Retro Valve venting out back

[Spider-TW]

Thanks for all the replies everyone. I just wanted to say one other thing about how this valve is behaving and see if you all still this it's the regulator piston that needs replacing.

The venting only happens if it's the first time I put air through the marker after it's been sitting. If I pull the trigger it stops and then the valve functions perfectly. I can then de-gas the system and air it back up and it does not vent out the rear. I tried this probably 10 times tonight and it worked fine.

Again, I just wanted to make sure I was clear in the representation of this issue before I ordered a regulator piston from Tuna.

Thanks.

The piston may be sticking, causing excess pressure that is being vented properly. Have you changed the piston o-ring and cleaned the reg? A sticky piston will show up at the chrono also. The reg pin can be just as guilty though.

[robertreed711]

The piston may be sticking, causing excess pressure that is being vented properly. Have you changed the piston o-ring and cleaned the reg? A sticky piston will show up at the chrono also. The reg pin can be just as guilty though.

How will it show at the chrono? Inconsistency?

[Spider-TW]

How will it show at the chrono? Inconsistency?

Yes

[blackdeath1k]

Spider. I've sent tuna an email and a pm about getting a new one. And parts kits for my guns. I was just debating on messing with my wore out one once that is confirmed as my actual problem. But with the age. I would assume so.

[Spider-TW]

Spider. I've sent tuna an email and a pm about getting a new one. And parts kits for my guns. I was just debating on messing with my wore out one once that is confirmed as my actual problem. But with the age. I would assume so.

New parts are always good (well, almost always).

If you open it up, there's another thing to look for. The seal (urethane?) disc can get dented by the spring (I can't remember if these have a backing washer). If the seal dents from the spring, that relieves the tension of the spring that much, which is worth a quarter of a turn or so on the nut. If you flip the seal over, you eliminate the dent. I may be thinking of the micro ca check valve arrangement, but I think they are similar, with just a spring on top of a urethane disc.

So there's three things to mess up the piston relief;

Seal set
Spring creep
Dirt and debris

As long a Tuna and AGD has some in stock, there's not much left on a mag that we can't replace with some work. Eventually, we die-hards will need to know how to build or rebuild these pistons properly instead of leaving them as mystery safety parts.

[need4reebs]

is there anyway to tell the difference visually between the older and newer reg pistons with out taking them apart or swapping the reg pistons to see if it leaks??

i always just swap a unknown reg piston from a RT type valve that only has a lvl 7 bolt and test it in a different RT type valve with a lvl 10...if i get a leak ill write 7 on it...no leak ill write 10 on it...but sometimes tha writing wears off not to mention i drink alot of beers and just forget sometimes

they look identical tho which is why im asking? but when it comes to a part that AGD says is a non-user serviceable part or if Tuna recommends not trying to fix on your own its better safe than sorry to get a new one. same with buying a new sear...if i need a new sear ill only buy new or from someone i know or in person.

its not like the reg pistons go out all the time so spending 30 bucks to make sure your not sitting out of a game trying to trouble shoot your is worth it...and while your at it pick up a few extra o-rings and pay for the shipping all at once?

[blackdeath1k]

It crossed my mind to just make a solid one from brass on a lathe. But yes. As long as I can buy the correct parts I will. But for now. Parts kits and a piston are on there way. 4 dollars shipping isn't bad at all. And a 25 dollar piston..... can't complain.

What are we gonna do when the surplus parts dry up?

[need4reebs]

It crossed my mind to just make a solid one from brass on a lathe. But yes. As long as I can buy the correct parts I will. But for now. Parts kits and a piston are on there way. 4 dollars shipping isn't bad at all. And a 25 dollar piston..... can't complain.

What are we gonna do when the surplus parts dry up?

that would be pretty Sa WeeT if you could make your own. do you know the proper settings or have a way to test for those proper settings? thinking that would be the hardest part of making your own?

when ya gonna try it eh?

if tha surplus parts dry up that would be a bummer man...hopefully thats not something that will happen any time soon yo?

[blackdeath1k]

that would be pretty Sa WeeT if you could make your own. do you know the proper settings or have a way to test for those proper settings? thinking that would be the hardest part of making your own?

when ya gonna try it eh?

if tha surplus parts dry up that would be a bummer man...hopefully thats not something that will happen any time soon yo?

Sorry if I wasn't totally clear. If I made my own it would just be a solid brass piston with the indention for the needle. And the o ring groove. So no spring. No venting capabilities. There for it would be a personal deal for personal use. Other option with the same outcome would be dismantling a stock piston. And using a solid shim instead of a spring inside. But there again. The relief capability would not be there. And actually the second option is what I may mess with once my gun has the venting issue stopped with factory parts.

[blackdeath1k]

As long a Tuna and AGD has some in stock, there's not much left on a mag that we can't replace with some work. Eventually, we die-hards will need to know how to build or rebuild these pistons properly instead of leaving them as mystery safety parts.

Knowing how TK is with everything else. I've got a feeling that the factory specs will come out to the public or something to help salve any problems with this.

[need4reebs]

here is a how-to-video...but even tha dood working on the reg piston says its a temporary fix?

http://www.youtube.com/watch?v=wfcnqeIznLQ

[blackdeath1k]

here is a how-to-video...but even tha dood working on the reg piston says its a temporary fix?
http://www.youtube.com/watch?v=wfcnqeIznLQ

Temp for the next 10 years.

[need4reebs]

Temp for the next 10 years.

haha...ya never know man???

10 years is a long time to even think about eh...day by day is as far as ill look ahead ya kno?

hope that video helped ya out some tho.

[Justus]

Does Tuna rebuild these? Assuming that there's a time that all suppliers are out of these, how hard would it be to source the spring and urethane seal to have rebuilds done? I may be playing chicken little here, but you just have to go back a couple years to remember when the very last 4.5k Flatline reg seats were sold off.

[blackdeath1k]

Just got to watch the vid. That looks more functional than what I'm thinking about. I'm thinking seal it up tight where it might as well be a solid chunk of brass.