Valve parts must be treated with the following procedures before assembly:
1, according to the processing requirements, some parts need to do polishing treatment, the surface can not have processing burrs and so on;
2, all parts for skimming treatment;
3, after the completion of pickling passivation, cleaning agent does not contain phosphorus;
4, pickling and purification with pure water rinse clean, can not have pharmaceutical residues, carbon steel components to save this step;
5, one-by-one parts with non-woven fabric drying, can not be wired wool and other retained parts of the surface, or with clean nitrogen to blow dry;
6, with non-woven fabric or precision filter paper dipped in the analysis of pure alcohol to each component to wipe, until there is no dirty color.