Are the valves and pipes of the right size? ?
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Who can tell me what size of valve should be used with what size of pipe? ? Also, for the DN273mm 5.3MPA steam pipeline, what is the diameter of the electric valve used for control: DN250mm or DN225mm? ? ? ? Please tell me the speed at which it’s known: handshake
It seems the original poster didn’t make things very clear? Is there a path with 273? It should be the outer wall diameter; accordingly, the nominal diameter would be DN250. If it’s a quick-cut valve, a valve with the same diameter can be chosen, while for control valves, a valve with one size smaller in diameter, such as DN200 or DN150, can be selected. This depends on the flow rate and the pressure difference before and after the valve. The range of values you provided is too wide to allow for an accurate determination
The relationship between the diameter of the electric valve and the diameter of the connecting pipeline is determined by the pressure difference before and after the electric valve; the greater the pressure difference, the smaller the diameter of the electric valve that should be chosen.
Choose pipes with a large diameter to minimize flow velocity and reduce wear, especially at elbows. The control valve can be of DN200 size; all other components should have the same diameter
Reply to 2# Chuan Nao Liao Kun: In principle, valves with a size of 250 should be used for DN273 pipes, but valves of size 225 are being used for high-pressure pipes. ? ? Why? ? ?
Reply to 5# erpeng2005: It’s very simple; it’s just that different pipeline standards are used
Since control valves require precise control, their diameter cannot be too large; therefore, diameter changes are often incorporated in the pipelines. There shouldn’t be any pipes with DN273 in the DN series; it should be DN250. So, if an electric valve is to be used, a DN250 pipe will suffice, while the control valve can be slightly smaller in size.
Reply to 7# Nanlai Beiwang9: The pipes have sizes 219, 273, and 325. . . . . . There’s 273 :)
Reply to 8# erpeng2005: What you mentioned is expressed in terms of outer diameter; there is no value of 273 when using DN. Please verify
Reply to 9# Nanlai Beiwang9: The key point is that there are no pipes with an inner diameter of 273mm either, right{:1_90:}
Reply to 10# erpeng2005: You are right