1/2 valve on 3/4 line, 3/4 valve on a 1-1/2" line, etc. like that... Head loss?

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hamlet_jones

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Howdy,

I tried a search, and engineers toolbox .com, but I couldn't find nuthin.

Is the head loss appreciable for using an undersize valve in a system that's otherwise one size all the way thru?
Does necking down a little make much difference, or, head loss overall?

My system is 1100 feet, 1-1/2" line all the way thru, except 1" at the make-up places at the ends. I run
5-10 gpm depending on where the pressure's at during the cycle.

If anybody has a link to a chart for pressure drop or head loss for valves,
I'm all ears.

Thanks
 

hj

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Head loss is a function of pipe size and velocity. Therefore, since you have a very low velocity, the smaller connections at either end are inconsequential. Now, if you were trying to put out a forest fire, it would be a major restriction/factor.
 
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