tompoland It answers what I asked nicely matey, but leads to a second question. What happens to the water already in the puck? Does the flow stop and the puck just absorb what is in it, or does it continue to ‘drip’ for a little bit. In other words the effect of the paddle is purely on water lying on top?
On the Evo, I prefer to kill the shot based on extracted weight. This means that the bar pressure might be between 5 and 7. If i attend to my milk or top it up with water, then the pressure has dropped to around 2 which is the safe point to which to disengage. Sometimes I have a bit of a sloppy puck, sometimes nice and dry. I guess if I paid more attention to shot prep it would be dry every time. That said, if I leave it another few seconds it always is dry. But, he says, I am using an IMS basket (forgotten which one now). If I use the standard basket the headroom is absolutely enormous with a deep pool of water!
Nurri Leva S.A.
Maybe I’m missing something, but isn’t this pretty much exactly the same as you get from the three way valve on a non lever machine, it just opens a path from the group head to the tray, to allow the pressure and excess water somewhere to go. Obviously this is novel for a lever, but in terms of what it does is pretty standard.
Shot should stop fairly quickly (as there’s no pressure and the puck gives a lot of resistance). If the basket was fairly full of coffee it should be dry. If there was a lot of headspace then there’ll probably be some water and a sloppy puck.
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dfk41 Does the flow stop and the puck just absorb what is in it, or does it continue to ‘drip’ for a little bit
I activate the paddle about 5g before my target. So if I’m going for 36g then I nudge the paddle at 31g and a few seconds later The pour stops.. Barely any drips, of any, after that.
Next day update to the above: paid more action this time. Definitely a wet puck. I prefer a dry puck but I guess I’m reting to make my preferred espresso, not my preffered puck. So I can live with that. The groupmhead keeps dripping for a minute or two after the pressure has been released with the left paddle. I think Mt workfow will become:
a. End pour with left paddle.
b. Remove cup at 36g and replace with Sponge (this is what I do with the other espresso machines)
c. Leave portafilter in to dry a bit (a la DavecUKs tip) and let the drips get soaked up with the sponge so the drip tray stays clean (yes My wife has already told me: OCD).
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hornbyben definitely novel for a lever. Sounds pretty similar to my machine
Only difference from a pump machine is that the three way valve is always open to the environment (therefore the pressure is equal) unless it’s brewing. With the lever, it’s always closed (so the water can stay in the group and pressurise) presumably one of the reasons you have to hold the paddle to drain it out until all the water is out - because, if you release the paddle, the valve shuts again.
My understanding from watching the videos at least (but I might be wrong!)
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Do kees van der westen slim jim irocompresso machines use paddles on the grouphead itself or do they use buttons or some other control interface mounted on the console ? This is because the particular solution may be patentable even if otherwise have found different solutions to the same technical problem.
Backflushing is as per pump machines but I’m not sure if it is eveb necessary. The water that ia always flushed into the drip tray when the left paddle is activated is always clear.
I wasn’t told thus by anyone but from observation i believe what is flushed is the water that is in the grouphead chamber above the screen as the waste water from left paddle operation is always clear. If so then any water between the screen and the puck will not be vented and that’s probably why the puck isn’t dry when the left paddle is used. On the other hand this means operating the left paddle shouldn’t foul the internals wirh coffee powder.
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From recollection, operating the left paddle causes the puck to be a ittle more than the level of sogginess that I always get with my e61 when I stop the shot. It may be following the lead of pump machines’ solenoid valve, but the fact is that until the idrocompresso and the nurri came along, levers simply never had this ability…so this is innovation that moves the state of the art forward…
What you surmised is indeed correct!
The kvw is a push button
They also made and auto back flush mode for it.
Decent De1pro v1.45 - Niche Duo - Niche Zero - Decent is the best machine ever made -
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For me, rhe nurri paddles on the grouphead are a distinctively different technical solution than the push buttons on the console from the perspective of user feel and rhe fact that it is mechanical in nature as opposed to computer controlled.
Just like the solenoid three way valve for the pump machines, no burn steam wands, and dedicated single dosing grinders, such innovations make the work flow more elegant, easy, enjoyable, safer, convenient and consume less energy on tbe part of the user. I suspect that such solutions like that will become more common in future levers and become part of the expected industry standard that will be expected of any decent ptrmium lever machine. This is all good for the consumers because innovation in the lever market has been ossified for too long a time and some manufacturers are contentto offer old tech levers that have barely advanced since the 60s at high prices. Now things are finally changing for the better in a big way for the home marker with the advent of the leva x, vesuvius evo, nurri leva and vostok.
chlorox rhe nurri paddles on the grouphead are a distinctively different technical solution than the push buttons on the console from the perspective of user feel and rhe fact that it is mechanical in nature as opposed to computer controlled
How ‘mechanical’ is the end-shot paddle? I mean: does it actually open a valve with a mechanical link, or does it activate a solenoid through a microswitch? I’m just curious. Totally agree with you on the feeling - it’s (in my view) a bit like the difference between a CD and a memory stick. Both may contain exactly the same music, but I prefer the CD 🦖.
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Sorry, by mechanical, I don’t mean to suggest the left paddle directly and physicallypulls open the valve. I don’t know how it actually operates within tbe grouphead to open the valve. What I meant to say can be more accurately said as it appears and feels as if it is a mechanical means of operation because tbe paddle is physically conndcted to an assembly or structure, moving the paddle mechanically moves that assembly and as the assembly moves physically forward, something which can be heard to click open. This is true regardless of whether the machine is powered on or not, the same click is produced. This is as opposed to just pressing a button on the console of the body of the machine which feels completely physically disconnected from qhatvthe grouphead is doing.
chlorox I don’t mean to suggest the left paddle directly and physically pulls open the valve
I didn’t think you meant it! I am just curious to understand how it’s done; I can think of how to do it with effectively a 3-way solenoid, but I don’t know if that’s how it’s done on the Nurri.
And I totally understand what you mean re mechanical connection/disconnection - that’s why I was giving the analogy of a CD vs. a memory stick, rather than mentioning vinyl. Ultimately, it’s the same string of bits that is going through a very electronic DAC process; a vinyl record is a totally analogue process, from movement of the needle in the groove to a speaker diaphragm moving at the same frequency. But the CD still has a certain amount of ‘physical feeling’ - you need to take the disc in hand, put it into a reader and close a door. Not just click on an icon.
chlorox don’t know how it actually operates within tbe grouphead to open the valve
You can - if you can be bothered for the sake of scientific and accurate information:
- pull a shot as normal;
- when the shot is finishing, turn the machine off.
- try releasing the pressure in the group by means of activating the paddle as usual: if it works it’s purely mechanical. If it doesn’t, it’s likely to be via a micro switch and solenoid valve.
- let the group depressurise and, after that, turn the machine back on again.
Yes that’s a very apt way of putting it!