Several Ways to Check the Goods when Purchasing Mechanical Seals Parts

As a consumer, you will check the quality of the product on the spot on the spot. This seemingly simple inspection has great knowledge and determines the life of the product. Inspection of mechanical products requires more caution. If the original inspection method is improper, it will also lead to various defects in the product. The following will teach you how to check the quality of mechanical seals parts.

1. Overall inspection of mechanical seals parts

(1) There is no impurities inside the mechanical seals parts. Before assembling the mechanical seals parts, thoroughly clean the moving ring, static ring, shaft sleeve and other components.

(2) Check whether there are scratches, cracks and other defects on the surface of the dynamic and static rings. The existence of these defects will cause serious leakage of the mechanical seal. If possible, use special tools to check whether the sealing surface is flat. If the sealing surface is not flat, the pressure water will enter the sealing surface of the dynamic and static rings of the mechanical seals parts after assembly, separate the dynamic and static rings, and the mechanical seal will fail. If necessary, tooling can be made for hydrostatic test before assembly.

(3) Check whether the dynamic and static ring seat has defects that affect the sealing. For example, whether there are defects in the mating surface of the dynamic and static ring seat and the dynamic and static ring sealing ring.

(4) Check whether the compensation spring of the mechanical seal parts is damaged and deformed, and whether the stubborn coefficient changes.

(5) Check whether there are defects such as burrs and groove marks on the sealing sleeve.

(6) Clean and check whether all sealing rubber rings have defects such as cracks and pores, and measure whether the diameter of the rubber ring is within the tolerance range.

(7) For the mechanical seals parts with the pumping mechanism, it is also necessary to check whether the helix of the screw pump has defects such as cracks and broken wires.

(8) Check the clearance between the dynamic and static rings and the shaft or bushing. The inner diameter of the static ring is generally 1 to 2 mm larger than the shaft diameter. For the moving ring, in order to ensure the floating, the inner diameter is 0.5-1mm larger than the shaft diameter to compensate for the vibration and deflection of the shaft. However, the gap should not be too large, otherwise the moving ring seal will be stuck and the function of the mechanical seal will be damaged.

2. Mechanical seal parts shaft sleeve inspection

Check for rust and wear after removal. If the rust or wear is relatively light, it can be polished with fine sandpaper and reused. If the corrosion or wear is serious, the method of electroplating after processing can be used or the bushing can be replaced.

3. Mechanical seal parts seal inspection

After a period of use, the sealing ring loses elasticity or ages in most cases, and generally needs to be replaced with a new ring.

4. Mechanical seal parts spring inspection

(1) If the spring is not seriously corroded and can maintain its original elasticity, it is not necessary to replace it. If the rust is more serious or the elasticity is greatly reduced, a new spring needs to be replaced.

(2) After the parts of mechanical seal is repaired, reassemble it. After assembly, the pressure test is also carried out, and then it is put into normal operation.

(3) For the mechanical seal with assembled box, clean the box and check whether the groove is worn or deformed for correction and repair, re-grooving or replacement.