Things that would make your burst disc blow
1- A restriction in your output hose or one of the fittings.
2- The purge valve has been over-tightened and the plastic washer beneath it crushed.
Low or no air volume problem, with or without pressure, usually a leak although it could be either of the above two problems as well. I have ordered these in the most likely to happen order.
1- Leak at the foster fitting o-rings.
2- Leak at the filter o-ring or dowty seal.
3- Leak at the top of the second stage head fitting dowty seal under the fitting.
4- Leak at the stainless high pressure line seal, top of the head.
5- Leak at the high pressure line at the block near the check valve. Could be the line or the Dowty seal under the fitting.
6- Leak at the check valve
7- Leak at the o-ring for the second stage head cylinder to head connection.
8- Rings on second stage piston are leaking.
My number two Yong Heng quit building pressure within two months of my receipt of it. I found the second stage piston in pieces when I tore it down. Poor QC someone did not put the locktight on the top part of the piston, which is threaded on, so it unscrewed and destroyed itself. A $12 part and an hours worth of werq and it was good as new. You have to expect his kind of thing from anything made in China.
