X Valve goes full auto

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03-08-2018, 08:05 PM
tizon

X Valve goes full auto

Sorry guys, I thought I was doing the right thing by going back and posting to what I thought was the relevant thread...instead of making a new one.

So here is some video of what is going on.
https://youtu.be/a_yYv_xCGGA
03-08-2018, 09:19 PM
vintage

called rt effect, most people want this. pull the on off pin and measure the length. if I remember you said you had 850 psi into it and if it bounces like that you may need a longer pin. did you buy the valve used?
03-08-2018, 09:25 PM
RehKal

With the trigger fully pulled back it shouldn't be the RT effect. Can you feel the trigger pushing your finger forward when it does that? If the trigger stays fully back against the frame without moving it isn't RT effect.

If it is RTing, grats.. you have an easy one. Mine don't RT so easily. :)
03-08-2018, 10:07 PM
tizon

Quote:

Originally Posted by RehKal

With the trigger fully pulled back it shouldn't be the RT effect. Can you feel the trigger pushing your finger forward when it does that? If the trigger stays fully back against the frame without moving it isn't RT effect.

If it is RTing, grats.. you have an easy one. Mine don't RT so easily. :)

that is just holding the trigger down.
03-08-2018, 10:08 PM
tizon

Quote:

Originally Posted by vintage

called rt effect, most people want this. pull the on off pin and measure the length. if I remember you said you had 850 psi into it and if it bounces like that you may need a longer pin. did you buy the valve used?

I don't have calipers to measure it correctly, but I do have another RT on/off that I bought brand new from AGD and I compared them, they are the same.
03-08-2018, 10:09 PM
tizon

I bought the X valve new
03-09-2018, 08:26 AM
Billz804

That's not the RT effect, and I don't believe that most people want that, anyways.

Most people want an Automag that functions correctly and controllably!

I was having a similar issue to this at one point. Having just rebuilt my valve with new orings, I knew that I had good seals, but I worried that I had perhaps installed one incorrectly.

I was thinking that the On/Off was the culprit, but I did an experiment to rule it out -- remove the bolt and spring from your marker, install the valve, and hold the trigger down as you air up. If the marker seals, I believe that you may rule out the On/off as the problem.

After I did that, I opened the halves of my valve to inspect my orings. There is a smaller oring that gets stuck in the back half of the valve. Everything I've read has mentioned that it ought to actually go inside of the brass Reg Seat Holder piece, but I just pulled it out, oiled it, and replaced it into the hole on the rear of the valve.

Voila. Marker seals, fires one shot per pull (with just a little reactivity!), and seals completely when I hold the trigger back.

By the way, you can measure your trigger pin with a regular ruler if you don't have calipers. Obviously it isn't as precise, but .750 is equivalent to 3/4".

Hope that helps some!
03-09-2018, 09:05 AM
tizon

Quote:

Originally Posted by Billz804

That's not the RT effect, and I don't believe that most people want that, anyways.

Most people want an Automag that functions correctly and controllably!

I was having a similar issue to this at one point. Having just rebuilt my valve with new orings, I knew that I had good seals, but I worried that I had perhaps installed one incorrectly.

I was thinking that the On/Off was the culprit, but I did an experiment to rule it out -- remove the bolt and spring from your marker, install the valve, and hold the trigger down as you air up. If the marker seals, I believe that you may rule out the On/off as the problem.

After I did that, I opened the halves of my valve to inspect my orings. There is a smaller oring that gets stuck in the back half of the valve. Everything I've read has mentioned that it ought to actually go inside of the brass Reg Seat Holder piece, but I just pulled it out, oiled it, and replaced it into the hole on the rear of the valve.

Voila. Marker seals, fires one shot per pull (with just a little reactivity!), and seals completely when I hold the trigger back.

By the way, you can measure your trigger pin with a regular ruler if you don't have calipers. Obviously it isn't as precise, but .750 is equivalent to 3/4".

Hope that helps some!

Thanks for the reply, I tried the bolt off air up test and it was leaking out the front. I measured the on/off pin at 3/4".
03-09-2018, 10:05 AM
luke

I've seen a bad sear act this way, check the edge on the sear that catches the bolt for wear.
03-09-2018, 10:17 AM
tizon

Quote:

Originally Posted by luke

I've seen a bad sear act this way, check the edge on the sear that catches the bolt for wear.

Brand new sear
03-09-2018, 10:37 AM
luke

I would still inspect the sear and bolt edge instead of assuming it's good because it's new. I've purchased many 'new' things in my lifetime that were bad for one reason or another, and you posted here in tech for that exact reason. ;)

It'll take 5 minutes to disassemble the marker and inspect the parts, I would use a magnifying glass for close inspection. Could be you were sent a worn sear by mistake.
03-09-2018, 10:48 AM
tizon

Quote:

Originally Posted by luke

I would still inspect the sear and bolt edge instead of assuming it's good because it's new. I've purchased many 'new' things in my lifetime that were bad for one reason or another, and you posted here in tech for that exact reason. ;)

It'll take 5 minutes to disassemble the marker and inspect the parts, I would use a magnifying glass for close inspection. Could be you were sent a worn sear by mistake.

Your right, I just assumed it was new because it was in a new baggie and it was all shiney...I'll take a closer look
03-09-2018, 10:51 AM
luke

I'm certainly not saying you WILL find that is the problem but if everything is OK you can check it off the list.
03-09-2018, 10:55 AM
Billz804

If it still leaked when the trigger was held back, I believe it's safe to say that you have an issue in the on off somewhere.
03-09-2018, 11:00 AM
tizon

I'll go through and replace all the on/off o-rings
03-09-2018, 11:02 AM
tizon

Quote:

Originally Posted by luke

I'm certainly not saying you WILL find that is the problem but if everything is OK you can check it off the list.

agreed
it's in the details
03-12-2018, 05:14 PM
BIG BOB

Make sure you have both orings on top of the on off if it's an rt on off.
03-22-2018, 02:27 PM
athomas

Did you get this fixed? If you did, let us know what worked so that others can benefit from the insight.

I would guess that it is an on-off top oring issue. The only other oring that could cause a leak into the front chamber is the small one at the back of the regulator pin assembly.
05-20-2018, 10:31 AM
tizon

I gave up on trying to fix it myself.
I ended up just sending the gun to Tuna.
05-20-2018, 04:19 PM
Tunaman

Quote:

Originally Posted by tizon

I gave up on trying to fix it myself.
I ended up just sending the gun to Tuna.

I changed the mainspring and the L10 carrier to one tighter. I see nothing else wrong with it. Let me know when you get it back and try it.
05-20-2018, 07:40 PM
tizon

Quote:

Originally Posted by Tunaman

I changed the mainspring and the L10 carrier to one tighter. I see nothing else wrong with it. Let me know when you get it back and try it.

Played today with the x-valve mini, it played great, no chops, very crisp trigger pull, super happy about it
Now I'm thinking Xframe and ULT!
05-24-2018, 04:50 PM
tizon

Got around to cleaning the gun after going through 1/2 a case all day Sunday. Took the frame off the body, and gave everything a wipedown...put it back together and went to shoot in the backyard. Now it's back to shooting full auto again...