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Thread: main water line has two pressure regulators???

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    DIY Junior Member tikicarver's Avatar
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    Default main water line has two pressure regulators???

    I found out I have two pressure regulators installed on the main water line, I'm guessing this is not normal.
    Is there a reason to do this?

    He is what I have, water meter, gate valve, pressure regulator, 100ft of 1 1/4 PVC, then at entrance of house, 1" copper, gate valve, pressure regulator.

    I have to replace the main PVC line because it has a leak. Where is the pressure regulator normally located?

    Also, I measured the pressure after the second regulator and is is 90 PSI.
    That seems a little high to me.
    what should it be?

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Two regulators are normally used when the initial pressure is extremely high. If the house is much higher than the meter, the regulator should go at the house to avoid losing pressure due to elevation. A regulator at the house is also, usually, easier to adjust, maintain, and replace.
    Licensed residential and commercial plumber

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    Plumber jimbo's Avatar
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    Norm is 40 to 80....90 is a tad too high. As mentioned by the Oracle from Sedona....it is preferred to NOT step down nearly the full range of a reducing valve in one step. If your street pressure is over 200, that would be reason to use two. They would normally NOT be the same model #

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    Retired Defense Industry Engineer jadnashua's Avatar
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    If you read the specs on most PRV's, they have a limit on the max pressure drop that they can achieve. So, with high pressure, it may be necessary to do it in steps.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Junior Member tikicarver's Avatar
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    At my house the water meter is up a hill and is actually higher than my roof line.
    I measured right after the meter and it was 90 PSI, then meassured after the regulator at the
    entrance of the house and it was 90 PSI, so looks like they are both set at 90 PSI.
    I also measured at the opposite end of the house at a hose bib and it was about 80 PSI.

    So if I adjust them, what should I do,
    Lower both or just lower the one at the house.
    There is 100ft between the meter and the house.

  6. #6
    Moderator & Master Plumber hj's Avatar
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    A regulator at the meter protects the house line from high pressures if you have a pipe that could be affected by them then that is where to put it. Otherwise, you will get the best service from one at the house, and for your situation, if you have described it properly, you only need one of them. Both of yours are probably broken.
    Licensed residential and commercial plumber

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