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About skim valve requirements and testing procedures

日期:2013/6/10

1, the cleaning steps:
         Valve parts before assembly must be handled as follows:
1) According to the processing requirements, some parts need to make polished surface can not have machining burrs, etc.;
2) All parts degreasing treatment;
3) After degreasing pickling passivation (cleaning agent without phosphorus);
4) After pickling passivation rinse with pure water, can not have drug residues (carbon steel parts omitted this step);
5) non-woven wipe with parts one by one, can not wait wired hair retained the part surface, or with a clean dry nitrogen;
6) or with a non-woven filter paper moistened analytical precision parts individually alcohol wipe until no dirty colors.

2, assembly requirements
Cleaned parts must be sealed for installation. The installation process requires the following:
1) installation workshop must ensure clean, or clean up temporary area (for example, purchased with a new color of the cloth or plastic film, etc.) to prevent dust entering the installation process.
2) assembly workers must wear clean cotton overalls, wearing a cotton cap, hair can not leak, clean, wearing shoes, wearing plastic gloves (skim).
3) assembly tools must be used for degreasing and cleaning before assembly to ensure cleanliness.

3, other requirements
A) the completion of the valve assembly purged with nitrogen at least 1 minute.
2) tightness test must be conducted with pure nitrogen.
3) tightness test after passing the envelope, with a clean polyethylene cap sealed polyethylene cap soaked before use organic solvent, wipe clean.
4) and then vacuum sealed.
5) the final packing.
6) During transport to take measures to ensure entrapment is not damaged.

4, acceptance requirements
Acceptance follow HG 20202-2000 "skim construction and acceptance norms", are each part before assembly with a clean filter paper to wipe precision (selection means dead), filter paper the same color as qualified.

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