Quote: (Originally Posted by
Barrie Law)
Hi Phil,
Did you find a big difference between the flow rates on the QC4 and the QC6 as I considering fitting one directly to the BOV 2nd stage so it can then be supplied from any cylinder I have including O2.
When you say you are not a big fan is that of BOV's in general or of this one in particular?
Barrie,
The all thing started with the Boris since I wanted the flexibility of using the hose as either for the offboard or for a bailout 2nd stage. The QC4 that CCRB sell for the Boris/Sentinel is
1) coded so you can not cross them DIL to O2 or vice versa, which is a good safety feature. In my case since I wanted to use them to feed a 2nd stage and the coding was an issue. I had to choose to mount the coded DIL or O2 connector on the 2nd stage or have two 2nd stage.
2) Also after looking at Swagelok specs I realised that the way CCRB use the QC4 in terms of gas flow is the wrong way around, after speaking with Swagelok they say the impact would be minimal at 10 bars
So based on the above and also from other divers experience I decided to go for QC6. The drawback with QC6 is that they are bulkier and finding the right fittings can be difficult in order to avoid too many adapters and keeping the connector streamline.
Concerning the BOV it is a general feeling and not just for the Sentinel.