Pressure regulating valve is a key equipment for flow field regulation in wind tunnels. Based on the special pressure regulation characteristics of 1m level half-closed layout blowdown Intermittent wind tunnel and wind tunnel performance indicators, the design and development of pressure regulating valves are carried out. A detailed study was conducted on the wind tunnel pressure regulating valve from the aspects of aerodynamic scheme design, theoretical analysis and calculation, structural design, etc., in order to achieve the advanced index requirements of the national military standard for the wind tunnel flow field.