Is it required that the oxygen valve not be a quick-opening valve? Is there a specified speed for starting quickly?
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As the title says, thank you all, experts
Generally speaking, for quick-opening valves, the time from closed to fully open should not exceed 2 seconds. It’s a pity I didn’t get a chance to touch the oxygen valve; I’m not sure if it can be opened quickly. I know that the internal structure of the oxygen valve is very simple, but the material requirements are quite high. Generally, Monel is chosen, or Cornell
Who says the oxygen valve cannot be opened quickly? There are always prerequisites for this. For example, oxygen cannot be introduced into the second stage of the natural gas conversion furnace rapidly, in order to avoid a sudden rise in temperature that could lead to serious accidents; this requirement applies to all reactions that use oxygen as an oxidizing agent. However, in the case of the oxygen vent valve located before the device, it is necessary to open it quickly in situations of sudden temperature rises – the faster, the better – with the aim of preventing accidents. So, it’s not possible to make generalizations
Oxygen valves must not be quick-opening valves; if there is a large pressure difference before and after the valve, or if there are metal particles in the pipeline, friction between the oxygen and these particles can cause a fire, leading to an explosion that burns everything up instantly.
To ensure fast closing, you need to rely on the design of the valve; generally, shut-off valves are of the fast-closing type. You can achieve slow closing by adding a gearbox.
It is stipulated by the standards that quick-open/quick-close valves cannot be used for oxygen pipelines, and this is a mandatory requirement
May I ask which standard this requirement comes from? I haven’t worked on any projects involving oxygen; thank you for your advice!
It seems to be an oxygen valve; quick-opening valves cannot be used. The choice has to be based on the actual circumstances, as the speed of quick-opening valves is determined according to the specific conditions on site
\"Quick open\" has two meanings: 1. The flow characteristic is quick opening. For example, with a manual gate valve, just turning it two turns already results in a high flow rate, which causes the oxygen flow velocity in the pipeline to change rapidly; this is what the specifications state for the 9th floor. 2. The action requirement is to open quickly. It generally refers to automatic control valves or interlocked switch valves (the shutdown time of the O2 cut-off interlocked valve is usually less than 2 seconds), which is a requirement of the process operations. This is the understanding of the 3rd floor. Regarding the material of valves, the specifications allow for the use of \"stainless steel\" or \"stainless steel + copper-based alloy\". For automatic valves, we generally use copper-based alloy for the valve core/seat, while stainless steel can be used for manual valves; the reason for this is as mentioned above – after all, manual valves can be opened slowly by hand. Of course, the manual valve can also have a valve core made of copper-based alloy, though this increases the cost.