Document ID: FRepInstrJet Date: 2013-04-18
Approved by: Jonas Brandt
Subject: Field repair instructions - Jetstream
Author: Jörgen Nilsson Revision: 1.0
Poseidon Diving System AB
Page: 2 / 2
Setting the cracking pressure on the 2
nd
stage.
When the correct intermediate pressure has been set, it’s time to set the cracking pressure of the 2
nd
stage.
Make sure the +/- switch on the 2
nd
stage is set to the + position. (if a Jetstream/Oden 2
nd
stage)
Hold the 2
nd
stage in such position that the large diaphragm is horizontal and facing
downwards, towards the bottom of the bucket.
Slowly lower the 2
nd
stage in this position, in to the bucket of water until you hear a sizzling
sound from the low pressure valve, i.e. the 2
nd
stage low pressure valve opens.
Measure how deep below the surface the diaphragm is. If it is between 30 – 40 mm / 1.18 –
1.57 inches below the surface, the cracking pressure is within allowed parameters.
If the depth is bigger or smaller than 30 – 40 mm / 1.18 – 1.57 inches, the position of the
servo valve needs to be re-adjusted and the cracking pressure tested again.
immerse the 2nd stage as shown in the illustration. A sizzling sound from the servo-valve opening
shall occur within the two markings.
How to re-adjust the position of the servo valve.
Loosen the locking screw located on the valve house nut using the Allen key 1.5 mm. The
locking screw is accessible through the mouthpiece hole.
Use the Adjustment tool to turn the low pressure vale tube to move the servo valve closer to
the diaphragm (decreasing the cracking pressure) or further away from the diaphragm
(increasing the cracking pressure).
When the desired position has been set, tighten the locking screw and test the 2
nd
stage
cracking pressure as per above method.
Repeat until correct cracking pressure has been set.
If repairs and/or re-adjustments have been performed in accordance with these instructions, it’s
recommended that the regulator is re-checked in a controlled environment, with the proper testing
equipment, as soon as this is possible.
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