Check valve suggestion

Flapper checks are not good. You want a metal, spring loaded, poppet style check valve. However, any check valve will fail when it is slamming closed every time the pump cycles off. Adding a Cycle Stop Valve to your pump will not only stop the check valve from slamming, but will give you strong constant pressure in the shower instead of cycling the pump on/off repeatedly, which also makes the pressure go up and down repeatedly. The CSV will not only make check valves last longer, but also the tank bladder, the pressure switch, and most especially the pump/motor.

 

Stainless or bronze single poppet. You don't need silicon bronze or double check.

 

There really is no good bronze anymore. When the government made us take the lead out of brass, it is now mostly copper and will flake off big green chunks like the Statue of Liberty. It also makes low lead brass more expensive, so now usually you can get Stainless for the same price or less. Stainless is not better than good old bronze, but is better than the low lead brass stuff we are stuck with.