I have two zone valves which flow a short distance to a pipe which elbows down to the B&G series 100 pump. The flow direction of the zone valves is towards the pump and the pump direction is flowing to the zone valves. Didn't make sense to me, so when I installed a new pump I directed the flow in the same direction of the zone valve. Now the pressure relief valve is leaking. I Shut the system dowm, but it still doesn't make sense that they should flow toward each other. HELP!!