Can't get my velocity low enough

[punkncat]

I just picked up a new mag from a guy, have commented on it a few times. I had a fixed HP Dye bottle that wouldn't flow well enough to keep me from getting shoot down and chuffs, but even with it, I had to put the gold spring in to get the velocity under 300. I had to turn the valve/reg out all the way to right at the point of not running to make it shoot 275, and even then it was having shootdown terribly.

I just did pick up a Raptor Rex, and they come preset from the factory at 750PSI, which is 100PSI lower than the Dye reg is supposed to be. I did not adjust the valve/reg, just installed it and aired it up in the same working configuration that I played with last weekend. The thing is RT'ing SUPER nicely, even at the 750, but could tell the velocity was well high. I went over to the chrono, and was shooting 415FPS, yes 415!

I tried turning the valve/reg down, but it was already so low that it started shootdown and chuffing, not cycling properly. I turned it back up until the valve was working right, and attempted to turn the Raptor down to compensate. Almost immediately I could see that wasn't going to work and was just putting too low an input pressure to the valve, and turned it back to 750.

As I mentioned, the RT effect is amazing, and the valve is cycling perfectly, no shootdown, and getting hot after firing a string, just like I have read about. However, even after just dry firing 4 tanks of air though to try and break in the regs on both...the Raptor is BNIB, and the mag was purchased new in June and not even shot enough to get past the initial break in period. It isn't leaking, no chuffing, but I litterally cannot get the marker to shoot right below 300 FPS. It is actually running a pretty consistant 320-ish after the four tanks of dry firing. It is well lubed, and as mentioned, has the gold (low velocity) spring in. I won't even mention what it was shooting with the red spring....

I was of the understanding that part of the built in safety mechanisms of these valves, and have seen it first hand, was that it would vent out the back a bit over 300FPS...well, this one is FAR from that. I cannot get a safe velocity out of it at all.

With all that said, what am I missing, what do I need to replace, or does this valve need to be sent back in and replaced? What?

Please shoot me your ideas, I would really like to use this marker at AO South in two weeks, but someone may get a little upset when I blaze them at this kind of velocity.

[aerosaaber]

I believe the valve only vents when the air pressure is too high, nothing to do with the velocity it's shooting.

Other than that I don't have enough experience with Mags to offer further advice.
When I went from a standard ninja tank to my 1200psi ninja tank I had to dial the velocity back a pretty good amount. (No additional regs in my setup though)

[Coralis]

regulator pin isn't damage or missing parts ? or missing an on/off oring

[factoid]

I just picked up a new mag from a guy, have commented on it a few times. I had a fixed HP Dye bottle that wouldn't flow well enough to keep me from getting shoot down and chuffs, but even with it, I had to put the gold spring in to get the velocity under 300. I had to turn the valve/reg out all the way to right at the point of not running to make it shoot 275, and even then it was having shootdown terribly.

I just did pick up a Raptor Rex, and they come preset from the factory at 750PSI, which is 100PSI lower than the Dye reg is supposed to be. I did not adjust the valve/reg, just installed it and aired it up in the same working configuration that I played with last weekend. The thing is RT'ing SUPER nicely, even at the 750, but could tell the velocity was well high. I went over to the chrono, and was shooting 415FPS, yes 415!

I tried turning the valve/reg down, but it was already so low that it started shootdown and chuffing, not cycling properly. I turned it back up until the valve was working right, and attempted to turn the Raptor down to compensate. Almost immediately I could see that wasn't going to work and was just putting too low an input pressure to the valve, and turned it back to 750.

As I mentioned, the RT effect is amazing, and the valve is cycling perfectly, no shootdown, and getting hot after firing a string, just like I have read about. However, even after just dry firing 4 tanks of air though to try and break in the regs on both...the Raptor is BNIB, and the mag was purchased new in June and not even shot enough to get past the initial break in period. It isn't leaking, no chuffing, but I litterally cannot get the marker to shoot right below 300 FPS. It is actually running a pretty consistant 320-ish after the four tanks of dry firing. It is well lubed, and as mentioned, has the gold (low velocity) spring in. I won't even mention what it was shooting with the red spring....

I was of the understanding that part of the built in safety mechanisms of these valves, and have seen it first hand, was that it would vent out the back a bit over 300FPS...well, this one is FAR from that. I cannot get a safe velocity out of it at all.

With all that said, what am I missing, what do I need to replace, or does this valve need to be sent back in and replaced? What?

Please shoot me your ideas, I would really like to use this marker at AO South in two weeks, but someone may get a little upset when I blaze them at this kind of velocity.

The valve will vent if the pressure is too high, but that threshold is quite a bit higher than 300FPS worth of pressure.

I don't know if it will make a difference or not but if you've got another valve around maybe try swapping the spring packs and pistons. Probably the spring pack since your piston isn't venting even at high pressure.

[punkncat]

It seems like the regulator on the valve is working, it does turn up and down in pressure. I just wonder if there is some issue where it is going from "off" or almost no pressure, right up to a "high" pressure?
Still, with this adjustable tank reg, I have tried to use it to lower the velocity and get flow issues just barely below the 750 preset it came with.

I just don't get it.

[Ando]

Hmm...Strange

Don't know what to tell you brother.

Might want to tear into the valve and make sure everything is where it needs to be. Something might not be seating properly or installed backwards like the reg seat holder (32). Try re-seating or replacing oring 31. Velocity issues usually come from that oring.

EDIT: Also, clean out the back housing where the reg piston (25) and springs (26 & 27) sit.

[Spider-TW]

if this were on a classic valve, I would say the spring pack is upside down.

If your reg springs are in good condition, I would have to look in the reg pin seals or reg seat. The reg piston could be very sticky, but that would be some serious sticky and build-up on the reg bore. Not likely on a relatively new marker.

On second thought, your comments about the bolt spring make me wonder if the level 10 o-ring is super tight. The bolt should slide on and off the power tube without too much of a fight.

Are you confident in your pressure gauge reading of 750? That's very low for good RT. Maybe the raptor rex is running low or flat out and the gauge is not reading correctly. Maybe its spring pack is upside down.

[punkncat]

The raptor is brand new, never has been used. I have tried it on two guages and both are reading the same thing. The mag valve is also basically brand new, not even dirty inside, or even behind the bolt yet.
The level 10 would be 100% perfect, IF I could get the veolocity low enough on the long red spring, like bouncing off your tongue good. Even with the gold spring, it is doing pretty well, and slides off the bolt with very little friction.

Aside from this, the marker shoots GREAT. After shooting it some more today, I am getting +/-2-5 BPS on the chrono, using the hold the trigger method....just high velocity.