Regarding the selection of check valves? --One-way valve for nitrogen inlet of air storage tank
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Currently, there is a consideration that if all the air compressors in the workshop fail, an emergency air source will be needed; therefore, nitrogen is being considered as such an emergency source. However, there is concern that the pressure in the nitrogen pipeline might drop, and that air might mix into the nitrogen pipeline during use. Hence, it is thought necessary to install a one-way valve. Which type of structure would be suitable?
This is possible; as long as a certain pressure difference is set, this is the approach used.
Only the check valve is unreliable; it is necessary to add an emergency shut-off valve and establish a interlock system such that nitrogen is introduced in case of abnormalities, while it remains closed under normal conditions, thereby preventing dangerous cross-contamination of gases
Check valves are absolutely unreliable, and the use of air in place of nitrogen poses safety risks
In summary, it is possible to use a cut-off valve together with a check valve: lol