Posted by Kendall Raine on November 13, 2000 at 16:11:50:
In Reply to: Re: steel vs. alum.: where's the logic? posted by MHK on November 13, 2000 at 15:44:37:
The Jetstream is actually an "upstream" second as opposed to most other seconds which are downstream. MHK is right that the downstream free flows in the event of a high pressure seat failure. The Jetstream has a special overpressure relief valve in the hose which vents high pressure gas. I frankly don't know whether you can theoretically breathe a Jetstream when it's blown this valve, but the pressure alone would probably take your mask off.
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