Dry gas seal system
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What are the functions of the pre-pressure gas, sealing gas, isolation gas, and the pressure difference between the pre-pressure gas and the balance tube? I can’t upload photos; I don’t know why
The pre-sealing gas serves to isolate the medium gas, while the isolation gas is used to separate the lubricating oil. The sealing gas lies between these two. In a dry gas seal, an air film is formed between the rotating and stationary rings; this is different from mechanical seals where there is direct contact. The pressure difference between the pre-sealing gas and the balance tube, as I understand it, is the pressure difference between the driven end and the undriven end