sentences:  The valves are also removable if they are not working properly.The one-way endobronchial valve is typically implanted such that when a patient exhales, air is able to flow through the valve and out of the lung compartment that is fed by that airway, but when the patient inhales, the valve closes and blocks air from entering that lung compartment.Thus, an implanted endobronchial valve typically helps a lung compartment to empty itself of air.