Neck leaks
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DiveGearExpress
Contributor
As mentioned by others, the primary cause of neck leaks is corrosion and debris around the neck and valve sealing surfaces. We've never seen that the durometer of the neck o-ring made any difference to neck leaks, and we've used both Shore 70A NBR (aka nitrile, Buna-N, etc) and Shore 90A FKM (aka FPM, Viton, etc) O-rings.
In addition, on what are otherwise clean and properly prepared cylinders, we have encountered leaks caused by lubricant. Either existing lubricant that was not removed from the sealing surfaces or lubricant that was applied to the tank neck O-ring.... all of the lubricants seemed to occasionally be involved, but so called 'Super Lube' was the most noticeable cause. In the opinion of Mark G at PSI, it is only excessive lubrication on the O-ring and sealing surfaces that will cause neck leaks, but when we stopped lubricating entirely the occasional tank neck leaks stopped as well.
www.divegearexpress.com
In addition, on what are otherwise clean and properly prepared cylinders, we have encountered leaks caused by lubricant. Either existing lubricant that was not removed from the sealing surfaces or lubricant that was applied to the tank neck O-ring.... all of the lubricants seemed to occasionally be involved, but so called 'Super Lube' was the most noticeable cause. In the opinion of Mark G at PSI, it is only excessive lubrication on the O-ring and sealing surfaces that will cause neck leaks, but when we stopped lubricating entirely the occasional tank neck leaks stopped as well.
Lubrication and SCUBA Valve Installation | Dive Gear Express®
Lubrication and SCUBA Valve Installation In general purpose applications, the lubrication of joining threads will reduce galvanic action between dissimilar metals and when joining ...
www.divegearexpress.com
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