Thermo "Pro" Din/K Valve Water Retention

[60south]

I have been told that this kind of valve needs to be specially cleared of water before you fill the tank.

As it was shown to me, you do this by partially plugging the outlet with your hand, open the valve, and small amounts of water will spray out a tiny hole on the side. And indeed, that is what appears to happen. Well hey, look at that!

Apparently if you don't do this, the water "ends up inside the tank". Huh?

I am failing to visualize how this works. How can some back pressure with your fingers clear the valve of water, while attaching a HP whip would not? I'm confused. Anybody have more info about this? Valve diagrams? Wild guesses?

And "water retention" is not a reference to my valves gaining weight (I thought I'd just nip that joke before the thread gets hijacked).

Edit: I'm using the valves with the yoke insert, not DIN, if it matters.

[wallyc72]

All you have to do to get the water out is open the valve slightly before you hook it up to the fill whip. This should be done on EVERY tank before filling...

[60south]

All you have to do to get the water out is open the valve slightly before you hook it up to the fill whip. This should be done on EVERY tank before filling...

Of course. But on this particular type of valve that technique is apparently insufficient.

Maybe the small hole is a water drain for the gap between the DIN threads and yoke insert(?). Thus applying back pressure with your hand forces air into the DIN threads and clears them of water.

But I don't get how that "thread" water, if that's what it is, could potentially end up inside the tank if you're using a yoke whip to fill it. Can anybody confirm/deny this?

[CaptnJack]

just blow out the valve like any other. there are 2 orings on the din insert one on the inside, another on the out. the inner one keeps the "thread water" from going into the tank

[scottsax]

Edit: I'm using the valves with the yoke insert, not DIN, if it matters.

Does this matter? I use mine as DIN-should I be blowing them out before I take them in to be filled? Or will any decent shop employee know to do that?

[Romer Treece]

Edit: I'm using the valves with the yoke insert, not DIN, if it matters.

Does this matter? I use mine as DIN-should I be blowing them out before I take them in to be filled? Or will any decent shop employee know to do that?

I'd say 97% of tank fillers don't do this. Do it yourself EVERY time!