"Mechanical seal" is also known as "mechanical seal". Such as centrifugal pumps, centrifuges, reactors and compressors. Since the drive shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment. The medium leaks out through this gap. If the pressure in the equipment is lower than the atmospheric pressure, the air leaks into the equipment, so there must be a shaft seal device to prevent leakage. There are many types of Silicon Carbide Stationary Seat, because the mechanical seal has less leakage and long life Therefore, the mechanical seal is the most important shaft sealing method in these devices in the world today. The mechanical seal is also called the end face seal, which is defined in the relevant national standards as follows: "At least one pair of end faces perpendicular to the axis of rotation in the fluid The pressure and compensation mechanism elastic force (or magnetic force) and the cooperation of auxiliary seals keep fit and relative sliding to prevent fluid leakage.