Working on a 30 ton water furnace heatpump (water to water) that had repeated high pressure trips and then fried the compressor. Took out the bi flow drier and found the check valves ,on both ends, blown out of the drier. The rivets that keeps the plates in place were gone and the flat piece of metal that makes up the check valve was lodged in a reducer fitting and looked like an arrow head as it was blown into the reducer. This was an Alco drier. I took to my supplier who checked it out with Alco and said they had seen the rivet let go before but never the plate. Just woundering have any of you guys seen this happen. Unit is less than 2 years old using R410a . Thinkl I will replace with a Sporlan.