Hydrogen valve
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I would like to ask the experts: what type of valves should be used for hydrogen pipelines with diameters of DN250 and DN125 (at 0.35 MPa)?
I’m waiting for an expert’s reply. I have indeed supplied valves for hydrogen production plants with small diameters; Swagelok and Parker’s control valves as well as process valves work well, but I’m not entirely sure about valves for this specific diameter
It is specified in GB4962 (Safety Technical Regulations for Hydrogen Use), but for valves of this size, butterfly valves are recommended, with the material to comply with the regulations.
I have another question: what specific model should be used for the butterfly valve, what is the pressure rating, and what material should be used for the packing?
The standard recommendations are ball valves and globe valves; 250 isn’t that large
It may be difficult for you to open a manual DN250 ball valve by yourself, and installing a globe valve should also be quite challenging. D341H will do
I don’t know why a gate valve wasn’t chosen? ~~~
According to Standard GB50117-2005, Design Code for Hydrogen Stations, clause 12.0.3 states that the selection of valves for hydrogen pipelines shall comply with the following requirements: ① Ball valves and globe valves are preferred for valves used in hydrogen pipelines.
Many people choose butterfly valves or triple-eccentric butterfly valves, but care should be taken regarding hydrogen embrittlement