Discussion on valve internal component materials
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Regarding valve materials: Could you please explain the differences in the materials used for the internal components of the following valves? It mainly involves comparisons of hardness and corrosion resistance, as well as application areas. Thank you all. 【1】A216-WCB 【2】17-4PH 【3】XM-19 【4】316+NI55/60 【5】316+STL 【6】317 【7】Hastelloy 【8】20# alloy 【9】Monel alloy 【10】Duplex stainless steel
The most critical components of a valve are the contact parts between the valve port and the valve stem. They are all made of rigid materials, so sealing is an issue. Therefore, when making a choice, there are relevant usage instructions available; it is best to select the one that is most suitable. For reference.
You can refer to this table showing the suitable materials for the electrodes and lining of electromagnetic flowmeters; something similar:
It’s useless to tell you; when designing valve internals, these factors alone aren’t taken into account – there are many other elements as well.