The valve stem is a vulnerable part, and the mechanical performance and heat treatment performance of the material should be paid attention to when selecting,The valve stem is an important part of the valve. The stem bear pulled in the valve opening and closing process, and compression and torsion force, and direct contact with the media, It is used to drive, connect the actuating mechanism or handle, and directly drive the spool to move or rotate, so as to realize the function of valve switch or regulation.Valve stem in the valve opening and closing process is not only moving parts, stress components, but also seals. At the same time, it is subjected to the impact and corrosion of the medium, and it also causes friction with the packing. Therefore, in selecting the stem material, it must be guaranteed that it has sufficient strength at the prescribed temperature, good impact toughness, scratch resistance, corrosion resistance. …

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