I have several Irritrol 700-1 that are 20+ years old, two have stopped working and symptoms indicate that the diaphragm is leaking. I purchased two seal kits plus a new valve and am having some difficulty. The diaphragm seems too large for the valve base. There is a ridge around the edge of the diaphragm where it should fit into the groove of the base, but no matter how I try, it won't stay long enough to be able to reassemble the bonnet. After "playing" for almost an hour, I removed the bonnet of the new valve and discovered the same issue. I assume that Irritrol has a technique they use to assemble at the factory. I called Irritrol and was told to use some water to lubricate the diaphragm. It was obvious that the tech I spoke to had never seen the inside of a 700.
Has anyone repaired a 700 and what was the secret? I have tried most every 4 letter word I can think of.
Fred