discovery valve

[ped]

can anyone explain why the discovery valve front section is longer than a 22xx one
ped

[bgmcgee]

because that's the way it's made. sorry ped couldn't pass that up I have no other idea otherwise.

[ped]

  good answer bg
ped

[breakfastchef]

Let me guess too...

1) More interior valve volume
2) More surface for external o-rings

[gdm620]

My guess is so it will clear the front grip frame hole.  The o-rings would have to be in front of that so it wouldn't leak.  Thats the way it look to me.

[quickster47 †]

My guess is so it will clear the front grip frame hole.  The o-rings would have to be in front of that so it wouldn't leak.

That would be the reason. 

Carl

[ped]

cheers for the replies just re read my question and realized i put the front when i should have put the rear section where the exhaust port is
ped

[gdm620]

I'm really guessing on this one but I think the case might be longer to help seal the valve stem in the back when the hammer hits it to release the air.  More surface around the stem.  The end of the stem is in the same spot as a regular valve but the case extends back.  The disco works with more pressure then a co2 gun so more is needed to seal the stem.  Just guessing though.

[ped]

it's certainly a possibility and along the lines of what i thought which is that the valve stem is hit harder with the stronger spring and the longer valve body is to stop the valve stem being forced sideways
ped

[tinker]

I think the rear of the valve is larger to hold more air within the valve itself.  CO2 expands and HPA is compressed air. When you make the system more efficient (HPA) there is a pressure wave generated in the air tube which causes pinging when fired. The Disco gauge block is an attempt to keep pinging to a minimal by having a small 1/8" hole. That's why the stock Prod pings a bit and the Disco doesn't.  The Prod gauge block has a 5/16" hole!
  By enlarging the internal space in the valve there is theoretically more air available at the valve for when it opens.  That's why one cuts the threads off the front of valve to open the inside for more volume.  Works for both HPA and CO2.  Odd one would think the pressure in the tube would be constant throughout the shot cycle but it's not, CO2 and HPA are very different from each other.

Glen

[1377x]

I have been seeing 2 piece valves in discos lately
one piece covers the frame screw hole then the other little piece seats the stem pretty cool the tube then becomes the valve body on one app there was no valve spring used,just the pressure in the tube holds the valve shut
the same style of valve with minimal spring pressure on the stem to keep it shut
I want a valve like that. it is custom and will have my disco pushing over 100fpe

[quickster47 †]

I have been seeing 2 piece valves in discos lately
one piece covers the frame screw hole then the other little piece seats the stem pretty cool the tube then becomes the valve body on one app there was no valve spring used,just the pressure in the tube holds the valve shut
the same style of valve with minimal spring pressure on the stem to keep it shut
I want a valve like that. it is custom and will have my disco pushing over 100fpe

Can you give us a link to that valve technique?  Would like to see it since I've made several poppet valves for the 22XX guns.

Carl

[mr007s]

I have been seeing 2 piece valves in discos lately
one piece covers the frame screw hole then the other little piece seats the stem pretty cool the tube then becomes the valve body on one app there was no valve spring used,just the pressure in the tube holds the valve shut
the same style of valve with minimal spring pressure on the stem to keep it shut
I want a valve like that. it is custom and will have my disco pushing over 100fpe

I also woold like a link to more info about this valve. Always searching for mods to increase the power for "Stone Cold"
In your expert opinion Ed, would a Custom Valve of this type be of benifit in a gun regulated to run off of 2000 psi? Curious if I should dwell deep into this!

[eric]

ditto to the 2 above statements

[1377x]

Can you give us a link to that valve technique?  Would like to see it since I've made several poppet valves for the 22XX guns.

Carl

its something Lloyd sikes made and/or rsterne made which threads they are in idk a search of gta should find it