Why must oil be prevented from entering the oxygen valve?

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Cleaning procedures and inspection standards for oil-free degreased imported oxygen valves. I. Preparation before degreasing: 1. The personnel carrying out the work prior to degreasing must understand the importance of degreasing the valves as well as removing water from them; if the internal cleaning of the valves is not done properly, it can lead to serious consequences such as damage to equipment or injury to people. Therefore, operators must be familiar with the entire content of these specifications. 2. Management and security at the degreasing site must be strengthened. To prevent accidents, open flames and smoking must be strictly prohibited at the operation site, and unauthorized personnel must be kept out. The site must be kept well-ventilated, clean, and dry, and must be equipped with fire-fighting facilities. II. Cleaning steps: The components of oil-free and degreased oxygen valves must undergo the following treatment before assembly: 1. Depending on the processing requirements, some components need to be polished, with no machining burrs or similar defects on their surfaces ； 2. All components are degreased ； (Degreasing process: The process of removing oil from the surface of parts using degreasing solvents such as acetone, alcohol, or other inorganic, non-flammable cleaning agents.) 3. After degreasing, acid washing and passivation are carried out (the cleaning agent contains no phosphorus) ； 4. Dry each component individually using non-woven fabric, ensuring that no fibers or similar residues remain on the surface, or dry it with clean nitrogen gas ； 5. Irradiate the valve surface with a LUYOR-2130 ultraviolet lamp (black light); no fluorescence indicates compliance. III. Other requirements: 1. The assembled valves must be purged with nitrogen for at least 1 minute. 2. The airtightness test must be conducted using pure nitrogen. 3. After passing the airtightness test, encapsulation is carried out by sealing it with a clean polyethylene cap; the polyethylene cap should be soaked in an organic solvent before use and then wiped clean. 4. Then seal it with a vacuum bag. 5. Pack after ZUI. 6. Measures should be taken during transportation to ensure that the packaging remains intact. IV. Acceptance requirements: 1. Wipe the surface of the degreased parts with oil-free, dry white filter paper; it is considered acceptable if no traces of oil remain on the paper. 2. Compliance with HG 20202-2000 \"Specifications for the Construction and Acceptance of Degreasing Projects\" is required. Before assembly, each component should be wiped with clean, precision filter paper (focusing on the hard-to-reach areas of the components); it is considered acceptable if the color of the filter paper does not change. Only by strictly following the above steps can oxygen-specific valves leave the factory and be used safely!