Most La Pavoni home levers have the pressure relief valve but no anti-vac so at startup you need to release some steam to get up to the correct temperature and after turning it off the lever is sometimes "sucked" upwards by the under-pressure in the boiler.
La Pavoni puts more modern valves on their new models. These have two-in-one: it's a pressure relief valve that opens when a maximum pressure is reached, to avoid breakage, it releases some steam during warm up and it allows air to get sucked back into the boiler when cooling down.
A fine reason to go visit Peter van der Weerd in his www.kafko.nl workshop, and enjoy his company, chatting about things related to coffee machinery, life, family, pleasure... and coffee.
Peter van der Weerd upgraded my old La Pavoni Pro with this new valve and in the process he did a check up of the machine, replacing a rubber seal in the boiler cap and also replacing the heating element which had suffered some overheating in the past and turned out to have less than "infinite" electric resistance which might cause a shock someday.
Taking off the old pressure relief valve
Steam wand & old pressure relief valve off
Taking a look at the bolt inside the boiler
Taking off the pressure gauge
Preparing to take off the heating element
Looking from the open bottom up to the bolt of the oldvalve
Taking off the old valve
getting the new valve ready
Inside of the new valve, check the anti-vac
close up of anti vac
Holding the bolt to fasten the new valve
Sliding on the new valve combination
Fastening
New element in, connecting the copper tube to the OPV
Delicious cup: all the work was well invested! At the end of the previous blog about the pressostat and PID working together , I mentioned that I would like to clean up the xmas tree of wires and have as few cables and probes as possible to visually disturb the classic design of the La Pavoni. Getting rid of the probe that was fastened with copper tape to the top of the brew group was a priority. I wanted to hide a new probe in the cooling fin as close as possible to the brew group. This morning I asked Tije if he could do that. He would need to drill a straight hole of 3mm diameter in the 4mm inner ring of the cooling fin that sits as a tight clamp around the brew group. Always the optimist, Tije set to work: First, Tije made a piece of aluminum to fit the inside of the ring. Drilling a thin hole straight through the curved aluminum, if possible tangentially going through the inside of the ring to touch the brew head directly, you need the support of the temporary insid...
Despite selling one and giving away two of the five monster vintage 'boat anchor' receivers that I had, I still enjoy listening to shartwave radio. The modern iCOM R8600 that I also have has a wider range plus some decoding options but it's not easy to figure out what encoding is used on which frequencies. The SDR-Control app from Marcus Roskosch at https://ham-radio-apps.com/ makes this much easier and also allows some remote control of the receiver so you can place it and an antenna at the top floor of your house while listening downstairs. I also got the SDRplay RSP1B box: This offers a great listening experience at a very low price compared to the iCOM hardware. I had one before and bought one again after a (somewhat limited) Mac version of the software became available. This device needs a computer to be connected to the receiver. For some time now a nifty little device has appeared which not only works standalone, it even allows you or anyone else to utilize the ...
(also see Daily Coffee News feature ) Tije designed and made the following structure for a tiny and cheap fluid bed roaster, to which Jan van der Weel added the Arduino parts, electronics and programming: Sketch by Tije de Jong Jan sourced a very cheap blower (€ 11) to start with, Tije developed and constructed the mechanics, Jan built together and programmed the TC4 / SSR electronics. On his blog, Jan will specify exactly how the TC4 part is combined and programmed and I will copy these details into this blog entry, just as Jan will use this video in his blog. We did a few test roasts to make sure it works at all and it does. Towards the end, the first roast tended to get a flat BT line and airflow was slightly decreased. 200g seems max load of green beans. Second roast a little more power was given to the heater. Next we will try the Background Roast driven by the PID software of Artisan. A week later, with updated software that works better to change the...
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