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| Originally Posted by Diver Mole's website I fitted an Apeks Shut off valve inline with the ADV so I can disable it easily is there is a problem or free flow. Also this makes pressure testing the unit easier. I've since removed it due to comments by Dave Thompson, who pointed out that it provided no extra safety and was an extra 4 failure points. |
Although I have a lot of time for Stephen (Diver Mole) I tend to count failure items not failure points in detail. A shut off valve either works or it doesn't - one point. I like having a shutoff valve on the ADV as it helps doing neg tests and as I have the ADV set a bit loose and it might freeflow or seep a bit diving - heck the Auto Air does that often enough. I have another shutoff on the oxygen second stage regulator and I've seen a diver without one dump most of their O2 when it got jammed somewhere with the purge pushed (Plymouth May 2004).
nigelH