Selection between single-seat and double-seat valves?
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When should a single-seat valve be chosen? When should a two-seat valve be chosen?
To put it plainly, it’s a book. You can refer to the specifications for the selection and design of automated instruments for this.
Simply put, single-seat valves have better sealing performance, but they are suitable for applications with a small pressure difference before and after the valve, whereas double-seat valves are the opposite. :)But there is always a certain amount of leakage, as long as it remains within the limits permitted by the standards.
The 3rd floor is the correct choice; as long as the pressure difference before and after and the sealing quality meet the requirements, it’s fine