Just downloaded footage from my secret webcam in the kitchen of @"DavecUK"#1 only to discover that he's been holding out on us! Cmon Dave, spill the beans (not the coffee ones) on this geourgeous looking leva. [URL=https://i.imgur.com/Y7e0uuz.jpg][IMG]https://i.imgur.com/Y7e0uuz.jpg[/IMG][/URL]

For this machine it's one of the first made, and I am doing an Engineering review on it for Antonio (the creator) as a favour, so I can't really comment at this stage. But I can post photos….and say that the Paddle levers on this are very basic beta ones….so that area is still in the design melting pot.

needs to be 50mm shorter for a uk work top haha i believe this is a commercial focsed machine?

I love the look of these sorts of lever machines, but they really need to at least try to make them a bit more compact in design. They're either lacking in that area of expertise or they don't care… A more compact design would look like a much better centre piece in a kitchen (and take less space in a commercial setting), rather than protruding till the near edge. The size distracts from the elegance of it.

Certainly a looker. I'm sure we will all look forward to your thoughts when you are able to comment.

@"Cuprajake"#p10000 no it's for the home market

@"Cuprajake"#p10000 from the nurri website https://www.nurri.coffee/portfolio-item/nurri-leva-sa-machine/ L-TYPE LEVA S.A. is a professional machine. Yes. But it is designed for those who want to enjoy quality espresso at home, making it with the same passion and competence of a professional bartender.

@"tompoland"#p10004 I like how they stuck Patent Pending on everything 🤣 a bit unprofessional.

@"Sham"#p10001 I agree when it comes to similar sized Levers that require external plumbing or flojet type arrangement. But the Nurri is dual boiler and plumbing is optional. Still, I agree that it's a lot for a normal kitchen. I like the footprint on the Decent for example.

Powder coated version. Wow. [URL=https://i.imgur.com/7uFzqtw.jpg][IMG]https://i.imgur.com/7uFzqtw.jpg[/IMG][/URL]

@"tompoland"#p10007 In that case they should have either decreased tank sizes and utilised quicker water heating technology (I'm sure there's loads of options from other industry's) or started with a more wide design but I guess that would've cost too much R&D time. One way to think of it is that they won't lose customers if its small, but they will lose customers if its too big. It does look pretty nice though.

Nurri Leva S.A.

hornbyben

tompoland definitely novel for a lever. Sounds pretty similar to my machine, where the pump is stopped (and 3 way valve opened) 1.8g before target.

MediumRoastSteam

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!)

chlorox

MediumRoastSteam

What you surmised is indeed correct!

chlorox

Cuprajake

I don’t know about his experience but I’m dosing 18g with the supplied basket and there’s still room above the puck

chlorox

Cuprajake

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.

chlorox

tompoland

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.

tompoland

chlorox that makes more makes sense. Tx for the clarification.

chlorox

Cuprajake

Yes, the left paddle needs to be pulled for a few seconds. I don’t think ten seconds is necessary though. As I said previously I think backflushing is more of a precaution ras the water that ia vented is always clear.

chlorox

hornbyben

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…

Cuprajake

The kvw is a push button

They also made and auto back flush mode for it.

chlorox

Cuprajake

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.

CoyoteOldMan

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 🦖.

chlorox

CoyoteOldMan

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.

CoyoteOldMan

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.

MediumRoastSteam

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.

chlorox

CoyoteOldMan

Yes that’s a very apt way of putting it!

chlorox

MediumRoastSteam

That’s a good idea. Is there any risk of harming the machine? If not, I’m willing to try it as I’m curious as well how it worke. Does the fsct rhat it makes the same clicking sound when I pull thr paddle even when it is switched off show that it is mechanical?

tompoland

MediumRoastSteam 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.

It doesn’t.

MediumRoastSteam

chlorox - the clicking sound could just be the activating of the micro switch (e.g.: pressing any button with the equipment off). Without owning one it’s hard for me to assess for sure. But it’s my understanding there’s no harm to the machine as the group itself is fully mechanical and the extraction would just carry on as normal.

Even if I do that to my machine (which I did before, by mistake) - a lelit Elizabeth which has the group operated by solenoid valves and all sorts, all it did was to release the pressure from the group as the solenoid became de-energised (normally open).

But maybe someone with more knowledge than me could confirm.

CoyoteOldMan

chlorox I don’t think there is any risk - the ‘worst’ that happens is that the paddle is actually clicking a microswitch, in which case the pressure releases as it has done in all other LSM group machines for 75 years, through the puck. If there is a mechanical valve being operated, then the pressure gets released in exactly the same way whether the machine is on or off.

You just need to remove the cups from under the filter when you switch off, because the tail of the extraction (say under 7 bar) doesn’t taste very nice!

Whether you can be fussed to do it in the name of our curiosity, is a different question altogether!

DavecUK

chlorox It operates microswitch, that electrically activates a pressure release solenoid, connected to the hole the factory made to create the group. It’s usually sealed, but can be opened for a solenoid to be fitted.

The click you are hearing when the machine is off is probably the microswitch. If it’s in fact the solenoid, then be careful when poking around inside the machine as it might not be off, off…when you switch it off. You can tell by switching the machine off at the mains and see if you still get the same click.

MediumRoastSteam

DavecUK - chlorox - looks like there’s no need for the suggested test. Dave confirmed it’s a solenoid operated by micro switch. 👍

chlorox

DavecUK

Thanks for your post Dave.

As I had said earlier, the clicking sound is made when the left paddle is pulled regardless of power being on or off.

I just tried the experiment that mediumroaststeam suggested and switched off the machine while the lever was doing its extraction phase. It did nothing - the lever contained to rise slowly at the same rate and there was no release of the water in the groupheead into the drip tray and there was no clicking sound.

Then when I pulled the left paddle while the machine remained switched off, the clicking sound was heard and the water from the grouphead was vented into the driptray. Thus the operation of the left paddle is not reliant on an electrical power supply at all.

Based on what you explained and suggested, Dave, my experiment seems to show conclusively that the valve is not opened electrically at all unlike the case with a pump machine. Therefore is it reasonable to expect the that it is not in fact operated by an electrical circuit and that it is purely mechanical - which will make it totally different from kees van der westen’s version?

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