There are many methods of equalizing the pressure in your ears, some of them, Beance Tubaire Voluntaire (BTV) or Voluntary Tubal Opening is an example, are hands free.
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I have a purge valve that is NOT on the nose piece. It's located at the bottom of the left lens, so, no interference with nose. I got it just for the reasons you indicate - so it doesn't get in the way.
Andrew VA once bubbled...
I've used masks of both varieties and due to my mustache I've preferred the purge-valve model, although I can attest to the nose rubbing the plastic. This only occurs when my reg decides to go buoyant and pushes my mask up a tad.
I rarely have difficulties equalizing without pinching the nose but I could see where a purge valve could be a problem.
In terms of it being a potential point of failure, I've logged dozens of dives while using a purge valve and the worst thing I've ever had happen was a grain of sand becoming lodged in the valve. A little annoying, but not something that could've ended a dive.
I suppose when it really comes down to it you have to weigh adding another point of failure for the luxury of effortless mask clearing. If you only occasionally need to clear your mask I wouldn't bother with the purge valve.
tingkka once bubbled...
in regards to failure point, you have experienced it with the grain of sand. imagine those people who rarely take care of t heir equipments, those who just toss them in their bag and would wash it 4 months later when it starts stinking up the garage. their valve will have crystalized salt and detilerating silicone valve that will no longer function correctly. you may replace the valve, however. But that requires effort in doing so; driving to the store, buying the valve, getting the old valve off, putting the new valve on (and it's not that easy), then hoping it works by testing it out in pool. i mean...i may be wrong...but this is just point view on purge mask. it all depends on people.