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1 Key point: How does the oxygen valve work and how is it used? When it comes to oxygen valves, many people think of oxygen meters; this commonly used oxygen valve is also known as an oxygen pressure regulator. Oxygen valves are frequently used in physical and chemical experiments, and gases such as oxygen, nitrogen, hydrogen, and argon are often required. All of these gases mentioned above are stored in a high-pressure gas cylinder, which is of course a specialized type. During use, the pressure of these gases is reduced to the range required for the experiment through a pressure relief valve, and then fine adjustments are made using other valves to feed these gases into the system in use. Working principle of the oxygen valve: The high-pressure chamber of the oxygen valve is usually connected to the gas cylinder, while the low-pressure chamber serves as the outlet for the gas, which generally leads to the system where it is used. The gas pressure stored in the cylinder is indicated by a high-pressure gauge, while the outlet pressure of the low-pressure gauge can be effectively controlled using an adjustment screw. Generally, oxygen valves are equipped with safety valves, which are used to protect the pressure regulator and ensure its safe operation. At the same time, the safety valve also functions as a pressure relief valve and serves as a signaling device in case of a fault; if the pressure relief valve malfunctions, the safety valve will give a clear indication. How to use an oxygen valve: When using an oxygen valve, it is essential to follow the specified procedures; this way, no problems will arise during operation. Moreover, the oxygen valve should not come into contact with grease, otherwise a fire hazard may occur. When stopping operation, the remaining gas in the valve must be completely released, and the adjustment screw should be set in a relaxed position; this helps to prevent deformation due to prolonged pressure. The above is the information related to oxygen valves. Consumers should be well aware of this information when using them, so as to make better use of them. 2 What are the reasons for leaks in cryogenic valves? Cryogenic valves have a very wide range of applications, and strict requirements are placed on the materials used in their construction. They are called cryogenic valves because they are typically used in environments where the temperature of the medium is quite low. The use of low-temperature valves enables effective temperature control, helping to prevent safety hazards such as explosions or leaks. So, what are the reasons for leaks in low-temperature valves during use? Actually, there are mainly the following two points. I. Internal leakage: The reason why low-temperature valves experience internal leakage is mainly that the seals deform at low temperatures. This occurs because the temperature of the medium drops to a level at which the material undergoes a phase change, resulting in changes in the material’s volume. As a consequence, the sealing surfaces, which require high precision in their fabrication, become warped, leading to poor sealing at low temperatures and thus internal leakage. II. External leakage: External leakage is mainly caused by problems in the connection between the valve and the pipeline; for example, issues with the gaskets used for connection, the bolts, or other connecting elements. At low temperatures, the materials involved contract at different rates, which ultimately leads to leakage. In summary, low-temperature valves must be used in accordance with the specified requirements, and they should be placed in an appropriate environment during subsequent use; this will help to prevent deformation of the material and avoid leakage issues. These are the reasons for leaks in low-temperature valves; it is essential to pay close attention during their selection and use to prevent safety accidents. If a leak occurs during use, it must be addressed promptly. When making a choice, it is essential to select low-temperature valves produced by reputable manufacturers, as those from such manufacturers offer better quality assurance.