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DIR: Discuss Manifolds/valves in the Technical and Specialist Diving Forums forums: I'm about to buy a set of 232 bar 12's. Does it have to be captured o-rings ...

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Old 13-01-05, 02:40 PM
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Manifolds/valves
I'm about to buy a set of 232 bar 12's.

Does it have to be captured o-rings for DIR or is that just "optimal". Is optimal mandatory?

I checked on the GUE website but could only find this...

Quote:
Tanks/Cylinders: Students may use dual tanks/cylinders connected with a dual outlet isolator manifold, which allows for the use of two first-stages. Students may also use a single tank/cylinder with a K, H, or Y-valve.
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Old 13-01-05, 02:50 PM
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Originally Posted by Gavin Smith
I'm about to buy a set of 232 bar 12's.

Does it have to be captured o-rings for DIR or is that just "optimal". Is optimal mandatory?
Ask yourself why you want a Sub-optimal item. The whole point of DIR is that everything is as optimal as possible. The whole system is designed around this concept.

If the answer is "I can't get a barrel o-ring manifold in this part of the world" then you may have to do with what you can get. If the answer is "The proper manifold is £20 more expensive" then I'd suggest just spending the extra money.

HTH
John
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Old 13-01-05, 03:08 PM
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I've never been convinced that the barrel 'O' ringed manifolds are any better than the MDE ones with the facing 'O' rings. The MDE manifolds seem a lot beefier than those you consider 'optimal' and appear to be bulletproof.
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Old 13-01-05, 03:39 PM
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Originally Posted by nickb
I've never been convinced that the barrel 'O' ringed manifolds are any better than the MDE ones with the facing 'O' rings. The MDE manifolds seem a lot beefier than those you consider 'optimal' and appear to be bulletproof.
If you have a chat with Divequip (www.divequip.co.uk and the ex technical manager of MDE) he tells a story of a test they did with a twinset full of water pressurised to god knows what being yanked up and down on a crane by the manifold. Not a peep out of it...
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Old 13-01-05, 03:49 PM
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These's an MDE manifold hissing away in my cellar. Old style admittedly.

Anotheradvantage of the barrel o rings is the ability to rotate the islator bar when the thing is under pressure, although this isn't something you should do on a regular basis. You can't do this with facing O rings. It's nice to be able to adjust the isolator position if it's a bit "off". Minor stuff, I know.

Cheers,

Rich
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Old 13-01-05, 03:56 PM
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Quote:
Does it have to be captured o-rings for DIR or is that just "optimal". Is optimal mandatory?
Hi Gavin,

No one is going to send you home from a Fundamentals course in disgrace if you have a manifold with facing o-rings if that's what you are worried about... so if you have access to a cheap set of doubles get them. You can always replace the manifold later

Agir do a nice one.

Fraser.
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Old 13-01-05, 04:02 PM
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Quote:
Originally Posted by Fraser
Hi Gavin,

No one is going to send you home from a Fundamentals course in disgrace if you have a manifold with facing o-rings if that's what you are worried about...
Fraser.
Thanks.
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Old 13-01-05, 09:02 PM
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Quote:
Originally Posted by RichW
These's an MDE manifold hissing away in my cellar. Old style admittedly.

Anotheradvantage of the barrel o rings is the ability to rotate the islator bar when the thing is under pressure, although this isn't something you should do on a regular basis. You can't do this with facing O rings. It's nice to be able to adjust the isolator position if it's a bit "off". Minor stuff, I know.

Cheers,

Rich
I can also do this with my MDE manifold (new style) without any problems. Mind you, it is set up correctly
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