The pneumatic film single seat regulating valve adopts the top guide structure, the valve body is compact, the fluid channel is S streamline, the pressure drop loss is small and the small current is large, the adjustable range is wide, the flow characteristic precision is high. Guide area is large, the guiding parts of valve core has the characteristics of strong vibration resistance, shutoff performance in accordance with gb / 4213-92 standard, the regulator with more spring loaded diaphragm actuator, with small output force big structure, more suitable for the high reliability and closing performance requirements high temperature, low temperature and pressure difference before and after the valve not situations.