Bucket Cylinder Seal Kit Komatsu 721-98-01740 721-98-01740 For PC490LCI-11 Bucket Cylinder Repair Kit

Product Show:

Related Part:

Order Process:

1. Getting your inquiry (Including: machine model, part name, order quantity, data of items, delivery term)

2. Quoting our competitive price for you

3. Place an order after approving the quotation or products

4. We will send Proforma Invoice or sales confirmation

5. You prepay by T/T or L/C or Western Union through bank

6. We will starting to produce after we get your kind payment

7. Packing

8. Shipping the goods to your(our)forwarder

9. Sending all doc for your custom clearance

10. Time to reorder

Common failure causes and improvement measures of seals:

The failure of seals due to raw materials is mainly manifested in two aspects: improper material selection and quality problems in the material itself. When the sealing material is not compatible with the fluid, the rubber absorbs the liquid and swells, resulting in permanent deformation; or the rubber material If the hardness is improperly selected and the elasticity is not good, it will not be able to play a sealing role, resulting in seal failure and leakage.

Considering the convenience of process operation, materials that can theoretically achieve the performance of rubber seals are selected, but the rubber seals fail due to the formulation or vulcanization process. Or the selected rubber friction coefficient is not suitable, the rubber compound is mixed unevenly or impurities are accidentally mixed in the mixing process, the amount of additives exceeds the standard or segregation, pores, porosity, and poor interface between the reinforcing agent and the matrix material. , will cause the performance of the seal to decline and fail.

Seal leakage analysis during operation of equipment:

The centrifugal force generated by the high-speed rotation of the pump mechanical seal after the static test will inhibit the leakage of the medium. Therefore, the leakage of mechanical seals during operation is basically the seal failure caused by the damage of the dynamic and static ring friction pairs after eliminating the seal failure between the shaft and the end cover;

Factors causing the failure of the friction pair seal:

1. During operation, due to abnormal phenomena such as evacuation, cavitation, pressure holding, etc., a large axial force is caused, so that the contact surfaces of the dynamic and static rings are separated;

2. When the mechanical seal is installed, the amount of compression is too large, resulting in serious wear and injury on the end face of the friction pair;

3. The moving ring seal is too tight, and the elastic bud cannot adjust the axial floating amount of the moving ring;

4. The static ring seal is too loose. When the moving ring floats axially, the static ring is separated from the static ring seat;

5. There are granular substances in the working medium, which enter the friction pair during operation and damage the sealing end faces of the dynamic and static rings;

6. The design and selection are wrong, the specific pressure of the sealing end face is low or the cold shrinkage of the sealing material is large;

The above situation often occurs in the trial operation, and sometimes can be eliminated by properly adjusting the static ring seat, etc., but most of them need to be disassembled and replaced.