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Hi Dale,
In a message dated 98-02-16 22:02:16 EST, you write:
<< ScubaPro just came out with a new first
stage - the Mark 14. It looks like a fat MK20. It is a balanced diaphragm
regulator with an incredable flow rate. It comes with T.I.S. as a standard
feature so it should be about the ultimate in cold water regulators.
Hope this helps.
Dale
>>
---------------------------------------------
Just wondering if you really want a high flow rate in a cold water
regulator ? Would this not be similar to the situation presented by a high
intermediate pressure that results in a greater drop in pressure from
intermediate to ambient and, therefore, a greater chance of forming ice in the
second stage ? With the high flow you would be transferring heat from the
mechanism to the gas faster because of a higher material flow rather than
because of a greater temperature change as in the case of the high
intermediate pressure.
The only time a high flow rate might be a problem would be if you were
passing a regulator off to another diver and it free flowed in the process or
any similar case that allowed it to flow much beyond what breathing would
induce.
Of course, the flow rate capability of the regulator wont matter if you
never allow it to free flow.
The Poseidons are high flow regs with a good cold water reputation though
they are reported to throw ice crystals from the second stage at times. I'm
not sure but this could be less of a danger with the Poseidon because of the
pilot valve design - perhaps it tends to blow the ice away from the seat
before it can cause a problem and this may not be the case with some typical
down stream designs.
I'm sure that the flow dynamics through the final second stage orifice
would be a factor but I'm not sure what one would look for to reduce the
chance of forming ice.
It seems that a large final orifice moving a relatively low intermediate
pressure of gas but at a higher volume would be the best bet for preventing
icing and getting a higher than usual flow as well.
Just thought I would throw this out for consideration, hope it's not off
base !
Chuck Boone
--
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