why would you want a "degassing tool" ????

[spysir]

when nearly (not quite all but they are rare) all pcpc guns can be degassed simply by filling untill the check valve opens, closing your air supply then SLOWLY turning the bleed valve on your fill yoke.
 KISS

 John

[HNT5]

What if your using a hand pump? Opening the bleed valve does not de-gas the gun. It only releases the air in the hose so you can remove the fitting.

Nathan

[spysir]

at least it works with my FX hand pump, just bairly , slowly open the bleed valve untill the smallest amount of air starts to come out, it will take a minute or two but it does work.

 John

[HNT5]

That would not completely de-gas it as the one way valve has spring/ air tension to hold it closed. The primary force holding the valve closed is the air pressure in the resevior side (example 2000 psi). You must over come that pressure (at least 2001 psi) to open the valve and then begin filling. When you stop pumping the pressure is equal and the valve is closed. When you pump, there is a little bit  more pressure on the hose side, and it goes in the resevoir, then the valve closes again, pressure equalling out again. That equal pressure is what helps keeps your fill plug from popping out under pressure. When you open the bleed valve, you lower the pressure on the hose side, by increasing the volume (as the system is no longer closed). Once the pressure is lower on the hose side, the valve will not open and de-gas. That takes the pressure off the fill plug and now it can be removed quite easily.   Otherwise your gun would empty everytime you tried to fill it, regardless of the method (hand pump or tank) you used.  Degassing tools overcome this by mechanically holding open the valve and allowing all the air/CO2 to escape.

Nathan

[spysir]

just post? Give it a shot it does work. You are correct in that you need to overcome the fill pressure (if it already has 2000psi you will need to go to say 2100psi) then bleed slowly, it does work on a Disco, a Career 707 , a DAQ a Bam50 , others (not AA , the AA actually has a spring in there, most dont).
 Give it a try (slowly JUST crack the bleed open & leave untill empty) it will work, I personally have done this to all the above mentione rifles.

 John

[HNT5]

I didn't try yet, but I have an AA and a Logun so it may not work there. Those other rifles I cannot speak to as I have never filled them.

Nathan

[ray1377]

He's right, I found this out by mistake the other night when I had filled my disco to 2000 psi and then didn't want to wake my wife napping on the couch so I just barely opened the bleed valve so it wouldn't make that loud hissing sound. Well I noticed it seemed to take forever for the thing to stop hissing and when I got tired of waiting for it to stop I quickly opened the valve and then I noticed the gun only had about 1200 psi in it. So yes, if you let the pump bleed screw out slowly it will degas the gun.
Thanks Ray

[shel67]

I'm gonna try this tomorrow on my Disco! If this works, I'll shave off the shaft of the degasser and use the rest as my power adjusting knob. Thanx guys.

[spysir]

Did you give it a try? Folks who dont know me may want to know if it works?

 John

[shel67]

Yes John it does work. After pimping up to 2000 ps I then backed off the bleed screw very slightly and could hear a slight hiss. I waited for about 3-4  minutes and found that the air continued to come out. I imagine that if I had left it it all may have come out. (I let it go from 2000 to about 1500). No need for a degassing tool now so now I've got a really nice power adjuster tool! By the way, the pump must be pressured up to coincide with the pressure on the rifle for this to work.
-Shel

[spysir]

and posting. Yes you do need to match/excede the pressure in the tube first but it works on most all pcp's(not all but most). My FX pump would take a good while but when using my scuba yoke I can bleed 2000psi in under 120 seconds.
 I have been shooting pcps for a good long while and simply thought most everyone knew aboout this (twas a boo boo when I did it the first time years ago, doesnt everyone have boo boo's ) then the other day just as we were heading out hunting Squirrels my friend said "darn" as he had overfilled his 2260/Disco, not to an unsafe level but enough to mess up his poa/poi and I leaned over and bleed it off for him then  he said "I just learned something" which is what made me post it here.
 I am sure the "de-GAS" thing is a thoughtfull co2 chilling prior to filling idea (but I "think" my way would chill it also?) to get a good bulk fill ? But it seems a good number of Disco owners use air AND want an easy preload adjuster so skip the de-gas idea and it gets very easy to make a pre-load screw cheap.
 Picture of said 2260/Disco by MikeT:


 Happy shooting,

 John

[shel67]

Hey no problem. It's nice to learn these little tricks. By the way, thats a sweet piece of work there!
-Shel