I have exactly the same valve, I think. Went to local Ewing's here in Chandler, AZ and they sold me two R1359s. I was having trouble with the valve turning on (solenoids are OK). After replacing the diaphragm, everything worked OK for a while, but then I noticed the sprinklers were weeping, so I cranked off the screws and checked for debris, etc. All looked good but after re-assembling the weeping was worse. I swapped out the new diaphagm with the one that had never been used, and the sprinklers are still not turning off all the way, major weeping problem. It seems as if the diaphragm is just a hair too large for the receiver piece in the valve. Could that be? The valve also groans when it's on.
Any ideas gratefully received! Thanks.