Briefly describe the steps and inspection standards of the degreasing valve

1. Cleaning steps:

Valve components 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) pickling passivation after degreasing is completed (cleaning agent does not contain phosphorus);

4) After pickling and passivation, rinse with pure water, there is no residual drug (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) Wipe the parts one by one with non-woven fabric or precision filter paper and analyze the pure alcohol until there is no dirty color.

2. Assembly requirements

The cleaned parts must be sealed and stored for installation. The requirements for the installation process are as follows:

1) The installation workshop must be clean, or set up a temporary clean area (such as the use of newly purchased color strips or plastic film, etc.) to prevent dust from entering during the installation process.

2) The assembly worker must be dressed in clean cotton overalls, wearing a cotton cap, hair should not leak, wear clean shoes, and wear plastic gloves (defatted).

3) The assembly tool must be degreased and cleaned before assembly to ensure cleanliness.

3. Other requirements

1) The assembled valve is purged with nitrogen for at least 1 minute.

2) The airtight test must be pure nitrogen.

3) After the airtight test is passed, encapsulation is carried out, sealed with a clean polyethylene cap, and the polyethylene cap is soaked with an organic solvent before use and wiped clean.

4) Then seal with a vacuum bag.

5) Final packing.

6) Measures should be taken during transportation to ensure that the envelope is not damaged.

4. Acceptance requirements

Acceptance follows HG 20202-2000 "Degreasing Engineering Construction and Acceptance Specifications". Each component is cleaned with clean precision filter paper before assembly (select component dead angle). The color of the filter paper is qualified.