Can an air pressure regulator switch going bad cause water hammer? Everything seems to be fine...air tank is full, pressure cut-in and out around 25 and 50 p.s.i. Pump seems to cycle fine and no water leak(fixed that last year) Other than the water hammer everything seems fine. The water hammer occurs when water is running and cycleing and cut-out at 50 p.s.i. Does NOT occur when you turn water off. Thanks for any input.