Jack, your post reminded me of Bob's post. I know he wants me to correct him but I just haven't had time. Now you bump the thread! Here is my correction...
BobBrews wrote:All!
So after reading this I took my ball valve apart. I found some of the plastic thread tape (that you use to make a tight seal) in there but not much else. No nose snot! I reassembled it and now I am good for another 5 years. It was a good exercise (like when I had to disassemble and reassemble my rifle in the Army) but now I know that using a ball valve is safe and recommended by those like myself that use them every fortnight.
I might buy a couple of extras and use them for prizes for Cheesestradamus?

You idiot Bob

.
More seriously though, Bob's ball-valve is proof that a ball-valve can be fine but it is not proof that it will always be fine. Bob, when you recommend ball-valves, you must also let fellow readers know the stuff you know. You might think they know it but most won't (see end). For instance...
1. Each ball-valve/kettle set-up is different. (Some get exposed to intense heat and others to just a bit of warmth (especially 'keg' kettles). Regardless, most ball-valves will not reach a sterilisation temperature during a boil.
2. A ball-valve is a ball inside a cylinder. This means that there is always a volume of liquid 'trapped' in the chamber whether it is open or closed unless it is pulled apart and dried. Opening the tap once does almost nothing to change the liquid content of what is trapped in the chamber. Frequent turning on and off the tap will flush the chamber eventually.
3. Other factors come into play. For example, boiling plain water in the kettle at the end of the boil and then flushing that through the tap (opening and closing it several times) will make a difference.
There are many scenarios here and all that have a good outcome usually require a lot of work (whether that be in heat and/or time and/or manual labour) compared to a syphon. Personally I'd prefer spending two minutes setting my syphon up right and another two minutes cleaning it than boiling water (about 4 litres) and running it through my ball-valve, opening and closing the valve and then mixing up 4 L of sanitiser and doing the same thing.
Ball-valves are only safe if you make them so and check that they are so. Remember, Bob's experience above is rare. Most other people's taps do stink etc when opened. Bob also is not lazy in his cleaning and sanitisation so it would be good to hear his exact regime here and see a pic of set-p and burner. Be nice to eventually narrow down what are the fastest, safest ways to maintain a ball=valve.
....
The biggest problem Bob...
No, it's not you

. The biggest problem is that in this game, everyone enters it with almost no quality education. Many brewers with a ball-valve (same as a fermentor tap) just think that it opens and closes and to clean it or sanitise it,you only need to open it or close it once, if at all... I mean, it get's hot right?
I've read your posts on what you do with your ball-valve. You might think that is common sense but newbies would not know that you have to do what you do - which is more than a little flushing.
Let us know what you do and if you think any of my reasoning above is incorrect

.
PP
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