We compare ductile iron and grey cast iron valves in terms of durability, ease of installation and prices.
Durability
Grey Cast Iron is a strong material that can handle higher pressures than just about any plastic. However, when rated pressure of a cast iron valve or pipe is exceeded, it can bend and crack. Grey Cast iron has virtually zero ductility, meaning it is rigid and will crack if bent. Grey Cast iron will also rust over time, so regular maintenance must be done to keep your valve clear of corrosion.
Ductile Iron: Ductile iron also has impressive structural integrity. It can handle high pressures and temperatures without flinching. Thanks to its ductile nature, this material is also less likely to crack when bent. Ductile iron will also rust over time, but not as easily as grey cast iron.
Ease of Installation
Grey Cast Iron gives the user many options when it comes to installation. Cast iron valves are typically bolted using flanges. Welding is difficult, but not impossible. Our cast iron valves are available with flanged ends, as this is a great method for high or low pressure applications.
Ductile Iron: Ductile iron, because of its structural similarities to cast iron, gives the user many of the same installation options. Welding is not recommended, but bolting with the use of flanges is still the best option for most applications.
Price
Grey Cast Iron valves, due to their simpler manufacturing process, will save you a significant amount money compared to ductile iron valves. If you do not need the added benefits that ductile iron provides, grey cast iron is the smart move.
Ductile Iron: Ductile iron is the more expensive option, but for good reason. It has properties that give it clear advantages over cast iron in many situations. 
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