Stainless steel ball valve before assembly and after assembly should be strictly in accordance with the requirements of the steps to complete, must pass before stainless steel ball valve parts in the assembly process, specific as follows: 1)
According to process requirements, some parts need to do polishing processing, surface can't be machining burrs, etc. ;
All parts for degreasing process;
After the completion of the stainless steel ball valve degrease pickling passivation (
Detergent containing phosphorus)
After pickling passivation with pure water is rinsed clean, cannot have pharmaceutical residues (
Carbon steel parts leave out this step)
Dry individually parts with non-woven fabric, not the cable MAO retained components such as surface, or use a clean dry nitrogen;
With non-woven fabric or precision filter analysis of pure alcohol to wipe components one by one, until no dirty color.
Stainless steel ball valve installation of other requirements: 1)
Fabricated stainless steel ball valve with nitrogen purging at least 1 minute;
Air test must be pure nitrogen;
Air test qualified junior stuff, with a clean PE cap seal, polyethylene cap before using organic solvent soak, wipe clean;
Then use sealed vacuum bag;
The final packing;
In the process of transportation to take measures to ensure the coating is not damaged.