Poseidon Cyklon 2950
- Thread starter Crazy_Ivan
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Don't have an answer to your question, but the 'R' port is for your primary second stage. It provides a venturi assist for higher flow rates. I'm almost certain that that "hole" has something to do with this venturi assist.
rx7diver
It is known as a #3587 "Restrictor screw for first stage No. 3585 Cyklon 5000" -- #12 on the diagram below; had to dig through a few of my manuals to find it . . .
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I'm not intimately familiar with Poseidon's regulators, but I assume it has the same function as in a few other diaphragm first stages.
The design takes advantage of some clever aerodynamics (venturi effect), which work as follows. Air that flows from the direction of the seat towards the LP outlet passes by this hole. Simplifying a bit, as the air passes this hole the relative air pressure in that bore will drop relative to the air passage towards the LP outlet. This drop in relative pressure creates sort of a "suction" force on the air underneath the diaphragm, pulling it down, thus pulling the diaphragm down.
This in turn means that intermediate pressure drops less on inhalation as the system becomes more stable/reactive.
Other manufacturers have similar system, Mares for example calls it DFC - Dynamic flow control.
I'm sure this video can explain a lot better what my poor wording and drawing try to convey.
The design takes advantage of some clever aerodynamics (venturi effect), which work as follows. Air that flows from the direction of the seat towards the LP outlet passes by this hole. Simplifying a bit, as the air passes this hole the relative air pressure in that bore will drop relative to the air passage towards the LP outlet. This drop in relative pressure creates sort of a "suction" force on the air underneath the diaphragm, pulling it down, thus pulling the diaphragm down.
This in turn means that intermediate pressure drops less on inhalation as the system becomes more stable/reactive.
Other manufacturers have similar system, Mares for example calls it DFC - Dynamic flow control.
I'm sure this video can explain a lot better what my poor wording and drawing try to convey.
OP
Crazy_Ivan
New
Thank you all for the replies.
I started to wrap my head around this, and you all are correct, it's a venturi assist for the primary second.
I also have a 2960 with Jetstreams. The hole is there, but no restrictor plate. I guess the 2950 has the ristrictor due to the higher IP of the Cyklon.
I started to wrap my head around this, and you all are correct, it's a venturi assist for the primary second.
I also have a 2960 with Jetstreams. The hole is there, but no restrictor plate. I guess the 2950 has the ristrictor due to the higher IP of the Cyklon.
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