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Question:

Why does the ball valve on the DN15 fail to mark the pressure level?

Why does the ball valve on the DN15 fail to mark the pressure level?

Answer:

Is it marked on the valve body or on the label, as specified by the product designer?.
PN, DN, body materials, trademarks, these 4 are the signs that must be used.
According to GB 12220-89 nominal diameter less than 50mm valve

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