Abstract: The generalized pulse code module (GPCM) control valve is a type of combination valve, and each flow control unit is connected together by mono-block. To precisely control output flow rate of GPCM valve, it is essential to study the characteristic of fluid in flow path of integral block. The relation between pressure and flow rate in GPCM control valve is studied, and the numerical simulation is carried out. The regularity about pressure distribution and unit flow rate of GPCM valve is achieved. It is useful to optimize the structure of GPCM valve, and make the GPCM valve has precision for flow control.

Key words: Flow path, GPCM control valve, Simulation