RP TROUBLE SHOOTING GUIDE
with Relief Valve dripping or flowing
1st STEP Close second Shut-Off Valve. If discharge stops, fouling of second check most likely with backpressure in the system.
2nd STEP If discharge continues, fully open #4 test cock. If discharge stops, or slows, most likely problem is with the first check.
3rd STEP If discharge continues, or gets worse while #4 test cock is flowing, most likely it is the relief valve.
IF RP IS SPITTING, IT IS MOST LIKELY DOING ITS JOB!
Address the cause of line spikes, either supply or down stream.