Even if the metered orifice (it isn't really a valve) between ports 2 & 3 in your intake manifold is miraculously not clogged up after 500K km, there remains the fact that there's madness in the method:
"... To lower costs, some manufacturers substitute a restrictor for the PCV valve. This uses an orifice and a small reservoir to perform some of the functions previously handled by the PCV valve. A small hole allows enough vacuum to draw fumes from the engine, but not enough to cause a rough idle. The orifice may become clogged in time and need replacement ..."
http://www.agcoauto.com/content/news/p2_articleid/197
Now to complete the merry situation, add a working EGR valve dumping exhaust crap inside the intake manifold ... 
If the metered orifice gets clogged up, the post throttle PCV line gets blocked, the intake manifold no longer pulls any vacuum from the crankcase, crankcase pressure increases, piston ring sealing decreases, blow-by increases causing even more crankcase pressure, and engine runs like a pig and burns more oil.
Even an unobstructed metered orifice is IMHO substandard, for as it's by definition of a fixed size and flow capacity (not variable as in a PCV valve), and it has to be of small diameter not to cause a rough idle, it can't flow enough at engine rpms above idle, say at half throttle.
So yes, my veredict is that the metered orifice is guilty as charged. 
Congrats on the nice looks of your engine's innards after 500K km Patricks, it screams quality oil changed at short regular intervals. 
Next time some 'expert' calls me crazy for changing oil at 10K km intervals ("what a waste! Don't you know today's oils can last for 50K km?" 
) I'm gonna stamp your pics in his face.
