"TrapdorSpydr"I just watched your video (Ernest) on Cliff Allen's post. I will micrometer my reg to the dimensions you said on that recording. I have listened
to both you and Weatherby. And I was getting 915 fps readings on a 180 bar fill. If I quick fired the fps would go up to 925 by the fourth quick shot. If resting 15 seconds between shots less than 10 fps spread. Dropped off reg at 150 bar.
The day prior the knurling knob was turned in too tight I feel and the quick fire went from 907 fps to 711 within 3 quick shots. When I turned the knob out 1/4 turn I was getting 915 to 925 in 3 quick shots- way better. Here is the monkey wrench---- when I filled to 210 bar my fps was 812.4 10 sec
815.9 10 sec
820.8 10 sec
823.0 15 sec
827.9
When I would shoot fast, the fps went up to 866 within 4 quick shots.
As the pressure dropped in my tank the fps rose.
I was really happy with the 180 bar fill results to not waste air to determine the gun came off the reg at 150 +/- bar, but at the 210 bar fill the darn thing was low fps and not consistent.
I am still on this ride. Thanks to both you ffor the advice. I would be lost without your direction on where to start. Oh, yeah Cliff Allen is watching this I am sure.
Have you decreased the pressure on the belleville washers by loosening the lock nut a bit?
They don't need a lot of tension, the more tension you give it, the harder it is for the incoming air to overcome the spring tension to shut of the air flow. (air comes in, BV washers are compressed, regulator piston moves in towards the delrin seat, air flow is cut off)
The needed force generated by the belleville washers to shut off the airflow in the reg. at a certain output pressure will be the same.
When the BV washers are preloaded too much, your end force will be the same
but the piston travel will decrease. As a result of this the nozzle, which seals against the delrin valve seat, is already too close to the valve seat in a unpressurized situation.
In other words, the gap between valve seat and nozzle (piston stroke) will get very small (likely too small in your case), and is struggling to let the air flow into the plenum chamber in the breech.
I'm pretty confident that when you decrease the preload on the BV washers, and readjust the knurled piston assy until you reach the desired pressure, your issue will be history. Then, the piston can actually
move instead of creeping
And the good news is, as long as one uses his common sense, it is pretty unlikely you'll break something. However, it can be a real PITA to have it adjusted without a reg. tester, but as I read your story, I'm confident that you will have it sorted out
You're on the right track.