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This Tuba Tuesday the Museum features a euphonium which also features the 1873 patented feature of Cerveny instruments, their Walzenventile, or “roller valves”.  This roller valve mechanism is basically rotary valves that have been rotated 90 degrees from their typical position.  This was done to simplify the mechanism, by increasing the mechanical advantage of the lever system.  The 1873 patent also covered the spring tension adjusting screws, seen in this example as well.  This mechanism was an extra cost option on their higher grades of instruments.
This Cerveny roller-valved horn exhibits the much less ornate seal used in the home market.  Contrast this with the ornate seal applied by the Chicago distributor, and shown on the BBb tuba #09314 in the special collection.  Additionally, this was not the highest grade of decoration, as compared to the beautifully engraved valve mechanism of the BBb tuba #09314.



https://simonettitubacollection.com/ins ... -rotary-2/

For those as wish to compare the various elements mentioned in the description, here are the links...

BBb tuba #09314

Seal

Valve Mechanism

(I don't know if it is a good thing or a bad thing to assume everyone is as lazy as i am...)

Anyway, must remember "Walzenventile" and as hithertofore i just called 'em side-roters (and no one probably understood what i meant).

Oh, the first instrument in the collection also has 'em.