Water valves that are 2-1/2 inches and larger may have bodies made of what material?

Water valves that are 2-1/2 inches and larger may be constructed from cast iron due to several important factors. Cast iron provides significant durability and strength, making it suitable for handling larger volumes of water and higher pressures often associated with commercial or industrial plumbing applications.

Cast iron's resistance to corrosion, especially when properly coated or treated, also makes it a preferred choice for long-term use in plumbing systems that may be exposed to various water conditions. The material's ability to withstand mechanical stress and its relatively low cost in comparison to some of the other materials like brass or stainless steel further solidifies its position as a go-to choice for larger valve bodies.

In contrast, while plastic may be lightweight and resistant to corrosion, it is not ideal for larger sizes due to structural limitations. Brass, although highly resistant to corrosion and suitable for smaller fittings and valves, does not generally offer the same mechanical strength required for larger valves. Stainless steel, while offering excellent corrosion resistance and strength, tends to be more expensive and is typically utilized in specific applications rather than as a standard material for larger valves. Thus, cast iron is the most appropriate and commonly accepted material for these larger water valve bodies.