Marek K
Contributor
I've just bought my third Sherwood Magnum regulator since 1986. This one is a current-model SRB 9310:
I've got a couple questions that the Sherwood web site doesn't cover...
First, this has a venturi assist second stage; my older Magnums didn't. I've never had a reg with this kind of adjustment. I notice when breathing in, there's a bit of resistance at first; then I hear a "pop" from somewhere in the second stage, and the breathing resistance gets much, much better. This only happens underwater, and seems to be more pronounced as tank pressure goes down.
Is this the venturi system kicking in? If not, should I be worried?
Second, I read somewhere that the first stage has the typical Sherwood overpressure sealing system, that lets out a tiny stream of very fine bubbles that freaks people out that don't know about it. I haven't had a dive buddy look for the bubbles yet, but is that how this works? There isn't a rubber valve in the first stage body like on the previous models...
I've got a couple questions that the Sherwood web site doesn't cover...
First, this has a venturi assist second stage; my older Magnums didn't. I've never had a reg with this kind of adjustment. I notice when breathing in, there's a bit of resistance at first; then I hear a "pop" from somewhere in the second stage, and the breathing resistance gets much, much better. This only happens underwater, and seems to be more pronounced as tank pressure goes down.
Is this the venturi system kicking in? If not, should I be worried?
Second, I read somewhere that the first stage has the typical Sherwood overpressure sealing system, that lets out a tiny stream of very fine bubbles that freaks people out that don't know about it. I haven't had a dive buddy look for the bubbles yet, but is that how this works? There isn't a rubber valve in the first stage body like on the previous models...
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