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Sten, Yes, I had thought about 1st stage reaction to pressure being drawn by the second stage. That is why I stated, "pressure not to exceed 170 psi". When the IP is set at 170 psi, for instance, on the Odin, does this mean that when pressure is drawn (resulting in an IP drop, recognized by the feedback loop of the 1st stage), the IP *exceeds* 170 psi??? If this is so, then I would think to achieve a similar result with either first stage while using a Cyklon 2nd stage, you would need to set the IP using the true maximum, which would be: IP to be set = (static IP) + (IP boost during draw). I think this would compensate for John's statement that a Cyklon 2nd stage would be more prone to free flow if used with an Odin first stage. Comments? Christina --------------------------------------------------------------------- Sten Meyer <m87stme@mt*.ch*.se*> writes: The diffrence, as I understand it, is that the hole from the "R" outlet to the membrane chamber is larger (ca 5mm) in the Jetstream firststages. The Cyklon (5000) first stage has a smaller (ca 2mm) hole. This hole is supposed to boost the IP when there is a large flow from the "R" port. The Jetstream can be used on the Cyklon first stage "R" outlet with marginaly reduced performance but the Cyklone may have problems if fitted to a Jetstream "R" port. The reason for this is that the downflow Cyklon my not be abel to close against the higher pressure put form the Jetstream at the high flow. When my Jetstream was serviced last vinter the HP-seat was changed. The current seat had an other diameter. This meant that the IP vs flow characteristics of my first stage changed. Now the IP is steady when the main reg is purged. With the old seat the IP rose with almost 2 bar when there was a high flow from the "R" port. So the short answer to your question is that there is more than IP that matters. Whith an electrical analogy you cold compare it to the internal impedance in a battery. Even if the voltage is right when no current is drawn it may change when current is drawn. /Sten
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