Dive Bottle Test - Short & Curly's?

[acmsarh]

What you have to be aware of as well is how they remove and refit the valve , all of the valves have a different profile ( you imagine a socket that has to fit over a valve to remove it) now at MDE we used to make them to fit any valve profile but a lot of places did not want to pay the £100+ for the real deal so a big spanner used to make do and with the 5/8 din valves an 5/8 thread was machined onto a bar and the valve was taken out using that plus a hammer and refitted the same way and not using a torque wrench to refit , The over zealous use of the hammer could result in the din threads distorting sideways.

[Aimstraight]

What you have to be aware of as well is how they remove and refit the valve , all of the valves have different profile ( you imagine a socket that has to fit over a valve to remove it) now at MDE we used to make them to fit any valve profile but a lot of places did not want to pay the £100+ for the real deal so a big spanner used to make do and with the 5/8 din valves an 5/8 thread was machined onto a bar and the valve was taken out using that plus a hammer and refitted the same way and not using a torque wrench to refit , The over zealous use of the hammer could result in the din threads distorting sideways.

That is a very good point. It says on my Test Certificate Valve Torque 100 Nm (75 ft.lb), if that was applied as a side load via the DIN outlet thread it might not do it any favours, worst still if it was an impact/shock load to loosen it. One would hope the EN/BS lays down the appropriate method, maybe not.