Beeman QB Chief .22 broke down

[hotspot]

These measurements are for the Beeman Chief, not the Chief ll.

[CableStop]

Both poppets are done, I'll PM you guys for your shipping addresses.

I remade the first one so they both have squared off spring seats now.

[BigBird]

I dont think 90° corners will hurt especially dealing with 2kpsi.  Along the same lines from a different angle, a 45 degree face will be as strong as a flat face and probably flow better.  I've used delrin up to 7200 psi in testing and not have any extrusion.  Nice way to set a poppet.  Of course you have to make the od bigger than the throat. On my .37 I have a .250 throat and .356 poppet so this one could have even less restriction.
Here is a peek one that seals on its od.

[wll2506]

I dont think 90° corners will hurt especially dealing with 2kpsi.  Along the same lines from a different angle, a 45 degree face will be as strong as a flat face and probably flow better.  I've used delrin up to 7200 psi in testing and not have any extrusion.  Nice way to set a poppet.  Of course you have to make the od bigger than the throat. On my .37 I have a .250 throat and .356 poppet so this one could have even less restriction.
Here is a peek one that seals on its od.

That looks awesome, I really want to read on how it works, may work on a Chief II Plus but I don't know ?

wll

[BigBird]

I dont think 90° corners will hurt especially dealing with 2kpsi.  Along the same lines from a different angle, a 45 degree face will be as strong as a flat face and probably flow better.  I've used delrin up to 7200 psi in testing and not have any extrusion.  Nice way to set a poppet.  Of course you have to make the od bigger than the throat. On my .37 I have a .250 throat and .356 poppet so this one could have even less restriction.
Here is a peek one that seals on its od.

That looks awesome, I really want to read on how it works, may work on a Chief II Plus but I don't know ?

wll

This was not for a QB but for a larger .344 throat valve.  It worked ok.  For these 2kpsi guns or even the 3kpsi delrin is perfect. 

[CableStop]

In my opinion the only time you should use PEEK is when Delrin won't hold up, it's an amazing material but getting a good valve seal with it is a pain. 

I've always been worried if a tapered seat will clear the throat all the way, I would think it needs more lift than a flat seat.

Do you think a tapered seat would be better for a 2k PSI rifle, I forgot the original chief wasn't 3k.

[BigBird]

In my opinion the only time you should use PEEK is when Delrin won't hold up, it's an amazing material but getting a good valve seal with it is a pain. 

I've always been worried if a tapered seat will clear the throat all the way, I would think it needs more lift than a flat seat.

Do you think a tapered seat would be better for a 2k PSI rifle, I forgot the original chief wasn't 3k.

I don't have any evidence or knowledge on that.  I just look at aerodynamics.  Air going by a flat poppet has to go past two corners and maybe a "hump" where the tapered goes "almost" straight in.  They also look very sexy.   Also, with 2kpsi you can get a tapered one much smaller.  I think 20% is for 3kpsi so technically you could go smaller.  Again it could probably stand a lighter hammer and any power mods are probably going to lower shot count.

Bob would know about the best poppet design and probably has a chart that says otherwise. I also know there are air pillows (not the ones made by My Pillow Guy) formed with steps in the air path that may help to direct air efficiently sometimes.

[z_johnq]

Thanks Dan for the reminder.
Regards.

[CableStop]

Just an update, the poppets got sent out as of this afternoon, here's a comparison between the gen one and two for anyone interested.

[OTmachine]

Thanks for posting.
Poppets look Good!  I believe that the angled valve face would be a good design as long as there is enough material in the valve seat area to accommodate it.  My Chief is partially apart now.  Have not had enough time to work on it due to life, (Honey-doos, etc, .....).  Shortening the barrel to fix oversized lead-in, fixing the trigger, and will be making a new Delrin poppet.

[wll2506]

Just an update, the poppets got sent out as of this afternoon, here's a comparison between the gen one and two for anyone interested.

Thank you very much for the pics, I'm all ears on seeing how they work.

wll

[BigBird]

All this talk of disassembly of the chief should include a warning for replacement screws.  I was just reading my notes about pressure testing and came across chief screw failure.

I have not taken apart my chief yet but will be installing some 10-32 screws that should just involve tapping maybe with a taper then bottom tap.  You can get the good screws on the internet via several sources.

This test is just for the screws.  Tube not tested.  So don't over fill this thing even if you replace them.

https://www.gatewaytoairguns.org/GTA/index.php?topic=139379.0

[Douglas]

Hey guys how did the popits work in your chiefs. Just in case I might need one some day I would like to know if the dimensions are good. THANKS

[Douglas]

Hey guys, please let me know. 

[USAFANG6799]

Hey guys how did the popits work in your chiefs. Just in case I might need one some day I would like to know if the dimensions are good. THANKS

I'd like to know also. I have a Gen 1 that's been dormant for quite some time now.

[SADave]

Me as well. Good gun and so far no issues but better to be prepared.

[Marvin lee]

Hey guys I ordered the poppet and received it but it was the wrong one it was for the gen two i needed the poppet for the gen 1 any they corrected it and sent me the right one for the gen one.the gen two is 33mm and the gen one is 35mm.the problem I’m having now is the when I air up and let sit up over night the gun is empty of air when I check it,reason this is happening I think is ,I was not willing to set and let this beautiful gun sit so I put the poppet for the gen two in my gun and in order to make it shoot I sanded down the round block that sits behind the valve assembly so that it would make up for the short valve for the gen two,now since I got the correct poppet in  I think it’s letting are out,because it thinks the reservoir is empty to the point where it will bleed of the air.if anyone has a block that they have or can make to spec please let me know,Beeman.com is no help what so ever I must say.please help,this gun is definitely one of the greatest pcps I have ever owned,I got all of the cheap ones I must say ,as a Army veteran you get what you can afford and make it work,which I’m very good at,thanks guys and girls for your help,thanks Canada you have saved me for sure.