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The selection is as follows: Globe valve J21W-40P PN4.0MPa DN15 Φ22. What does Φ22 mean? Is it the outer diameter or the inner diameter of the pipe to be connected? Can I find out the specifications of the connecting pipes using this model? Thank you.
Answer: Φ22 is the outer diameter of the connection pipes at the outlet and inlet of the needle valve.
Φ22 is the outer diameter of the pipe； DN15 refers to the nominal diameter, which is the inner diameter of the pipe. From this, it can be determined that the wall thickness of this pipe is 3.5 mm. :)
I’d like to gently point out that DN refers to the diameter of the pipe, not its inner diameter. The opinion expressed above is incorrect; based on experience, Φ22 should correspond to DN20. Even for pipes of the same model, the inner and outer diameters can differ, so it’s necessary to refer to the relevant standards for pipes