Leakage level of a 1-meter-diameter shut-off valve
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For a DN1000 flue gas pipeline with a pressure of 3 kPa and a temperature of 353 degrees, what level of leakage performance is appropriate for the electric shut-off valve used there? Is it possible to achieve a V-level leakage rate? Some manufacturers claim that they can achieve a leakage level of less than 1%; is it possible to reach a V-level indeed?
The 1% internal leakage rate you mentioned refers to ordinary ventilation butterfly valves. Such valves are used in flue gas pipelines; there is no sealing surface between the disc and the valve body, resulting in an internal leakage rate of around 1%. The valve body of these valves is made by welding steel plates together, rather than being cast, which makes the valve body lighter and cheaper. It is possible to make these valves leak-free by adding reinforcement to the disc; however, their price is higher than that of ordinary ventilation butterfly valves. They are still much cheaper than triple-eccentric butterfly valves. If you need them, feel free to contact me at any time.
There are design and manufacturing standards: the design standard is GB/T2238-1989, and the structural length standard is GB/T12221-1989
GB/T2238-2008 Method for the determination of melamine in raw milk and dairy products; Has the standard changed now?
I’m not sure about that. I work in sales, and the standard mentioned earlier was something I saw in our product manual; I’m not familiar with the specific details of that standard.