Method for mechanical seal of centrifugal pump of exchange pipe:

    1 install the left part first; fit on the sealing plate.

    2 and then installed beside the ring, ring and static ring sealing surface should be clean and then put 3 flat key and impeller. Good gasket and nut. Mechanical seal installation, you must carefully check the assembled sealing parts number is enough, whether there is any damage to the components, especially dynamic and static ring bumps, cracks and deformation defects. If there is a problem, need to repair or replace the new spare parts.

    Check the sleeve or gland chamfer is appropriate, if not meet the requirements must be repaired.

    Mechanical seal components and assembly contact surface must be cleaned with acetone or ethanol before installation. The installation process should be kept clean, especially the dynamic, static ring and auxiliary seal components should be free of impurities, dust. The surface of the dynamic and static ring is coated with a layer of clean oil or turbine oil.

Tighten the gland should be looking for in coupling. Bolts shall be tightened evenly and prevent the gland section oblique, with feeler gauge or the special tool to check the points, the error is not more than 0.05 mm.

    Check the gland and the shaft or shaft diameter clearance (and concentricity) must ensure evenly all the way round, with a feeler to check the status of the poor is not more than 0.10 mm.

    Spring compression amount should be according to the provisions of, does not allow too large or too small, requirements of error of plus or minus 2.00 mm and increases the section pressure, acceleration section of wear. Is too small will cause less than the pressure and not to seal, spring loaded in the seat of the spring to move flexibly. When using a single spring, we should pay attention to the rotation of the spring, and the rotation direction of the spring should be opposite to the rotation direction of the shaft.

    After the moving ring is installed, it is flexible to move, and the dynamic ring is pressed to the spring.

    The static ring sealing ring in static ring back, and then into the sealing end cover. Pay attention to the protection of static ring section, ensure the static ring section and the end cover of the verticality of the center line and the static ring back anti rotary slot alignment anti rotation pin, but do not make contact with each other.

    When the installation process must not be allowed to use tools directly tap sealing element, need to beat the must be using special tool to beat, to prevent the sealing element damage

    When assembled all the seals should be coated with soap and water as lubricant, which can avoid damage during assembly and aprons. Between the sealing surface of the dynamic and static ring is coated with grease to prevent the dynamic and static ring sealing cover in front of the pump.

    Assembly of the floating ring, must be careful not to touch down floating ring spring, so as not to spring when knocked down influence the performance of the floating ring floating. After the floating ring assembly, you can gently press the floating ring to determine if there is a good floating performance.

    Install seal should be handled with care, to prevent damage to seals, the installation should be sealed and the cavity will be clean.

    Fastening mechanical seal gland should be uniform when the bolt fastening force, prevent the uneven stress damage the mechanical seal. For fast loading mechanical seals in whole after assembly must not forget the positioning sheet radial mobile road from the position of the shaft fixed.

    For mechanical seal seal of the medium is different, different temperature of cold water and hot water, sealing medium is corrosive, chamber pressures are different mechanical seal design will be different, maintenance process will vary.

    Mechanical seal inspection process summed up some experience: mechanical seal to be assembled, cleaning and inspection do not forget. First look at the two ring to see the shaft, the wound crack do not leak. Finally, in the ring, the pore diameter to see. A variety of sizes to be measured, two ring clearance to be adjusted. Must check the tight force, a small spring is the key. Bolt force should be uniform, gently with good habits.

    Mechanical seal of water pump is rotating machine body is sealed one of the most effective way, the machining accuracy is relatively high, especially the dynamic and static ring, if the method of assembly and disassembly of inappropriate or improper use, after the assembly of mechanical seal not only reach the sealing purpose and will damage the sealing element in the assembly.

    Attention to mechanical seal removal of pipeline centrifugal pump

    In the disassembly of mechanical seal, prohibited the use of hammer and chisel, so as not to damage the sealing element.

    If there are mechanical seal in the centrifugal pump at both ends, care must be taken in the demolition process, prevent the care for this and lose that.

On the mechanical seal, if loose gland sealing surface move, you should replace the static ring parts should not be re tightened continue to use. Because in the loose, friction will change the original orbit, the contact surface of the seal is very vulnerable to damage.

    If the sealing element is bonded to the dirt or agglomerate, the seal must be removed to remove the mechanical seal.