Why is the equivalent length of a gate valve 8D, while that of a ball valve is 30D?
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Generally, it is believed that ball valves have the lowest pressure drop. But why is the equivalent length of gate valves 8D, while that of ball valves is 30D? O(∩_∩)O Thank you
It might be because of the different types of ball valves – there are two-piece types (with less resistance), and there are also one-piece types
Logically, no matter what type of ball valve it is, when it is fully open, everything inside is fully connected
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The one of this type that is single-piece has a reduced diameter
As stated in the book ”Flow of Fluids through Valves, Fittings, and Pipes“, the coefficient for gate valves (8fT) is greater than that for ball valves (3fT)
Ball valves generally have reduced diameters on both sides of the ball, as full-bore ball valves are very expensive. Gate valves can be considered to have a full bore, so the resistance is low.
It’s the first time I’ve heard of the concept of equivalent value; usually I just focus on buying and installing valves. It’s really interesting to learn about this
OP, let me explain what length equivalent means. Also, you need to change your signature, haha.
The equivalent length of a fitting is the length for which the local head loss caused by that fitting is equal to the frictional head loss incurred over a pipe of the same diameter over that same length; this length constitutes the equivalent length of the fitting
Was it the editor who made a mistake due to blurred vision while entering 20570? .