[E.M.P fields]

I have a 4500psi bulk tank that for some reason will not fill. It is possible to get it to slowly fill if you start with 0 pressure and slow try to equalize it to another thank. But if you fill to quick you hear a click and it stops. If you have the cascade system pressurized the tank will not fill. I let the two tanks try to equalize for about 10 minuntes and the tank with the issue only had 300 psi in it. The tank has a cga 680 vavle on it, if that makes a difference.

[skbcnb]

I would think the only thing that could be wrong with it is the valve. I would rebuild or replace.

[TargetIndy]

Sounds like the valve may need to be replaced.

[E.M.P fields]

Is that something that I need to take to some one, or is this something easy to do.

[TargetIndy]

It requires quite a bit of torque to properly install the valve. Take it in to your local company that does hydrotesting. They should have the equipment to properly install the valve.

[jba_Baller]

once the valve is replaced youl be fine

[Trips]

It is the valve...and no you can't do it your self. Basically from the sound the the seat is bad in the valve, it happens often on Sherwood valves. one way to prevent it from happening again is to not over tighten the valve when closing or forcing it past the open position when opening.
Definately take to your local hydro testing facility where they have the proper tools, and replacement parts.

[rcontrera]

The seat on those valves can come loose if you are torquing it shut. By cranking it down hard, the delrin seat can spread the crimping around it and allow air to get in behind and push it closed.

Once you empty the tank, replacing the seat is EASY. But the key here is to MAKE SURE THE TANK IS EMPTY!!! You can do that by opening the valve and pulling the safety valve.