Nurri Leva S.A.

tompoland Hi Tom, thank you for sharing. I liked the video very much, the Western music was a nice touch 😀. I am sure you have seen it, but it is ironic (and might be a bit negligent) to have such a technology beast and the coffee coming out to be so thin. I would expect something viscous to come out down the spouts.
I wonder how this machine can be serviced but by a qualified engineer. I doubt they will go for a single group, as most likely not many would go for it, as I suspect it would be cost prohibitive for home use.
It seems the lever trend goes from strong to stronger. Happy days 😀

yeah accident,

so pull the lever down, infuse press wrong paddle/button and vent the group

i too think it will be a vent hole size to allow only so much flow

John_Yossarian

Apparently kees van der westen has announced that they will not be making a single group lever machine of any kind not even of the speedster nor of the idrocompresso. The former was due to the fact that the speedster chassis would tip over if the lever is pulled ansld the latter is evidently due to the very design of rhe idrocompresso itself.

Cuprajake

If the lever is pulled down and water fills the grouphead, this must mean that there is a portwfilter locked in with ground coffee inside to provide the backstop to have that pressurised state. Because otherwise water will just flow straight into the drip tray and the grouphead cannot fill up. If that is the case and if the left paddle is accidentally pulled, then the nurri lever arm will safely rise and the grouphead will vent.

Having said that, I cannot envision a situation where the left paddle can accidentally be pulled. The paddle is quite high up on the groiphead and one’s hand is usually never anywhere near the paddle at any time unless one wants to actuate it. On top of that the action is pulling and not pushing and so that is rvne more difficult to do accidentally or so it appears to me…

Cuprajake

Classic Darwin Award winner.

tompoland

The aesthetics of the slim jim look better than a lot of other lever machines that’s for sure. However I may be nitpicking but it does not seem to be as cohesive design wise as it could have been especially when compared to my favourite KvDW design, the original Speedster with all the embossed circles. This is all subjective of course and it still looks better than most of the espresso machines out there of any type…

It seems to me that the best solution to make levers safe is what LSM did, basically a one-way damper which limits the speed at which the lever can move upwards. This way, whenever pressure is drops quickly in the brew chamber, voluntarily or accidentally, nothing serious happens. I presume LSM has a patent on this idea unfortunately, as implementing it can be done fairly easily using various approaches (yes, this might change the aesthetics slightly and add a few parts, but not that much)

Cuprajake asiest way to check what it does is to choke the lever and press the paddle , any volunteers 🤣

I already answered this in post 111.

Viernes The release paddle was created to end the shot, the possibility to backflush a lever and also vent pressure in case of choking and avoid portafilter sneezing which splashes hot water.

Lever goes back smoothly to the start position.

@Cuprajake

As viernes said, releasing pressure if the machine is choked is precisely one of the reasons why the left paddle solution was invented by nurri.

chlorox I know 🤦😃

Think we’re mixing the conversation, I understand the system, and is use

But I’ve not seen anyone purpose choke a nurri/Vostok and then vent.

As @MediumRoastSteam said we’re looking at the mechanism of the leva returning

As easy you are around the machine doesn’t mean everyone would be, and imagine in a commercial settings where you are mid shot and someone reaches for a cup of the top warmer and hits the paddle, as far fetched as that seems, that’s why they call them accidents.

Any way let’s move one

Can we have some more vids please.

I don’t know how the LSM CLASS system works, but one could imagine a system similar to the dampers on a car. With these, small amplitude movements can happen at fairly high frequencies/fast, but compressing or releasing fully the shocks takes longer due to the dampening effect of oil going through narrow passages and/or valves.

It seems to me that the main danger with spring levers coffee machines is that the lever can swing back very quickly if there is nothing to slow it down, such as a coffee puck. Reducing the maximum release rate would reduce the risk of injuries. I would still make for a messy scene with hot water, coffee grounds or even potentially broken cups in some situations

Eiffel

U r probably right - it may be some kind of hydraulic based system.

I reckon the real need for such a system is in the busy cafe where the baristas may not be as experienced on levers or not fully trained and so the shop owner needs to make sure that a moments inattention does not cost them a damaged jaw and/or broken teeth and his shop a lawsuit! But for the home owner of a spring lever who uses his or her machine every day, I think muscle memory and good work habits should make that highly unlikely. Still, it’s a good reminder for all of us lever users to always be mindful around the uppercut machine! :)