Thanks for the response. Am I correct in thinking the split valve was caused by me reducing the flow and there by increasing the velocity past the safe limits. This particular system has 98 static and is constantly splitting heads (rotors and sprays) at the threads. I cannot get the management to authorize a regulator, I just keep replacing heads every month or so. What makes things worse now, is the duty cycle has increased due to cycle soak programming (we have water restrictions). So I'm afraid that the time between replacements due to failure will be shorter now due to the three start program. That's why I did that to the DCV, trying anything to slow the constant head failure. I guess I don't understand the difference between slowing the flow in a flow control valve and partially closing a ball valve. I'm really just trying to do the best thing for my customers, but I don't want to cause more trouble by doing the wrong thing. If closing a ball valve is the wrong approach I need to know. I'll need facts so I can sell them on the idea that what they are doing is not the way to handle this excessive pressure. Sorry to be so thick about this, I'm trying to understand what is really happening in this case. Any help is appreciated.