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Volumetric Bezzera BZ07 DE Update

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  • #16
    Re: Volumetric Bezzera BZ07 DE Update

    From your description of how the OPV is letting water back into the tank, it seems that the problem with the machine is something simple

    There was a blockage in the line after the OPV... something blocked the flow of the water and caused the pressure to build above the pressure release setting.

    I dont know what that blockage was, but I DO have a guess at what could have caused it.

    In short it sounds to me like like youve tightened the nut on the portafilter a bit too far, loosen it up a bit and it might actually work better

    Comment


    • #17
      Re: Volumetric Bezzera BZ07 DE Update

      No blockage and machine was tested and the pro got different volumes as well. Also machine had a big 20ml difference in the cup with no coffee in the basket.
      Thanks for the idea but not the case

      Comment


      • #18
        Re: Volumetric Bezzera BZ07 DE Update

        Originally posted by 072A3E2C2322252C0A3F0D2A3F2E4B0 link=1320467172/15#15 date=1320492471
        There was a blockage in the line after the OPV... something blocked the flow of the water and caused the pressure to build above the pressure release setting.
        Yes theres a blockage, its called ground coffee! without that youd just have hot water remember :P

        The pump in our machines runs at ~15bar, whereas you only want pressure at ~9bar, therefore if youre making coffee correctly, the opv should be releasing water back into the tank continuously while youre extracting a shot. Nothing to do with the screen or a nut or anything.

        Comment


        • #19
          Re: Volumetric Bezzera BZ07 DE Update

          Firstly:
          Before any more posts about blockage or user error, I refer you to Martys posts elsehwere:

          Originally posted by 797566606D2322140 link=1319787120/2#2 date=1319791414
          thanks,
          i placed a digital scale under my portafilter and with no coffee in basket each time i press for that same volume i programmed for it is different, the machinw will not give me the exact same volume
          and
          Originally posted by 65697A7C713F3E080 link=1319787120/6#6 date=1319796252
          Thanks kk
          I just played with the bezzera and its given me 4 out of 4 doses the same give or take 5ml with empty basket, strange ha maybe its a flow meter fault.
          so please explain the blockage or user-error theory with "no cofffee" in mind.

          Secondly:
          I thank the sponsors for their self moderation here - Martys somewhat entitled to whinge without censorship if he thinks he got an unfair deal (so long as its not below the belt!)

          Just like someone on ebay who has a 99.8% rating for thousands of sales - Im still more than happy to buy from them regardless if some individual has given them "one star" for everything. You cant please all the people all the time.

          I doubt Jetblack will see any dent in sales or satisfaction, given their massive volume of positive feedback on the other end of the scale.

          Now everybody take a deep breath before you post in this thread and think if youre actually contributing something that hasnt been said yet 8-)

          Comment


          • #20
            Re: Volumetric Bezzera BZ07 DE Update

            Okay, If its something the retailer couldnt get right, and you couldnt get right, How is it the retailers fault?
            It sounds like you believe it to be a manufacturing defect, yet I dont see you bitch about Bezzera, Just Jetblack. Which seems somewhat uncalled for as they didnt make the machine, or force you to buy it

            I dunno, I feel that every machine has its quirks, and that it takes time to get to know them, Some take longer then others. I dont know how long you had the machine in question, but it didnt sound like you gave it all that much of a chance to redeem itself as you learned its quirks. As for the Volumetric button issue? Well, These things have a manual switch for a reason. (says the man who prefers to keep one eye on the timer, one on the pour, and the switch is ready to be turned off)

            (edit)
            Sorry Iaindb, I didnt see your post before I hit send...

            Additional, I did not see any of the other posts regarding the OPs problems with his machine. I only saw this one. I still think the OP was a little unreasonable to blame the Retailer for what appears to be a defect with the machine. But he does have a right to vent about his experiences.

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            • #21
              Re: Volumetric Bezzera BZ07 DE Update

              Its not a machine defect, its just a design flaw in some (or all?) volumetric, vibration pump machines. It would have been smart to put the opv before the flowmeter, but this would have required re-engineering (money).

              But really, volumetric single group machines are a bit nonsensical anyway.

              Comment


              • #22
                Re: Volumetric Bezzera BZ07 DE Update

                Originally posted by 56726878737A1B0 link=1320467172/20#20 date=1320548166
                Its not a machine defect, its just a design flaw in some (or all?) volumetric, vibration pump machines.
                I would agree that differing volumes of water for different puck pressures would seem a design flaw, but how is it not a defect to get _different_ amounts of water out of the same volumetric button when theres no coffee in the basket?

                Not taking any sides, just wondering...

                Comment


                • #23
                  Re: Volumetric Bezzera BZ07 DE Update

                  Originally posted by 656D6562686E0C0 link=1320467172/21#21 date=1320577623
                  Originally posted by 56726878737A1B0 link=1320467172/20#20 date=1320548166
                  Its not a machine defect, its just a design flaw in some (or all?) volumetric, vibration pump machines.
                  I would agree that differing volumes of water for different puck pressures would seem a design flaw, but how is it not a defect to get _different_ amounts of water out of the same volumetric button when theres no coffee in the basket?

                  Not taking any sides, just wondering...
                  Oh maybe i didnt read the thread properly... is that what the OP is saying?

                  Comment


                  • #24
                    Re: Volumetric Bezzera BZ07 DE Update

                    Originally posted by 64405A4A4148290 link=1320467172/22#22 date=1320614190
                    is that what the OP is saying?
                    I think so, but not only in this thread - I happened to read his other thread and got it from there...

                    Comment


                    • #25
                      Re: Volumetric Bezzera BZ07 DE Update

                      It could be something simple like a faulty flow meter

                      Anyway Marty now has a kick a** Gea
                      Many happy coffees await

                      KK

                      Comment


                      • #26
                        Re: Volumetric Bezzera BZ07 DE Update

                        hey everyone..
                        the BZ07 is behind me and as KK put it, I do have a kick a** Gea and i love it..its a steaming beast
                        I dont know about you guys but i go thru 1kg of beans a week.

                        Comment


                        • #27
                          Re: Volumetric Bezzera BZ07 DE Update

                          Originally posted by 4D415254591716200 link=1320467172/25#25 date=1320635794
                          the BZ07 is behind me and as KK put it, I do have a kick a** Gea and i love it..its a steaming beast
                          many happy coffees for you and your guests!

                          1kg of beans a week


                          sounds like youre addicted to methylxanthines like me... do you like chocolate?

                          Comment


                          • #28
                            Re: Volumetric Bezzera BZ07 DE Update

                            i do like chocolate. who doesnt

                            is 1 kg a lot you reckon? am i an addict? lol

                            Comment


                            • #29
                              Re: Volumetric Bezzera BZ07 DE Update

                              Originally posted by 64687B7D703E3F090 link=1320467172/27#27 date=1320636400
                              who doesnt
                              some people, apparently. I dont understand them. My mother-in-law included (cant stand the stuff)

                              Originally posted by 64687B7D703E3F090 link=1320467172/27#27 date=1320636400
                              is 1 kg a lot you reckon? am i an addict? lol
                              for my last workplace of 30 people, no about 1kg a week was normal. For an individual or small family? Do your feet touch the ground when you walk?!

                              Comment


                              • #30
                                Re: Volumetric Bezzera BZ07 DE Update

                                Originally posted by 6C607375783637010 link=1320467172/25#25 date=1320635794
                                i go thru 1kg of beans a week.

                                that explains a lot actually ;D

                                Comment

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