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What are the classifications of valves based on their nominal diameter?
Based on the nominal diameter of the valves, they can be classified as follows: - **Small-diameter valves**: Valves with a nominal diameter of DN <40 mm are suitable for small piping systems or applications that require precise flow control. - **Medium-diameter valves**: Valves with a nominal diameter of DN 50–300 mm are commonly used in industrial piping systems and for general flow control applications. - **Large-diameter valves**: Valves with a nominal diameter of DN 350–1,200 mm are designed for large piping systems or applications involving high flow rates. - **Extra-large-diameter valves**: Valves with a nominal diameter of DN ≥ 1,400 mm are suitable for ultra-large piping systems or special engineering applications.
The nominal diameter (DN) is an internationally recognized standard for measuring pipe sizes. It is represented by the format “DN + number”; for example, DN100 indicates a piping system with a nominal diameter of 100 mm. Although piping components made of different materials may have different outer diameters, they can be interconnected as long as their nominal diameters are the same.
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