A cervical therapy device for providing continuous passive motion to the head or neck of a patient includes a patient’s support such as a chair and an upwardly extending frame which extends upwardly above the chair. The valve cartridge comprises a generally cylindrical cartridge body, a bore extending longitudinally through the cartridge body, and an outlet passage and intermittent inlet passages extending through a side wall of the cartridge body to intersect the bore. In one embodiment, the short signal is obtained during a short time interval that is at the approximate middle of a long time interval such that the short and long intervals share a common median time value. During the recrystallization, the channel region having crystallinity functions as crystalline nuclei.