DIN insert for DIN/Yoke valve

[kwinter]

The tank has 3442 stamped on the neck area

He didn't ask about the tank. He asked about the valve. Two completely different pieces of equipment. But it shouldn't matter whether the valve is 300 bar or 200 bar as far as getting the donut to start screwing in. There can't be any different thread in the valve. It has to be DIN, and that's the same all over the world. But you might be trying to screw it in backwards. There is an o-ring on both sides, but they are different sizes. Try turning the donut over and screwing it in.

 

[redacted]

He didn't ask about the tank. He asked about the valve. Two completely different pieces of equipment. But it shouldn't matter whether the valve is 300 bar or 200 bar as far as getting the donut to start screwing in. There can't be any different thread in the valve. It has to be DIN, and that's the same all over the world. But you might be trying to screw it in backwards. There is an o-ring on both sides, but they are different sizes. Try turning the donut over and screwing it in.

The side with the protrusion goes in.

 

[spectrum]

DIN is DIN as far as thread goes. Anything else would be beyond obscure.

200 and 300 BAR as mentioned denote the 5 or 7 threads. The key point being 3500+ for the 7 thread version. The 200 moniker is misleading since it applies to any cylinder rated below 3500 PSI, hence it's the base configuration used in the 3442 convertible valves that are conveniently just under 3500 PSI.

If you have DIN to Yoke plug that won't fit in 2 things come to mind....

1) Your valve threads are very crusty. Try vinegar & a toothbrush then rinse well.

2) Your valve has been squished in a vice or wrench and ruined. Will a DIN regulator or fill whip work in the valve?

Pete