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On Fri, 3 Feb 1995 Christina_Young@Wa*.Me*.co* wrote: > > I would think, from a systems engineering viewpoint, that if the intermediate > pressure is the same, it would not matter. If the output of both first > stages is set at 170 psi (also not to exceed 170 psi), for example, this > input into the second stage would be the same regardless. When I say this, > I am thinking of the first and second stages as two separate black boxes, > their only communication with each other being the intermediate pressure. 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 IP=intermediate pressure /Sten Meyer m87stme@mt*.ch*.se*
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