It has a mechanical seal rotary axis perpendicular to the face, the fluid pressure and mechanical action in the face of the external elastic compensation, dependence of the two sides in the second sealed the other end in order to maintain health and sliding, to prevent fluid leakage.

Universal periodic leak: large axial movement of the rotor pump, auxiliary shaft seal and a lot of interference, flexible ring can not move the axis. At the scene, turning the pump switch, dynamic and static ring wear, not compensated displacement. Solution: In the assembly of mechanical seals, shaft axial movement should be less than 0.1 mm, the auxiliary shaft seal and the amount of interference, while maintaining the radial seal ring shaft after assembly to ensure that mobile and flexible.

Sealing surface by the friction caused by insufficient lubrication sealing surface. Solution: oil lubricant oil chamber height should be higher than the dynamic and static high-ring sealing surface. Periodic vibration of the stator and rotor cap or not because the upper and lower impeller and shaft unbalance, cavitation, or bearing damage. Leakage due to pressure generated by high pressure and the mechanical seal leakage caused by pressure waves.

As the pressure of spring pressure than the design is too large, sealed chamber over 3Mpa when the sealing surface than the pressure is too large, difficult to form the seal of serious films, more heat, causing thermal deformation of the sealing surface. Solution: In the mechanical seal assembly, in accordance with the provisions of the spring compression must not allow too large or too small. In the high-pressure mechanical seals should be taken to face the force is reasonable, can be cemented carbide, ceramics and other materials, high compressive strength, enhance the lubricating and cooling measures. Operation caused by the vacuum pump mechanical seal leakage start and stop the process, the pump inlet blockage and other reasons, there may be a negative pressure of the sealed chamber, resulting in the sealing surface of dry friction. Solution: double mechanical seal, which helps to improve the lubrication conditions, improve sealing performance.

Secondary particles, sealed surface impurities seal failure; as a weak acid, weak base erosion, loss of normal function of the media dynamic and static secondary seal ring. Strategy: to ensure coverage in the oil chamber clean, dirty, Congress banned oil, mechanical oil seal oil chamber line should be higher than the sealing surface; selected according to different media and different structure of mechanical seal, such as the corrosive media, rubber seals should be used in high temperature resistance, weak acid, weak base, fluorine rubber, solid particles in the tungsten carbide tungsten carbide mechanical seal friction and easily accessible location choice.