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What does the ‘1’ in P4 and P5 in valve codes represent?

2009-04-07View Original

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What do P4 and P5 mean in valve codes?
Reply #22009-04-07
It should be the same as that for pumps, indicating the protection rating
Reply #32009-04-07
It should be the tolerance grade codes P2, P4, P5, P6, P6x – the ordinary grade is not indicated.

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