Mechanical ventilation is widely used in intensive care units and during surgeries on patients who are fully sedated and unable to maintain spontaneous breathing. The ventilator utilizes a system of valves to control the flow sent to the patient, a flow and pressure sensor to determine the system’s states and provide feedback to the valve controller, and an electronic system that commands the valves. This work focuses on the development of controllers and systems necessary for the correct activation of inspiratory and expiratory pinch valves. The two valves are composed of a stepper motor and a cam mechanism. The ventilator was tested with the models and settings proposed in ISO 80601. In controlled volume mode the volume error remains below 7%, while in pressure mode the pressure error was kept below 5%. Part of the errors are due to the pressure adjustment upstream of the inspiratory valve. The expiratory valve maintained the desired end-expiratory pressure, but the stepper motor frequently lost steps. With the tests carried out, the controllers seem adequate, but the system still needs adjustments.