Honestly, it's no necessity. My model 540 something, by then, there was no safety valve.Is the safety valve of any help?
I'm VASing over a complete Verdamper set, but I don't understand if it's better to get the safety valve version or not.
Do you get "vacuum" when inhaling from the Verdamper? So that lifting the safety valve acts as clearing the carb hole on an old acrylic bong?
This is unlikely since it seems to me the top of the heating element glass part is hollow on the top, but if the safety valve would help in order not to lift the heating element it could be a wiser choice. But in the end, perhaps it's still better to lift the heating element and place it on its spot on the wooden "transformator" holder?
Im sure what happened at some point, probably in a Dutch coffee shop, some dopey tourist plumbs, you know the sort, in the overwhelming confusion of the moment, get it backwards and with the consciousness of an ameba, blow into the inhalation tube when they are supposed to suck- sending water up through the herb chamber into the heater.
The safety valve was added primarily for this reason. Picture Evert on guard, better protected against these dumbass vape know nothings who can't exercise the witt to simply inhale in a controlled manner, his fingers on the safety valve like a highnoon shootout, ready to pull that glass stopper out the first sign of a blowing muppet.
That's what it's for. I used mine 6 years, no valve, no issues there, just I made sure everybody who used it had the awareness about them to simply suck and don't blow.
But as @Noah0608 points out, the safety valve can effectively be a carb hole to clear your hit, rather than lifting the heater (which itself is very easy at any point), or leaving the tube full of vapor for hit after hit.
This is not a paramount feature though. The Verdamper was never designed to be cleared after every hit. I never used to do that. There's no blowback issues, it just gets full of dense milk, hit after hit, without needing to lift the heater or clear the chamber of vapor until you've had enough or stir.
So the valve is less necessary, as a carb hole, than usual, but would offer a non heater lifting way of clearing the vapor.
So it's up to you. Indeed theres no vacuum as such, with such a wide open heater, and you really don't even want to clear the chamber after every one or two hits, IMO, because that isn't what the Verdamper is about. It's like getting up to 60, dropping back to zero every time.
The Verdamper is designed to stay at 60, rev after rev, until you want to ease off the pace.
I would probably go for the safety valve myself if I was shopping now. Just for the perk and added flexibility.