Before assembly, valve components must undergo the following processes:
Depending on processing requirements, some components require polishing, ensuring the surface is free of burrs;
All components undergo degreasing;
After degreasing, undergo acid pickling and passivation using a phosphorus-free cleaning agent;
After acid pickling and purification, rinse thoroughly with pure water, ensuring no chemical residue remains. This step is omitted for carbon steel components;
Each component is wiped dry with a non-woven cloth, ensuring no lint or other residue remains on the surface, or dried with clean nitrogen;
Each component is then wiped with a non-woven cloth or precision filter paper dampened with analytical grade alcohol until no stains remain.
