Device for testing sealing performance and sealing specific pressure of valve ball and valve seat

The utility model relates to a valve ball and valve seat sealing performance and sealing specific pressure testing device which comprises a mounting rack, the mounting rack is sequentially connected with a hydraulic cylinder, a pressure sensor and a supporting mechanism from top to bottom, a liquid storage cylinder is arranged outside the supporting mechanism, liquid is arranged in the liquid storage cylinder, the supporting mechanism comprises a blind plate, a spring and a guide cylinder, and the blind plate is connected with the pressure sensor. The blind plate is connected to the mounting frame in a sliding mode through the guide cylinder, the spring is arranged between the blind plate and the mounting frame, the blind plate is provided with an air hole, the two sides of the air hole are provided with annular grooves used for fixing the valve seat, and the blind plate is provided with an air source pipe communicated with the air hole. The utility model aims to control the pressure value between the valve b