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Thread: 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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    DIY Junior Member hamlet_jones's Avatar
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    Default 1/2 valve on 3/4 line, 3/4 valve on a 1-1/2" line, etc. like that... Head loss?

    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

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default

    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.
    Licensed residential and commercial plumber

  3. #3
    DIY Junior Member hamlet_jones's Avatar
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    Default

    Thanks. I found a helpful table, below. I need to think on this.

    http://www.engineeringtoolbox.com/pv...ngs-d_801.html

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