② The liquid medium vaporizes and expands, so that the two ends are separated by the vaporization and expansion force. When the two sealing surfaces are firmly attached, the lubricating film is destroyed and the end surface is overheated.
③The liquid medium has poor lubricity, and the operating pressure is overloaded, and the tracking and rotation of the two sealing surfaces are not synchronized. For example, the high-speed pump speed is 20445r/min, the center diameter of the sealing surface is 7cm, and the linear speed of Centrifugal Pumps is as high as 75 m/s after operation. When a sealing surface lags behind and cannot track the rotation, the instantaneous high temperature causes the sealing surface to be damaged.
④ The orifice plate or filter screen of the sealing flushing fluid is blocked, resulting in insufficient water volume and failure of the mechanical seal.
