What are the specific requirements for surface hardening (HF) of ball valves in engineering design?
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The description of surface hardening of the valve internals in SH is as above, which is fairly clear; topics related to flashing and cavitation processes will be addressed by specialists in these fields. How can professional designers of instrument panels for seats determine severe erosion on their own? The description regarding surface hardening of ball valves is rather vague. Surface hardening treatment is carried out as needed; it’s not clear what exactly is required or how it is done, nor are there any details on the different methods of hardening used for the valve seat and the ball I hope some expert can explain it.
Ball valves can be surfaced by welding, plasma cladding, or spraying with STL; the surface hardness can reach over 40HRC. They are suitable for applications involving high wear, high corrosion, or media containing particles. Another option is to use hard-sealed ceramic ball valves, but these are relatively brittle and cannot withstand impacts or the presence of metal contaminants in the material.
HF can merely be regarded as a code for surface hardening; the type of hardened layer can be chosen based on the operating conditions of the valve, and it also depends on which hardening process is suitable for the base material of the valve components. For example, methods such as plasma surfacing, supersonic spraying, and laser cladding – in short, different processes lead to different final results. It is possible that some valves only need to be corrosion-resistant and wear-resistant, while those with more stringent requirements may also require specific manufacturing processes. Handle each situation on its own