Strange leak on a pneumag???

[sTaLa]

I'm almost done with my pneumag, I aired it up and found the trigger pretty heavy for a "hair trigger". So I took a look at my tickler LPR and found that it was at max flow. So I lowered the pressure. The setup works nicely but every time I pull the trigger, a lot of air escapes from the hole pointed on the picture. And if I hold the trigger the flow of air keeps going. Is it normal? Did I screw my msv-2 the first time I aired it because there was too much pressure?



Thanks,
Alex

[longi]

Don't worry thats supposed to happen, it's a 3 way valve, thats one of the exhaust ports where any excess air escapes.

[sTaLa]

Ok... but I thought maybe it was the reason why sometimes the trigger doesn't come back. It stays stock and the air keeps flowing out of the 3 way. Like if there was not enough force from the valve to reset. Plus, I spent almost 1000 psi with only the pneumag (the mag valve was disconnected) with maybe 200 shots (I have to say the trigger got stock)

[sTaLa]

And I have a QEV... shouldn't the excess of air escapes from the QEV instead of the 3 way

[echoback]

First:
Is the 3-way letting out air when you *pull* the trigger, or *release* it?

Then:
Try moving the QEV closer to the 3-way. The way it appears set up, the 3-way is the one discharging all the air, instead of the QEV. You want the QEV really close to the 3-way so as soon as the 3-way cuts off the air, the QEV starts discharging the actuator line.

For the sticking:
Move the QEV first. I'm guessing the 3-way is sticking because the pressure from the air in the actuator line is keeping it open. If moving the QEV doesn't solve it, the LPR may be set too low, try fiddling with it a bit.

[sTaLa]

First:
Is the 3-way letting out air when you *pull* the trigger, or *release* it?

Both, it lets out air when the trigger is pushed. My hypothese is that since the valve is open and the system is air tight, the msv-2 cannot contain the air and always lets out air. IMO, it would be better if the air stayed in the system... anyway.

Try moving the QEV closer to the 3-way. The way it appears set up, the 3-way is the one discharging all the air, instead of the QEV. You want the QEV really close to the 3-way so as soon as the 3-way cuts off the air, the QEV starts discharging the actuator line.

I thought the QEV needed to be as close to the actuator as possible

For the sticking:
Move the QEV first. I'm guessing the 3-way is sticking because the pressure from the air in the actuator line is keeping it open. If moving the QEV doesn't solve it, the LPR may be set too low, try fiddling with it a bit.

I removed the QEV and it seems to work fine... I guess I'll simply go with the no QEV option... I don't think it will change really anything since the msv-2 exhausts the air.

[echoback]

Yeah, forgot a little line up there: I am not a pneumag maker, I just know stuff about pneumatics. Use whatever works, you probably know as much as I do.

[longi]

Did you say that the arm sticks? If the arm sticks you may find that that it's getting stuck on the intelliframe mount. You can find this out by loosening the MSV-2. The Msv-2 still lets air thru regardless of whether you have a QEV. It still runs at pressure and will find a way to leak out if it can. Also, and i don't mean to insult you or be rude in any way, but is the QEV connected correctly? It also looks like you have a fair bit of excess hose in the picture, this might also cause you problems. If you want a super light trigger, you need to make sure that the rod has been rounded off as much as possible at the end which makes contact with the trigger, otherwise the rod scrapes up the back of the trigger causing lots of friction making the trigger pull very heavy and makes you wonder why you bothered! If you have a bench grinder, round the end of the rod off. It makes all the difference. Experiment with the MSV-2, try different angles with the MSV-2 as this also make a huge impact on the trigger performance. Clippard also do 90 deg swivel bends to minimize the length of hose between the actuator/QEV/MSV-2 etc...It all makes a difference.

[sTaLa]

The QEV was well connected yes, I double checked; no offence.
When I talked about sticking issues, it was concerning the MSV-2 that didn't come back, therefore the trigger didn't come back either. When I removed the QEV it solved that problem. And to be honest, I don't have any skill at walking yet so I don't think I'll outrun my pneumag with my fingers even if it doesn't have a QEV. And it is fairly light: it doesn't fire if I blow on the trigger but I accidently fired a couple of times only by touching the trigger.

I also milled the hell out of the QEV and it was quite tight. Plus the hose passed right where the QEV's exhaust was: that might explain why the QEV was a problem.

[longi]

Okidoki. Could be that the QEV is faulty or you have some swarf inside the QEV inhibiting it's operation, probably swarf by the sounds of it. Nice install by the looks of the picture though, very neat!