For system nitrogen pressure replenishment, should it be a gate valve + check valve or two gate valves?
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For the nitrogen pressure supplementation system of equipment such as the reflux tank inside the unit, should the nitrogen pipelines be equipped with a gate valve + check valve or two gate valves? Is there a conflict between the design and actual on-site operations?
Gate valves and stop valves in a dual-valve set; sometimes a check valve is added, or two check valves
Check valves should be installed on nitrogen lines to prevent backflow into the nitrogen system
Under normal circumstances, in addition to the check valve, there should also be a double valve with backflow prevention and an 8-shaped blind flange.
Check valve, dual-valve assembly with eight-shaped blind plates, and also a drain pipe are required