DiverHowie
Registered
It's nonsense to criticise purge valves for diving masks. They actually create a superior, more easily used dive mask. I'm not quite sure why they went out of fashion. Perhaps it merely was fashion, perhaps it was imposed by common design practice when low volume masks were first produced and mask manufacturers found it easy to dispose of an added manufacturing cost in the purge at that time, and divers went along with it, liking the low volume design and putting up with their downsides. My diving goes back 45 years, 2500+ dives. My masks were initially purge (a Voit was my first mask). I've had a few more low volume purge valve ones over the years, but they have been hard to find. I NEVER had a problem with a purge valve failure. If I ever would have had one it would have been totally no-big-deal. And of course I have had non purge valve designs over the years. Their perfectly ok, but inferior. For those who criticise purge units as having an extra failure point, I would point out that non-purge valve clearing involves greater task loading and tilt clearing is most often a total (if only short) distraction from monitoring the environment and your equipment. Other things go wrong with masks, the most common one in my experience mask strap failure from slippage (most often caused by poor adjustment design) . Nobody moans over this, though the effect and resolution at depth is much more difficult to deal with than a purge problem. It is discouraging to hear divers who "never tried it" to parrot warnings about purge valve masks. I'd say, if you haven't tried it, don't knock it.