Larger 4th valve


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Posted by Volker on September 28, 2002 at 02:46:27:

I have to identify a 5/4 BBb rotary (having no brand name engraving on the bell). Some small stamps like D.R.P. (=Deutsches Reichs-Patent) and the 19mm bore could relate it to the Markneukirchen area. It looks similar to a Cerveny Kaiser. I found the 4th valve to be larger than the other 3. Does anyone know, what manufacturer provided the ususal 4 rotary valves in a line, but the 4th in 5mm larger diameter (and why)? Thanks in advance for helping.


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