Abundant black smoke by accelerating

First of all good. Well, my problem is the next one Mercedes Year 99 Class C220, by accelerating (from 3,000 revolutions) throws an impressive amount of black smoke, we are not going to see.
The EGR and purchased that works properly, thrown away admission cleaner, injection cleaner and performing the successive maneuvers of accelerating it and hurrying it and 4 and 4, nothing is still noticed.
The diagnosis indicates a pressure discharge valve failure, and this new, some sleeve may be broken, are also exaustively reviewed, I don't know if it would be injection failure.

Let's see you have changed filters, you have proven cylinder compression, it may be burning motor oil, use the cylinder to cylinder and you have to give you more or less the same compression. You will tell me