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Has my Procon pump had the fritz?

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  • Has my Procon pump had the fritz?

    Holy Cow guys, this Bezzera Im installing isnt going in without a fight!!

    On the bench I was just running direct line pressure into the machine, we have quite high pressure here, around 650 Kpa. On the permanent install Im using a 350 Kpa PLV  to regulate the pressure. Its sharing a connection with a flick mixer and it definitely needs the PLV as those mixers really give the line a hard time, I had no idea just how much until I saw it on the machines gauge.

    When I went to adjust the pump for the reduced line pressure I simply cant get enough pressure differential with 350 Kpa. Even wound fully in I can only get about 8 bar. It adjusts, just not up high enough. I took the PLV out, at that outlet we have about 5 Kpa, and I can adjust the pump pressure up to 10 bar with a blind portafilter, and back down to normal brewing pressures with a shot, no problems. When running the pressure is stable.

    I would prefer to run as low input pressure as possible, so dont want to exchange the 350 Kpa PLV for a 500. Im assuming that even if sucking (negative inlet pressure), the Procon pumps should be able to be adjusted up to 9 Bar without any difficulty? These pumps arent cheap so Im a bit peeved right now. Before I go fork out yet more hard earned on a new pump I thought Id get the opinions of others as to whether it IS indeed likely that its fried, or possibly something else Ive overlooked? BTW the pump looks like a series 1 and has been thoroughly descaled and the inlet filter is clean.

    Cheers,
    Pete


  • #2
    Re: Has my Procon pump had the fritz?

    hi pete
    have you dissmantled the bypass on the pump

    could be that the piston is sticking, needs cleaning and some lube

    could also try adding a 350 kpa pressure limiter after the machine and before the flick mixer

    dont know how much this would help, without testing it

    other suggestion is to put a non return tap (or Duo Valve) for the coffee machine supply
    this way when you draw water for the flick mixer you wont pull water off the machine line


    graham

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    • #3
      Re: Has my Procon pump had the fritz?

      Originally posted by fix link=1229060604/0#1 date=1229069367
      hi pete
      have you dissmantled the bypass on the pump

      could be that the piston is sticking, needs cleaning and some lube

      could also try adding a 350 kpa pressure limiter after the machine and before the flick mixer

      dont know how much this would help, without testing it

      other suggestion is to put a non return tap (or Duo Valve) for the coffee machine supply
      this way when you draw water for the flick mixer you wont pull water off the machine line


      graham
      Hey Graham! Hmmm, yeah thats not a bad idea to try that PLV on the flick tap, its just sitting there at the moment and theyre both 1/2". Even if I had to buy another one for the machine we have such shocking water hammer (hardly surprising with that pressure) it could help reduce that problem, at least in the kitchen.

      Ive had the pumps piston out and its clean but could do with some lube. Its adjusting ok but I have some "correct" lube coming (seeing as you didnt like my olive oil trick) so no harm in trying that.

      I may have to install the isolation valve as you suggest. I had it in my hand but when he told me the price I said dont worry about it, Ill just use a shut-off valve. In practice its not a big deal since its a domestic install, so the tap wouldnt be used while pulling a shot, but it could still be worth it as that tap will hammer the heck out of the machine ... and goodness knows its life has been hell before I got hold of it!!

      Pete

      Comment


      • #4
        Re: Has my Procon pump had the fritz?

        is this your house or a rental

        if it is your house, you should get a pressure limiter fitted, on the house side of your water meter
        this will help your water hammer problem, it will also help to extend the life of your tap rubbers, and reduce the risk of leaks occuring in the water pipes

        Comment


        • #5
          Re: Has my Procon pump had the fritz?

          Hi Pete,

          could be your pump is fitted with a 5 bar spring in the relief valve (5+3.5 = 8.5 ). I cant remember if there is a way to tell which one it is but if you ring Roehlen Industries in Melbourne (03) 9580-4155 you will be able to get the correct one for not to many $$, they also have rebuilt pumps for sale as well (worst case)

          good luck

          Comment


          • #6
            Re: Has my Procon pump had the fritz?

            Originally posted by beanflying link=1229060604/0#4 date=1229118329
            Hi Pete,

            could be your pump is fitted with a 5 bar spring in the relief valve (5+3.5 = 8.5 ). I cant remember if there is a way to tell which one it is but if you ring Roehlen Industries in Melbourne (03) 9580-4155 you will be able to get the correct one for not to many $$, they also have rebuilt pumps for sale as well (worst case)

            good luck
            A 5 Bar spring? Ok, I hadnt even heard of them. Are they designed for situations with high inlet pressure? Im away at the moment but will pull it apart when I get back and have a look. It may even be possible to shim the spring out or do something else creating as a temporary measure to see if it makes a difference to the adjustment capabilities. The thing that threw me was that the pump was otherwise rock solid so looked perfectly serviceable. Replacing the pump for a new one isnt the end of the world, it was more disappointment having spent a large amount of time and effort bringing it back from the dead to continue to find its still not 100% despite weeks of running perfectly on the bench Oh well

            Comment

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