The components of the valve must be processed through the following processes before assembly:

1. According to the processing requirements, some parts need to be polished, and the surface cannot be processed with burrs;

2. All parts are degreased;

3. After the degreasing is completed, the acid is washed and passivated, and the cleaning agent does not contain phosphorus;

4, after pickling and purification, rinse with pure water, there can be no drug residue, carbon steel parts save this step;

5. Dry the parts one by one with a non-woven fabric, and do not leave the surface of the parts such as wire wool, or blow dry with clean nitrogen;

6. Use a non-woven fabric or a precision filter paper to analyze the pure alcohol and wipe each component one by one until there is no dirty color.