Low-pressure valve

The invention relates generally to fluid delivery systems requiring precise quantities of fluid to be metered cyclically, and more specifically to portable ventilators having automated monitoring and regulation. A low-pressure valve enabling precise control of a fluid flow rate through the valve during cyclical operation of the valve. The valve is useful for controlling air delivery to a patient as part of a portable ventilator. The valve comprises a housing having an inlet and two outlets and . A wiper plate and an orifice plate are disposed inside of the housing. Transverse movement of the wiper plate relative to the orifice plate , powered for example by a servomotor , simultaneously and alternatively covers and uncovers various openings in the orifice plate . The total flow through the valve is thereby divided between the two outlets and