Because the metal hard seal ball valve sealing surface adopt superhard material or surface hardening treatment ( ≥45 HRC /≥950高压) , use common tool will not be able to process, even to the machining precision can't meet the requirements, so it is very important to choose the appropriate tool processing. The precision lapping generally adopts special grinding machine, its structure is mainly composed of the clamping sphere of rotating shaft and the grinding head. The composition of grinding head main centering flange are connected by a shaft ( Connection plate) Article, spring floating mechanism, grinding of the clamping plate and grinding bar. Grinding according to the sphere surface treatment, can choose all kinds of oil sand or synthetic diamond materials. Metal hard seal ball valve seat, substrate material should be used in linear expansion several close to the shell material of stainless steel materials, sealing surface hardening treatment technology still can use manual welding or plasma spray welding carbide. Final thickness of surfacing welding layer usually, metal hard seal ball Industrial Valves seat sealing surface, in a special grinding ball machine using planetary grinding principle and sphere at the same time for precision grinding, and then with a sphere one-to-one manual running-in, tested by the indentation method.
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