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  • Water filter and pressure limiter plumbing order

    Does it make any difference whether a pressure limiter is in front or behind the water filter for plumbing to an espresso machine?

  • #2
    Re: Water filter and pressure limiter plumbing ord

    Gday yoma,

    Yes, it does mate. Most filter systems are required to work at below the pressure that most municipalities supply water to the front gate. Just check with the vendor from whom you bought the filter system and they should be able to tell you. Our filter system has this stated on the documentation that came with it.

    If your vendor cant help you, Attilio from CosmoreX Coffee is very au fait with such things and should be able to provide you with valuable advice. All the best,

    Mal.

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    • #3
      Re: Water filter and pressure limiter plumbing ord

      hi
      fit the pressurer limiter before the filter

      graham

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      • #4
        Re: Water filter and pressure limiter plumbing ord

        Originally posted by fix link=1230815251/0#2 date=1230852127
        fit the pressurer limiter before the filter
        Thats what I think...

        In Scott Raos book, he describes the order as:
        "... water treatment, pressure bladder, pressure restrictor, and espresso machine."
        "The water treatment is first because the pressure output of most systems fluctuate"

        The context for the above is "other machines competing for water with the espresso machine" -  which is not an issue in my case.  However would the possible variance in water treatment output be an issue?

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        • #5
          Re: Water filter and pressure limiter plumbing ord

          yoma,

          I have my pressure regulator after the water filter (water softener)...... as the water filter is rated at a much higher pressure than the mains I didnt worry about the pressure damaging the filter.

          Yes, there will be some drop in pressure across the filter and the amount will depend on the flow rate. However if the filter is adequately sized, that drop should be minimal and shouldnt affect the pressure at the group by any significant amount.

          I dont think it makes much difference either way..... I left mine as it was when the machine was removed from the cafe where it had been professionally installed...... so just assumed that was the correct way (and it seemed to make sense to me to do it that way).

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          • #6
            Re: Water filter and pressure limiter plumbing ord

            Thats interesting JB,

            The installation docs that came with my setup clearly advise fitting the PLV before the filter system and on the cartridge it states a similar recommendation. Maybe its best to contact the supplier of your hardware "yoma" if the documentation comes up a bit short on information about this....

            Mal.

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            • #7
              Re: Water filter and pressure limiter plumbing ord

              Mal,

              I guess some of the cartridge filters (those designed specifically for coffee machines) have a lower pressure rating and have to go after the PLV where as the large stainless steel "tank" softener I am using is often used on machines (not La Cimbalis :) without a PLV..... so is rated at full mains pressure - and then some....

              Regardless of where it is installed I cant see it having any real effect on the brew pressure - but having it after the cartridge might cause premature (and very messy :-[) failure of the filter casing!

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              • #8
                Re: Water filter and pressure limiter plumbing ord

                Hi all,

                the reason to fit a PLV last is that as a filter gets more clogged the pressure losses across the filter increases so if you are installing it after the PLV your input pressure to the pump will decrease along with the brew pressure. If you install it before the PLV providing the PLV operates reliably the pump gets the same pressure regardless of the filter (until it gets so blocked you starve the pump ). Providing you change filters fairly often if you fit it the other way around then it wont be a major drama.

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                • #9
                  Re: Water filter and pressure limiter plumbing ord

                  According to a service technician at one of the major coffee/cafe equipment suppliers, they install the PLV before the water filter/conditioner.

                  I guess it depends on the type of water filter being used.

                  The datasheet for mine doesnt specify any restrictions. Ill switch my PLV after the filter next chance I get and see if it theres any difference on the brew pressure meter and/or cooling flush flow.

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                  • #10
                    Re: Water filter and pressure limiter plumbing ord

                    Fit the pressure limiting valve (a 350 kPa) immediately after the stop cock and BEFORE the water filter / depurator.

                    Then sit back , relax, and enjoy the coffee.

                    Regardz,
                    Attilio
                    first / original CS site sponsor.

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