Valve wont fill past 3000psi?

[Rob_in_NC]

Morning, all

Originally, I had thought perhaps that my CF tank was leaking. I would fill it up with the compressor and then some days later, use it to fill a gun and it would only fill to right at 3kpsi.
Today, I topped it off and it was near 4kpsi. Filled to just under 4500 and went to fill a gun. Simply will not go past 3k psi. Not on the tank gauge, nor the gun gauge. I know the gauge works because it showed near 4500psi when filling. Leaves the valve far as I can tell. Also tried another whip on it. Same thing.
Anyone hear of such before? I'd just bought this valve a couple years ago and has seen light use.
pic shown to see the type of valve and tank.

 

[AlanMcD]

Never heard of that before, at least not with a regulator in the system . . . .

What happens when you dead head the line? Do you get full tank pressure into the line? If so, that would indicate the issue is at the gun end and not the tank end . . .

Not sure what else to offer up . . .

 

[Gerry52]

Does that male foster in your fill setup have a check valve in it? I can't think of any other reason it would stop at 3K. I've seen check valves with adjustable springs that cut off at certain psi. If so, remove it.

 

[Rob_in_NC]

No spring in the check valve... I'm at a loss as well. Talked with Grackleblast who has a valve for me so will give that a go. I got the valve from PA a couple years ago and was advertised as a 'slow fill' valve and most of my guns that I was shooting at the time only filled to 3kpsi so I didnt pay it much attention. Then when I did notice it, I just grabbed another tank. Now it's irritating me enough to dive into it. But think Grackleblast las me squared up!

 

[MrP]

What about the deadhead test? Does the line reach 4500 psi?

 

[Rob_in_NC]

Unfortunately, I dont have a deadhead to test with... but would be interesting and now this has me questioning if the valve I got was somehow regulated to put out 3k.

 

[Back_Roads]

It doesn't look to be regulated, that was my first suspicion.

 

[Ratzy]

Morning, all

Originally, I had thought perhaps that my CF tank was leaking. I would fill it up with the compressor and then some days later, use it to fill a gun and it would only fill to right at 3kpsi.
Today, I topped it off and it was near 4kpsi. Filled to just under 4500 and went to fill a gun. Simply will not go past 3k psi. Not on the tank gauge, nor the gun gauge. I know the gauge works because it showed near 4500psi when filling. Leaves the valve far as I can tell. Also tried another whip on it. Same thing.
Anyone hear of such before? I'd just bought this valve a couple years ago and has seen light use.
pic shown to see the type of valve and tank.

View attachment 577692

I've seen it on some fill valves. Why, I haven't a clue, but it is always the more restrictive flow valves. The ones that fill fast to REALLY fast never have the problem.

But it also has always gone away.

 

[Scotty1]

I would try pulling the knurled adapter from the valve and check for restrictions or an extruding o-ring?

 

[SilentSquirrel]

May I suggest checking to see if the tank's pressure relief valve is leaking when the pressure gets above 300B?

 

[JackHughs]

I have an older second-hand Jubilee valve that I was told had a flow restrictor installed. If I just "crack" the valve - 1/4 to 1/2 turn, it will stop flowing at approximately 3,000 psi. I then open the valve one or more turns and it will then flow up to the internal pressure.

The internal flow resrictor in your valve may be your culprit.

JaxkHughs

 

[steve-l]

In cases like this, I always suspect that a gauge is lying to you. Secondly, most all male foster fittings have a rubber plug in the center that provides a check valve function, just as an O ring does on probe fill ports. No springs are used. To prevent a check valve function on male foster fittings, simply punch out the rubber plug. It is also a really good idea to use more than one pressure gauge, as some do indicate false pressure readings. I use 3, one on the compressor, one on the fill whip and another on my bottle. It is cheap insurance. Gauges do fail and HPA can be very dangerous.. Perhaps the OP does not understand what a deadhead test is. All it is, is a fill attempt with the compressor against a tank with a closed valve watching the whip pressure gauge.