1, the cleaning steps: valve components must be processed before the assembly process: 1) According to the processing requirements, some parts need to be polished, the surface can not have burrs, etc .; 2) All parts are degreased; 3) After degreasing passivation pickling (cleaning agent does not contain phosphorus); 4) pickling passivation purified water rinse, there is no drug residue (carbon steel parts omitted this step); Wipe the fabric dry, do not retain the surface of the wire wool or other parts, or dry with clean nitrogen; 6) with non-woven or precision filter paper on the analysis of pure alcohol wipe parts by component until there is no dirty. 2, assembly requirements Clean parts must be sealed for installation. The requirements of the installation process are as follows: 1) The installation workshop must be clean, or a temporary clean area should be set up (for example, with newly purchased colored stained cloth or plastic film) to prevent dust from entering the installation process. 2) The fitter must wear clean cotton overalls, a cotton cap, no hair loss, clean shoes and plastic gloves (skim). 3) Assembly tools must be degreased and cleaned before assembly to ensure cleanliness. 3, other requirements 1) The valve assembly is completed purging with nitrogen for at least 1 minute. 2) Airtight test must use pure nitrogen. 3) airtight test after the envelope, with a clean polyethylene cap seal, polyethylene cap used before the application of organic solvent soaked, wipe clean. 4) Then use a vacuum bag to seal. 5) the last packing. 6) During transportation, take measures to ensure the envelope is not damaged. 4, acceptance requirements Acceptance follow HG "skim construction and acceptance of norms", before assembly, each component is cleaned with a clean filter paper (choose the dead parts), filter paper unchanged color is qualified.
Wax Injection Machine,Servo Wax Injection Machine,Automatic Wax Injection Machine,Wax Injection Machine For Investment Casting
Dongying Fuhao Precision Casting Science & Technology Co.,Ltd , https://www.fh-cast.com