What are the cleaning steps and assembly requirements for gas valves and cylinder valves?

Cleaning steps:
The components of gas cylinder valves must undergo the following processes before assembly:
1. According to the processing requirements, some parts need to be polished, and the surface must not have processing burrs;
2. All parts are degreased;
3. After degreasing is completed, pickling and passivation is carried out, and the cleaning agent does not contain phosphorus;
4. Rinse with pure water after pickling and passivation, and there should be no chemical residue, and this step is omitted for carbon steel parts;
5. Wipe the parts with non-woven fabrics one by one, and do not leave the surface of the parts such as wire hair, or dry them with clean nitrogen;
6. Wipe the parts one by one with non-woven fabric or precision filter paper dipped in analytical pure alcohol until there is no dirty color.

Assembly Requirements:
Cleaned parts must be kept sealed for installation. The requirements for the installation process are as follows:
1. The installation workshop must be kept clean, or a temporary clean area should be built, such as using newly purchased color strips or plastic films, etc., to prevent dust from entering during the installation process.
2. Assembly workers must wear clean cotton work clothes, cotton caps, no leakage of hair, clean shoes, plastic gloves, and degreased hands.
3. Assembly tools must be degreased and cleaned before assembly to ensure cleanliness.