Years ago doing my Nitrox course I had a tank leak when it was turned on. We were in the boat far from a shop. The Nitox instructor opened the valve like you did (I was shocked this could be done pressurized) and he fixed the leak. I always wanted to know how to get in there and do stuff. Thanks for the great video.
Cleaning the pass through shaft/clevis may not be enough if the threads into which the actual shuttle/seat screws are dirty or damaged. Unfortunately, you can't take out the shuttle with the cylinder pressurised, so you have to do this on an empty tank. Generally however, all that sits in those inner threads is old grease, and that can be washed out with the shuttle closed and in place with a suitable spray cleaner, like some isopropyl alcohol or similar. A light regrease and you're good to go. Most of the friction is of course between the pass through shaft/clevis and the housing because this is where the axial pressure load is reacted, hence the PTFE/Nylon washer designed to react that load with the minimum friction.
I would add, when you put the nut back onto the threads with the tool or slotted screwdriver (the final step), that the nut should sit flush with the ends of the threads. Often I see these overtightened, which can be a problem.
Achim, does that spindle come into contact with the gas from the tank? I.e. can you use silicone grease (which works way better for this) or do you have to use christolube if for instance you will ever have 100% O2 (partial pressure blending)?
I serviced my own valve for the first time, before they worked great, I filled the tanks and they become very hard to turn so I take apart everything end put them back without Grease , oxygen grease and they work great 👌
What exactly do you put the lube on? Is that the o-ring and the washer, or something else? That wasn't easy to see on the video. Thanks a lot for the video, it is very helpful!
Dear Achim, If that o-ring has no sealing function and that is just basically a slider, what is sealing behind the HP-seat when the valve is open? Try to do this under pressur with partial open position and regulator is on the valve! The straight thread don't seal perfectly. ;)
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Great video. Theoretically.
Years ago doing my Nitrox course I had a tank leak when it was turned on. We were in the boat far from a shop. The Nitox instructor opened the valve like you did (I was shocked this could be done pressurized) and he fixed the leak. I always wanted to know how to get in there and do stuff. Thanks for the great video.
Cleaning the pass through shaft/clevis may not be enough if the threads into which the actual shuttle/seat screws are dirty or damaged. Unfortunately, you can't take out the shuttle with the cylinder pressurised, so you have to do this on an empty tank. Generally however, all that sits in those inner threads is old grease, and that can be washed out with the shuttle closed and in place with a suitable spray cleaner, like some isopropyl alcohol or similar. A light regrease and you're good to go. Most of the friction is of course between the pass through shaft/clevis and the housing because this is where the axial pressure load is reacted, hence the PTFE/Nylon washer designed to react that load with the minimum friction.
Thanks for this new video! Very instructive. I have the valve of my 1L drysuit tank which is really hard to turn, now I know what to do.
Thanks, - but if this is your tank - and a planned maintenance - please do it when its empty :-) - take care
You are a legend...many thanks
great stuff, thank you Achim
I would add, when you put the nut back onto the threads with the tool or slotted screwdriver (the final step), that the nut should sit flush with the ends of the threads. Often I see these overtightened, which can be a problem.
Achim, does that spindle come into contact with the gas from the tank? I.e. can you use silicone grease (which works way better for this) or do you have to use christolube if for instance you will ever have 100% O2 (partial pressure blending)?
Great! Thanks you very much. Just one question, what would you do for fix the manifold?
this is some great theoretical knowledge! what brands do you recommend for valves for a twin set?
Excellent! Thanks for the video!
what type of grease should I use for compressed air ? do the greased parts come in contact with the gas ?
so good! Thanks
Theoretically , I fixed one of ours today :)
I serviced my own valve for the first time, before they worked great, I filled the tanks and they become very hard to turn so I take apart everything end put them back without Grease , oxygen grease and they work great 👌
Great video Achim. Very "Theoretical" thanks.
Please can you make a video about the valve in the middle of a twinset? How the complete valve is turning easier.
It's the same you just cannot do it while there is any pressure in the tanks because one of the tanks pressure is in that space that you open up.
Good video
Wie immer sehr informativ aber warum fliegt in Euren Videos immer Werkzeug oder Material durch die Gegend? Könnte man ganz normal ablegen :-)
What exactly do you put the lube on? Is that the o-ring and the washer, or something else? That wasn't easy to see on the video. Thanks a lot for the video, it is very helpful!
Dear Achim, If that o-ring has no sealing function and that is just basically a slider, what is sealing behind the HP-seat when the valve is open? Try to do this under pressur with partial open position and regulator is on the valve! The straight thread don't seal perfectly. ;)
Tanks