Degassing a regulated pcp rifle

[Taso1000]

Hi All,

I have been degassing my regulated rifle, B51, from the foster fitting by pumping till the check valve pops open and slowly opening the relief valve.

I did notice regulator weirdness and thought maybe the remaining pressure on the low side of the regulator would blow back towards the high side?

I was doing something else weird around the same time.  I was tuning the rifle and instead of putting a wire loop on the end to remove the regulator to adjust I was blowing it out with my garage air compressor at around 100 psi.

Besides the regulating weirdness, the last time I had the regulator out, the small oring towards the high pressure side was out of position.

So I'm wondering if the compressor or the output side imbalance pushed the oring out of position?

I know the easy answer is not degass from the fill side but push the valve open from the hammer side and to remove the regulator with a wire loop.

Any thoughts?

Thank you All in advance for your help!

Taso

[Motorhead]

On the Milo regs ... the HP bearing down on the small end of spool keeps the o-ring at the bottom.  If the pressure is greater within the plenum space over the HP storage space the o-ring will indeed shift and be forced upward towards the seat end of spool.

[Taso1000]

Thank you Scott.  I'm going to have to make a degassing tool to push the valve open from the rear cap.

Taso

[rsterne]

Regulators are NOT generally designed to have more pressure on the output end than on the input end.... At the very minimum that will push the piston in, and put unnatural pressure on the HP seat, which let's face it, is the heart of any regulator.... If that is damaged, the regulator will either leak, or be inconsistent.... IMO, regulated guns should be drained by shooting until you get to the point you can push the hammer down to open the valve and vent the remaining air out the barrel.... If you can, make a degassing tool, like in the Disco, that you can screw in from the back to push on the hammer.... Don't forget to pull the trigger first, of course, or you could damage things....

You may have found your problem, Taso....

Bob