Regarding the selection of pressure relief valves, they are for air and hydrogen media respectively
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1. It is used for the combustion air in the heating furnace, and it is required that the pressure be reduced from 0.07 Mpa to 0.015 Mpa. Some manufacturers believe that this pressure range is not appropriate; is this true? Is the multiple too high or is the inlet pressure too low? I am extremely grateful for someone who can make the choice for me. Also: If single-stage decompression isn’t possible, what about two-stage? 2. Regarding the hydrogen medium, someone said that pressure regulators were not suitable (as there were no appropriate ones), and I didn’t think much about it at the time; later I realized that there was actually one location in the factory where a pressure regulator was already in use (a disc-type one? It looks like it’s pointing in the direction of a UFO). May I ask, is what this person said correct?
In our workshop, we use H21X-40p DN15 for electrolytic hydrogen production
The one upstairs is a check valve; we’re talking about a pressure reducing valve
It seems the pressure is too low; I checked online and found that pressure reduction is applied only when it’s above 0.15 MPa How about checking with professional manufacturers?
It turns out that the furnace ventilation system in our factory is not equipped with pressure reducing valves; instead, dual valves and duct butterfly valves are used to regulate pressure and airflow. The pressure resulting from pressure reduction can sometimes be insufficient. For hydrogen pipelines, flow regulation as well as pressure regulation valves are used to control pressure and flow, and there are no dedicated pressure reducing valves – this is for reference only
Poster: The required valve dimensions, flow rate, and other parameters need to be provided
Original poster, there’s no problem; the answer is as follows: 1) Regarding the pressure reduction valve that reduces pressure from 0.7 bar to 0.15 bar, I’m not sure about other manufacturers, but Emerson/Fisher can produce such valves. For example, the first stage of their 95L series can reduce pressure to the range of 0.14–0.41 bar. There’s nothing special about it; the port size is 1/4” (DN6). Of course, to determine the exact model and price, you’ll need to provide detailed specifications. 2) What is special about hydrogen? There are also many cases where oxygen uses pressure regulators. Therefore, it is definitely wrong to say that hydrogen is not suitable for use with pressure regulators. The part that looks like a flying saucer is the diaphragm of the pressure reducing valve. For such valves, the lower the downstream pressure, the larger the diaphragm required, which gives it a more disc-like appearance. In short, to select the appropriate pressure relief valve, it is essential to provide complete information about the site conditions; otherwise, it will affect accuracy or even prevent the valve from functioning. Feel free to reach out if you have any questions. Li Xuming 13910754975 lixuming@263.net
Thank you to the person above; it seems like an expert, but the design institute has already chosen a different model. In the engineering field, there are many things that don’t have time to be examined in detail……