Metal seat butterfly valve parts before installation procedures

Metal seat butterfly valves must be completed in strict accordance with the steps required before and after assembly. This paper mainly introduces the metal seat butterfly valve parts before assembly must go through the processing process, as follows:

1, according to the processing requirements, some parts need to be polished, the surface can not have processing burr;

2, Degreasing of all parts;

3, metal seat butterfly valve degreasing after the completion of pickling passivation (cleaning agent does not contain phosphorus);

4, after pickling passivation rinse with pure water, there can be no pharmaceutical residue (carbon steel parts leave out this step);

5, one by one parts with non-woven cloth to dry, can not be retained on the surface of the parts such as wire wool, or dry with clean nitrogen;

6, Wipe the parts one by one with non-woven cloth or precision filter paper stained with analytical pure alcohol until there is no dirty color.