Air Venturi Avenge X Fill Nipple Issue

[scotton]

So in my never ending quest to get my Avenge X to stop leaking, I just replaced the o-ring on the fill nipple (part 127). While doing so, the check valve (part 125 in the image, referred to as the Non-Return Valve Screw) fell out of the end cap. I dropped the check valve back into the cap and screwed the fill nipple back on. When I went to air it up, the check valve isn't checking. In other words, when you open the bleed screw on the big tank, all of the air in the rifle tank comes out and then you have an empty gun.

What am I doing wrong? Is part 125 supposed to fit inside part 127? Cause it sure doesn't want to fit in there. As near as I can tell, the flat screw head on part 125 is lying flat inside the tank cap when I start screwing in the fill nipple.

A little guidance would be appreciated.

Ok, I just took it apart again and without the check valve, the fill nipple screws down to the threads. With the check valve, the fill nipple doesn't screw down as far. Am I supposed to be seating the check valve in the tank cap (part 124) somehow? It seems like there should be a tiny gap between the fill nipple and the check valve so that air can come in and not go out, so I think I must not have the check valve seated properly. I'll wait for clarification before I start banging on things.

Anyway, looking forward to some edumacation.

 

[nervoustrig]

It looks like a pretty typical check valve arrangement, and your understanding regarding leaving a small gap for it to cycle open and closed is correct.

A few possible causes come to mind.

• The check valve has too much room and is tipping and binding. The stem is responsible for keeping it in line with the Foster fitting, but it looks very short so spacing is perhaps more sensitive than check valves with a longer stem.
• There is a scratch or defect. Using magnification, carefully inspect the two sealing surfaces: the end of the Foster fitting (127) and the underside of the screw head (125)
• Any chance it’s the O-ring #129 on the body of the Foster that is leaking instead? Or is it definitely blowing air back out through the center via the sintered filter? Scratched this one...it would be leaking while filling.

 

[Freddy J]

I'd just purchase several replacement Fill probes o use as backups. just be sure you get the proper size. they are way cheaper than freight. Always place a drop of silicone oil on the fill probe when you refill the air supply.

 

[scotton]

• Any chance it’s the O-ring #129 on the body of the Foster that is leaking instead? Or is it definitely blowing air back out through the center via the sintered filter? Scratched this one...it would be leaking while filling.

Yeah, this is what it was doing so I replaced o-ring 129. One door opens and another closes (or something like that)

 

[scotton]

Something is definitely broken. The check valve screw is super loose in the cap, I don't see how it would possibly seal. So I need a check valve, possibly a fill probe and maybe an end cap.
I sat on hold with Air Venturi for 10 minutes while I found the parts on PA, so I just hung up and ordered a new probe, check valve and end cap.