher than the carbon content of cast steel. The carbon in cast iron is in the form of natural free graphite flakes. In ductile cast iron, the graphite flakes are treated as tiny spheres by special treatment. Specially treated spheres make ductile cast iron more comparable to cast iron and steel materials. Better physical properties, improved ductility and impact resistance.

The advantages of ductile iron butterfly valves are:

Compared with cast iron materials, ductile iron materials have advantages in strength and hardness. The tensile strength of ductile iron is 60k, while that of cast iron is only about 30k. The yield strength of ductile iron is 40k, but the yield strength of cast iron is not shown, and finally the fracture phenomenon occurs. Therefore, the butterfly valve made of ball-milled cast iron has better tensile strength than cast iron.

Compared with cast steel materials, the tensile strength and yield strength of ductile cast iron are not inferior to those of cast steel.In some working conditions, such as: water, salt water, steam and other piping systems, ductile iron is resistant to corrosion and oxidation and even more than cast steel.In addition, the most important point is that the cost of ductile iron is lower than that of cast steel. Therefore, ductile cast iron butterfly valves are more popular among users unless they have special working conditions (cast steel has a wider temperature resistance than ductile iron).

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