The parts of the valve must be treated by the following process before the assembly is assembled:

1. According to the processing requirements, some parts need to be polished, the surface can not have processing burrs, etc.

2. All parts are degreased.

3. After the degreasing is completed, acid washing and passivation are carried out, and the detergent is not phosphorous.

4. Rinse with purified water after acid cleaning, and no pesticide residues can be found. Carbon steel parts can save this step.

5, one by one, the parts are dried with non-woven fabrics, and they can not retain the surface of the components such as wired hair or dry with clean nitrogen.

6, use non-woven or precision filter paper to analyze pure alcohol on one by one, until there is no dirty color.

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