apeks ds4 at low pressure

paulraymaekers · 1st May 2005, 08:03

hello, today I testet my rEvo electro, the electronically controlled version of the rEvo CCR

I use an apex ds4 for oxigen, and turned down the MP to +/- 3 bar, so not to have to much pressure on the electrique valve

but at 20 meter, no more flow when the valve opens or when I push the manual addition button

??? seems the apeks does not follow the depth - related pressure when used at low pressure!!!

anyone can explain??????

and before someone asks, no, I did not block the membrane to get constant absolute pressure :-)

paul

decoweenie · 1st May 2005, 10:18

Quote: (Originally Posted by paulraymaekers)

...no, I did not block the membrane to get constant absolute pressure :-)...

Damn, that'd would have been an easy anwer...

FYI, the YBOD IP is around 6-6.5 bar. Why not keep in the same range ?

Joseph Grech · 1st May 2005, 10:38

Did you put the black plunger in place ?

paulraymaekers · 1st May 2005, 14:00

I noticed my valve does not always open at 5-6 bars, although rated up to 6.5 bars

and yes, the black plastic plunger is in place

regards

paul

***jradomski*** · 1st May 2005, 20:59

Quote: (Originally Posted by paulraymaekers)

I noticed my valve does not always open at 5-6 bars, although rated up to 6.5 bars

and yes, the black plastic plunger is in place

regards

paul

Why not switch to a more reliable valve.. The HH uses snaptite valves.. they are rated at ~10 bar, but will still operate up to about ~30bar!!!

The wattmeiser series (and some clones) are probably the most popular solenoid being used for Rebreather designs.. (excluding the custom one AP uses)

You should also check your voltage/current. It might not be the pressure, you might not be supplying enough potential... most solenoids require at minimum 100ma to initially operate (rated pressure) the current required gets reduced at lower pressures..

Once the solenoid is open it takes less current/voltage to keep it open..

1st May 2005, 08:03	#1 (permalink)
paulraymaekers rEvo's daddy Current Rebreather/s: rEvo Other CCR Home Build Other Rebreather/s: rEvo Other CCR Home Build Join Date: May 2005 Location: belgium Posts: 1,638	apeks ds4 at low pressure hello, today I testet my rEvo electro, the electronically controlled version of the rEvo CCR I use an apex ds4 for oxigen, and turned down the MP to +/- 3 bar, so not to have to much pressure on the electrique valve but at 20 meter, no more flow when the valve opens or when I push the manual addition button ??? seems the apeks does not follow the depth - related pressure when used at low pressure!!! anyone can explain?????? and before someone asks, no, I did not block the membrane to get constant absolute pressure :-) paul
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1st May 2005, 10:18	#2 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,487	Quote: (Originally Posted by paulraymaekers) ...no, I did not block the membrane to get constant absolute pressure :-)... Damn, that'd would have been an easy anwer... FYI, the YBOD IP is around 6-6.5 bar. Why not keep in the same range ?
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1st May 2005, 10:38	#3 (permalink)
Joseph Grech Joseph Grech Current Rebreather/s: Azimuth Other Rebreather/s: Azimuth Join Date: Mar 2005 Location: Malta Posts: 104	Did you put the black plunger in place ?
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1st May 2005, 14:00	#4 (permalink)
paulraymaekers rEvo's daddy Current Rebreather/s: rEvo Other CCR Home Build Other Rebreather/s: rEvo Other CCR Home Build Join Date: May 2005 Location: belgium Posts: 1,638	I noticed my valve does not always open at 5-6 bars, although rated up to 6.5 bars and yes, the black plastic plunger is in place regards paul
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1st May 2005, 20:59	#5 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Join Date: Mar 2005 Location: "Da" Bronx Posts: 3,113	Quote: (Originally Posted by paulraymaekers) I noticed my valve does not always open at 5-6 bars, although rated up to 6.5 bars and yes, the black plastic plunger is in place regards paul Why not switch to a more reliable valve.. The HH uses snaptite valves.. they are rated at ~10 bar, but will still operate up to about ~30bar!!! The wattmeiser series (and some clones) are probably the most popular solenoid being used for Rebreather designs.. (excluding the custom one AP uses) You should also check your voltage/current. It might not be the pressure, you might not be supplying enough potential... most solenoids require at minimum 100ma to initially operate (rated pressure) the current required gets reduced at lower pressures.. Once the solenoid is open it takes less current/voltage to keep it open.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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