Oxygen valves In the physicochemical experiments, gases such as oxygen, nitrogen, hydrogen, and argon are often used. These gases are typically stored in dedicated high pressure gas cylinders. In use, the gas pressure is reduced to the required range by the pressure reducing valve, and then finely adjusted by other control valves to make the gas input into the system. The most commonly used pressure reducing valve is an oxygen pressure reducing valve, referred to as an oxygen meter.
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