proportional flow control valve a proportional flow control valve comprises a valve body (1) and a valve coil. the valve coil is disposed under the valve body (1), a valve cover plate (2) is disposed at an upper end of the valve coil, the end of the valve cover plate (2) is connected to a upper end of a connector rod (3), a bobbin rack (4) is fixedly mounted to a lower end of the connector rod (3), the bobbin rack (4) is wound by an enameled wire (5), the wire Enameled (5) is connected to a power supply device, a magnetic core (6) and a magnetic ring (7) arranged under the coil frame (4), the magnetic ring (7) surrounds the magnetic core (6) , an opening is maintained between the magnetic ring (7) and the magnetic core (6) to form a magnetic field, the coil frame (4) is jacketed on the magnetic core (6) and is disposed in the opening between the magnetic core ( 6) and the magnetic ring (7). After power is applied to the enameled wire located in the magnetic field, a generated electromagnetic force drives the connector stem (3) and valve cover plate (2) to move axially, thereby controlling the opening and closing of a valve orifice. The valve is applicable to a breathing machine with a low-pressure drive air supply, so that when the pressure of the drive air supply is low, the air flow required by normal operation of the breathing machine can be assured. The valve also has advantages such as simple structure, high response speed and long service life.válvula proporcional de controle de fluxo uma válvula proporcional de controle de fluxo compreende um corpo de válvula (1) e uma bobina de válvula. a bobina de válvula fica disposta sob o corpo de válvula (1), uma placa de cobertura de válvula (2) fica disposta em uma extremidade superior da bobina de válvula, o findo da placa de cobertura de válvula (2) é conectado a uma extremidade superior de uma haste conectora (3), um bastidor de bobina (4) é fixamente montado em uma extremidade inferior da haste conectora (3), o ba
