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Thread: Greg Pullman's portafilter pressure gauge on the road

  1. #101
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    Paid, please add me to the list & thanks for providing such a handy service!

  2. #102
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    Quote Originally Posted by voicecoils View Post
    Paid, please add me to the list & thanks for providing such a handy service!
    Gauge received, thanks to the last user who sent it nicely packaged and with tracking. Tested it today and it's showing my V2 Silvia at 10-11 bar which is about what I expected having read they were typically set high. Will pickup a OPV teflon gasket next week which is made to drop the pressure to ~9bar, test and send on to the next person or back to Greg if all goes well.
    Last edited by Javaphile; 12th September 2015 at 04:22 PM. Reason: Remove unneeded/bad code

  3. #103
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    Gauge is with me in Sydney now. Anyone else want it next?

    Turned out my Silvia has an adjustable OPV so no washer needed. Much force was needed to crack open the locking nut but once loosened I was able to drop pressure down to 9 bar on the gauge. I did find the needle valve in the pressure gauge setup a little tricky to calibrate & get the flow rate to repeatably drip at 1mL/sec. I was also surprised that pressure didn't seem to change dramatically with the flow rate too low (~0.5mL/sec) or too high (~1.5mL/sec) while I was trying to dial in the flow rate.

  4. #104
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    Hi guys,

    Just paid my dues to Greg's account so add me to the list. I did this last year but have moved my Silvia to a new homeand cleaned her and can't pull a good coffee since. I've tried everything but a check of the pressure will confirm all is OK. It's such an easy test that it's orth the money. Cheers...

    Zarbs

  5. #105
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    Quote Originally Posted by voicecoils View Post
    Gauge is with me in Sydney now. Anyone else want it next?
    Gauge is back with Greg the OP. I sent it back to him a few weeks ago after the thread here went a bit quiet.

    Great tool, I recommend taking a turn trying it out!

  6. #106
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    Rechecked my pressure and had to tweak the bleed and then make a fine adjustment to my valve. All fine again now. I can recommend this setup for testing your pour pressures. Gauge is back with Greg now if you want to partake of this great service. Cheers...

  7. #107
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    Just paid Greg for the hire of the Portafilter.

  8. #108
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    Just sent the money through for the gauge hire.

  9. #109
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    Does anyone want the gauge or shall I send it back to Greg?

  10. #110
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    Gauge is coming back to me now, feel free to post in the thread when you want it next.
    Beanz. likes this.

  11. #111
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    Quote Originally Posted by gregpullman View Post
    Gauge is coming back to me now, feel free to post in the thread when you want it next.
    I'm back with a new (for me!) coffee machine so I've sent payment to borrow the gauge again.

    Cheers!

  12. #112
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    Paid, please add me to the list. I'm trying the 6 bar approach promoted by Matt Perger. I want to see whether the pressure set at the rotary pump corresponds to the pressure at the portafilter. I have a Vibiemme Replica single group. Many thanks.

  13. #113
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    Paid - please add me to the list. I want to check whether my Breville Oracle pump is working as it should (I suspect it is not putting out enough pressure)

  14. #114
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    Quote Originally Posted by JohnF View Post
    Paid - please add me to the list. I want to check whether my Breville Oracle pump is working as it should (I suspect it is not putting out enough pressure)
    Do the Group Handles of the Oracle use the standard 3/8" BSP thread John?
    Otherwise, the Gauge may not be able to fit directly; an intermediate thread adapter may have to be sourced before the Gauge gets to you...

    Mal.

  15. #115
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    Quote Originally Posted by JohnF View Post
    Paid - please add me to the list. I want to check whether my Breville Oracle pump is working as it should (I suspect it is not putting out enough pressure)
    Hi John, I don't believe the portafilter pressure gauge will fit on your Breville. And you can't remove the spouts under the Breville portafilter to directly connect the pressure gauge to the Breville.

    I'm testing the pressure on a Vibiemme Replica. I also have a Breville BES920, so I'll check whether the portafilter pressure gauge fits this machine

  16. #116
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    Good point - might have to buy a second group handle (I was considering having two anyway, as we use it in an office).

  17. #117
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    Hi John I'm ready to send the pressure gauge. However, you'll need a portafilter that uses the standard 3/8" BSP thread. I don't believe you can get one for the BES920.

    So do you want me to ship the pressure gauge to you?

    Cheers, David

  18. #118
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    According to this WLL vid on youtube, the gauge should read 10bar to get 9bar at the grouphead as the excess 1 bar will be diverted to the reservoir? happy to be corrected if I misunderstood. getting a porta filter gauge myself to adjust the pressure on my BFC junior.

    https://www.youtube.com/watch?v=torXYzDE2y0

  19. #119
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    Quote Originally Posted by symphonie View Post
    According to this WLL vid on youtube, the gauge should read 10bar to get 9bar at the grouphead as the excess 1 bar will be diverted to the reservoir? happy to be corrected if I misunderstood. getting a porta filter gauge myself to adjust the pressure on my BFC junior.

    https://www.youtube.com/watch?v=torXYzDE2y0
    Completely wrong, sorry. The pressure at the gauge will be equal to atmospheric pressure (0 barg) plus the pressure drop across the valve (usually adjusted to 9 bar). The pressure at the pump discharge will be the pressure at the gauge plus the pressure drop between the gauge and the pump ; which may be 1 bar, in some circumstances (which would result in 10 barg at the pump discharge).

    Pressure can't be diverted elsewhere (but flow can).
    Dimal and symphonie like this.

  20. #120
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    Quote Originally Posted by MrJack View Post
    Completely wrong, sorry. The pressure at the gauge will be equal to atmospheric pressure (0 barg) plus the pressure drop across the valve (usually adjusted to 9 bar). The pressure at the pump discharge will be the pressure at the gauge plus the pressure drop between the gauge and the pump ; which may be 1 bar, in some circumstances (which would result in 10 barg at the pump discharge).

    Pressure can't be diverted elsewhere (but flow can).
    Thanks, If I use a portafilter gauge should it read exactly 9 bar to get the ideal brewing pressure?

  21. #121
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    Quote Originally Posted by symphonie View Post
    Thanks, If I use a portafilter gauge should it read exactly 9 bar to get the ideal brewing pressure?
    Just saw the video. You didn't misinterpret it (it's just wrong).

    9 bar at the group is a guide only - the pressure will vary during an espresso pour, as the resistance and flowrate change.

    Greg Pullman's portafilter attemps to replicate flowing conditions, so that there is some pressure drop in between the OPV and the group.

    It is a better approximation of real conditions than a blind, but you are effectively calibrating the OPV/pump gauge for a single flowrate.

  22. #122
    Mal Dimal's Avatar
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    but you are effectively calibrating the OPV/pump gauge for a single flowrate.
    But, isn't that the intention?
    Identify a median flowrate and then adjust the OPV/Pump Bypass Valve to achieve this at the Group?

    Mal.

  23. #123
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    Yep.

    All I'm saying is that it won't maintain 9 barg at all flowrates - so there isn't really _an_ ideal brew pressure.
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  24. #124
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    Does that mean that everything revolves around how well the coffee puck in the filter basket is prepared that will determine the actual brew pressure and flow rate?
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  25. #125
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    Yep, it sure does...

    And with machines that lack an OPV or a Spring Lever machine, etc it's even more important...

    Mal.

  26. #126
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    I remember the advice given to me by the guy I bought my naked portafilter for my Gaggia Classic from. "If you do not like how the shot you pulled turns out, just do it again. Don't change the dose or the grind setting. There is a high chance it is just your fault." Best advice I got when I was a newbie to the world of home made espresso.
    Dimal and trentski like this.

  27. #127
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    Is this still doing the rounds?

  28. #128
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    Hi @Janus,

    Yep as long as someone needs it it's still available. Just follow the instructions in the first post and I'll send it out to you.

    Cheers,
    Greg
    matth3wh likes this.

  29. #129
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    Paid up, please add me to the queue.

  30. #130
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    Thanks Janus... if anyone else wants to use the gauge please check the instructions at the start of the thread. Janus should have it around the end of this week so I'd imagine it'll be available mid-September-ish.

    Greg
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  31. #131
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    Greg Pullman's portafilter pressure gauge on the road

    Whoops figured it out.
    Last edited by Janus; 5th September 2017 at 09:38 PM.

  32. #132
    Senior Member matth3wh's Avatar
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    Thinking about joining the queue. I know MB21 was also considering it.

  33. #133
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    Righto, I've paid up... add me to the queue. I've sent a message to Janus.

    Matt

  34. #134
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    As matt said I'm keen just not ready yet

  35. #135
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    I've sent payment tonight so when Matt is finished (no hurry) i'll get the gauge when Matt is finished.
    matth3wh likes this.

  36. #136
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    Behmor Brazen - $249 - Free Freight
    Please add me on the list, all paid up.

    Thanks Rob

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