The present invention discloses a hard sealed change valve manufacturing process. The valve body and valve core parts are surface treated via anode oxidation technological process to form hard wear resistant layer. The valve body and the valve core with hard wear resistant layer are further machined into precise moving and coupling pair. The hard sealed valve thus produced has excellent self-lubricating performance, low friction coefficient, high wear resistance, long service life, small volume and high chemical corrosion rsistance, and is suitable for various fields and mediums. |