Tyco Dry valves continue to trip

Good Evening,

I am perplexed with a problem we are having with our dry suppression system. the system has six zones, 3 4" globe, a 4" victaulic, and 2 6" Tyco DPV 1. The system water pressure is maintained by a jockey pump between 135-235psi. The jockey pump cuts in at 134 psi and out at 145 psi. When the pump cycles on it runs the pressure up to not greater than 235psi. The system has been fairly stable over the 4 years I have owned the facility. The jockey pump and the remainder of the system has not changed in design over the last 10+ years.

Recently a contractor conducted our fire pump test. Over the next 12 days the two 6" tyco valves have tripped repeatedly. Air pressure on these valves is 68psi per the spec book. Water pressure is not greater than 235 psi.

The contractor has suggested we replace the jockey pump with a smaller jockey pump in the hopes that the pressure will not build as high when it cycles. While I agree the 235 psi pressure is extreme for a cutout of 145 psi the settings have not been changed over the 4 years I have had the facility and this has not been a problem.

I have had the contractor reset the valves and I have reset them myself with the same result. I have studied the spec book on the valves and our resetting procedure appears to be in line with manufacturers requirements. One zone has an accelerator but we have isolated it in our troubleshooting efforts.

Is there anything I should inspect or try before hitting it with my wallet? We maintain the suppression system with an open checkbook, however, I am suspicious of the jockey pump diagnosis considering that the system has been in place for over 10 years without this issue.