Questions about limitations of 68 micromag valve.

[Darkspidie1984]

Edited for clarity
I just got a ptp micromag in a trade and i love it. However when I rapid fire the gun vents my compressed air out of a hole in the back of the body below the valve and behind the last grip frame screw. Emptying my tank faster. it doesn't go away unless i take the the tank off.
I have included pics of my gun and the hole where the gun is leaking/venting my compressed air.

[UThomas]

It's a function of using CO2, not using a micromag vs an RT valve. If you're going to shoot Co2, get an expansion chamber and welcome to the mid 90's

[BigEvil]

Also when I rapid fired using co2 (As i had run out of compressed air) the gun vented out of the velocity adjustment area and then forze the valve leaving a coat of ice all over the outside of he valve.

Freezing - well if you are using CO2 then thats what you have to live with. You are NOT supposed to be using co2 with any rt valve to begin with.

However, the venting out of the back issue happens in your case because the co2 is much denser than hpa and the blow off thinks it is being over pressurized.

[Darkspidie1984]

It's a function of using CO2, not using a micromag vs an RT valve. If you're going to shoot Co2, get an expansion chamber and welcome to the mid 90's

Wow I must have confused you with my post. I was using compressed air when it was leaking out of the hole on the bottom rear of the marker. I only switched to co2 because the leak caused my 68/45 to empty much faster and consequently I had to switch to co2. ( we all can't be rich and own like ten tanks )
anyway when I switched to co2 after my 68/45 was empty I no longer had the leak but then the gun vented after rapid fire. Which non of the spyders or tippmans around me shooting busrt mode had any problems.

Oh and to BigEvil I was shooting co2 through an rt valve that is madness! I was shooting it through a stock mircomag vlave. My comment on my rt pro related to the comp air leaking out of my micromag after rapid fire.

So now can anyone answer my question?

[Spider-TW]

I think your answer is in the two posts above, just in the parts that were understood.

UThomas pointed out that you should have some arrangement to keep liquid out of the valve. A bottom line ASA is the worst thing for CO2 without something to catch the liquid.

BigEvil pointed out why it would vent. If you have all CO2 gas, it shouldn't be venting. Once you start putting liquid in there, it will turn to gas and vent somewhere.

What is your bottle to micromag regulator setup? If you have a good setup for CO2, you may have a weak reg piston oring. As long as the venting stops at some point, I would say the reg piston relief itself is good.

[Darkspidie1984]

Thank you spider on the co2 issue. So lets forget that and get to the real problem. I'll have to post a picture tonight To show where my compressed air is venting from becuase its hard to help everyone visualize the problem. Although I appreciate all the help.

[Darkspidie1984]

corrected original post to clear up confusion and added pics.

[Spider-TW]

If it shoots well, I would suspect the bottom oring on the on/off body. If you hold the trigger down, the leaking should stop if that's the case. Otherwise that leaves the main reg oring and the reg piston oring.

Being used, you should consider a new seal kit or at least take it apart and clean it and re-lube. I wouldn't put any CO2 in it without an anti-siphon tank. The line that is there now will stuff liquid straight in to the valve. Which can cause leaks then and later.

[secretweaponevan]

Liquid CO2 getting into the valve will cause that leak.
It is most likely the Regulator Seat freezing up.

Keep liquid CO2 out of your valve and you should be fine.

[Darkspidie1984]

Ok well I took every thing apart then cleaned and relubed it and the leak went away, but now all my air dumps out of the poweretube and down the barrel if i hold down the trigger. What could I have done wrong while putting it back together?

[michbich]

Ok well I took every thing apart then cleaned and relubed it and the leak went away, but now all my air dumps out of the poweretube and down the barrel if i hold down the trigger. What could I have done wrong while putting it back together?

Did you forget to put the on-off oring back? It's the oring that seals arround the on-off pin.

[Darkspidie1984]

Did you forget to put the on-off oring back? It's the oring that seals arround the on-off pin.

Ill take it out and look at it it may not be seated right. i know I put back the oring and then nested a small white delrin one inside it.

[secretweaponevan]

Ill take it out and look at it it may not be seated right. i know I put back the oring and then nested a small white delrin one inside it.

In that case, make sure you didn't put the on/off pin upside-down.

The groove should be close to the frame, not deep inside the valve.

[Darkspidie1984]

In that case, make sure you didn't put the on/off pin upside-down.

The groove should be close to the frame, not deep inside the valve.

omg I looked at it to and said to myself " which way does the groove face.?". Ill fix it when i get home. Hopefully this cures it. Thank you very very much. Hopefully the leak won't return when i fix it.

[secretweaponevan]

omg I looked at it to and said to myself " which way does the groove face.?". Ill fix it when i get home. Hopefully this cures it. Thank you very very much. Hopefully the leak won't return when i fix it.

You're welcome. Good luck!