When you turn on the water the valve hammers if you go all the way to hot or cold and turn back real slow to warm it does not hammer a hammer arrestor won't work because it's a manabloc if I adjust the water pressure it still does it the lower- the pressure the less sensivtive the hammering is- If I have 1 or 2 or 3 showers going they still hammer- I believe this is pressure balance problem does any know how to remove the balancing valve in a moentrol? Or the manabloc?

Typical water hammer happens when you shut off the water. You must have a vibration. Your Manabloc could actually part of the problem.