Am a mechanical engineer specializing in large chilled and condenser water cooled AC systems in high rises. I have seen them, but for the life of me cannot find a manufacturer of an open atmospheric expansion tank or reservoir with float-valve for placement at the top of a large system. I have...
Suffering extreme noise when closing a 2" ball valve in clean water - 12 psi differential and approximately 15 psig static at the valve inlet. Crazy, it only make noise closing, not opening. So I replaced it with another brand of ball valve (Griswold Soft-touch) - no difference!
The flow is...
