Why face-to-face dimensions decide whether a replacement valve fits
The valve arrives, the size and class are right, and it is 40 mm too long for the gap in the pipework. Here is where that comes from.
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Specifying notes and application guidance from our engineering team.
What a pressure class actually constrains
Class 300 is not a pressure. It is a pressure-temperature curve, and the number on the body is the least useful point on it.
Gate or ball valve: picking an isolation valve that stays shut
Both will shut a line. They fail differently, they cost differently to operate, and only one of them lets you prove the seal.