Aiming at a series of problems such as difficulty in fault identification and fault feature extraction of distribution valve spring of emulsion pump,a method for fault feature extraction of distribution valve spring of emulsion pump was proposed based on vibration intensity.The simulation model of the emulsion pump was built based on AMESim software.By setting different parameters respectively to simulate the failure forms of suction and discharge valve spring,the outlet pressure signals under normal and suction and discharge valve spring failure state were obtained.According to the vibration intensity theory,the outlet pressure signals were converted into acceleration signals,and the intensity characteristic factors of the outlet pressure signals were extracted and compared in the frequency domain.The results show that the influence rules on the outlet pressure intensity characteristic value are different when the suction and discharge valves fail respectively.With the deepening of the fault degree of the suction valve spring,the characteristic value of the outlet pressure intensity increases from the normal 15.82 mm/s2 to 20.58 mm/s2,28.18 mm/s2,34.85 mm/s2,and it reaches its maximum value at fracture; with the deepening of the fault degree of the discharge valve spring,the characteristic value of outlet pressure intensity decreases from the normal 15.82 mm/s2 to 15.77 mm/s2,14.88 mm/s2,9.28 mm/s2,and it reaches its minimum value at fracture.The results provide a theoretical basis for the subsequent fault diagnosis of emulsion pump.