Fecha de publicación: 27/09/2022 Fuente: WIPO Wine The invention provides a constant pressure valve structure which comprises a constant pressure valve body, a first cavity and a second cavity which are communicated with each other are formed in the constant pressure valve body, a first pressure reducing valve and a second pressure reducing valve are arranged in the first cavity and the second cavity respectively, and a control valve is further arranged on the communication portion between the two cavities. Each of the first pressure reducing valve and the second pressure reducing valve comprises a piston, a piston seat and a pressure spring arranged between the piston and the piston seat, the two piston seats are respectively fixed at two port parts of the constant pressure valve body, and the two pistons are symmetrically arranged relative to the control valve and are respectively provided with an air outlet channel communicated with two ends of the control valve. Through two-stage pressure reduction, the gas inlet pressure can be changed from high pressure to medium pressure and then to low pressure, the gas inlet pressure generated by the high-pressure gas cylinder is effectively split, the pressure of the gas outlet of the terminal is more stable and uniform than the pressure of the outlet of the first-stage pressure reducing valve, and therefore the gas filling wine taking speed is more stable and reliable.