707-98-25960 7079825960 Bucket Cylinder Seal Kit For PC58UU-3 Komatsu Bucket Cylinder Sealing Kit

707-98-25960 7079825960 Bucket Cylinder Seal Kit For PC58UU-3 Komatsu Bucket Cylinder Sealing Kit

Types and uses of sealing materials:

The sealing material should meet the requirements of sealing function. Due to the different media to be sealed and the different working conditions of the equipment, different adaptability of the sealing material is required. The requirements for sealing materials are generally:

1.The material has good compactness and is not easy to leak the medium;

2.have appropriate mechanical strength and hardness;

3.Good compressibility and resilience, and small permanent deformation;

4.No softening or decomposition at high temperature, no hardening or brittle cracking at low temperature;

5.Good corrosion resistance, can work for a long time in acid, alkali, oil and other media, its volume and hardness change is small, and it does not adhere to the metal surface;

6.Small friction coefficient and good wear resistance;

7.It has the flexibility to combine with the sealing surface;

8.Good aging resistance and durability;

9.It is convenient to manufacture, cheap and easy to obtain.

Rubber is the most commonly used sealing material. In addition to rubber, graphite, polytetrafluoroethylene and various sealants are suitable for sealing materials.

Influencing factors of seals:

Hydraulic seals play a vital role in the integration of hydraulics and pneumatics. If the seals of a hydraulic and pneumatic component product are not good enough, then this hydraulic and pneumatic component product is not a good product. There are many factors that affect seals.

(1) First of all, pressure is an important factor affecting the quality of the seal. The level of pressure and the length of the pressure cycle change have a great impact on the damage of the seal (such as extrusion). The higher the pressure, the greater the impact of other factors on the performance of the seal, such as temperature, speed, seal material, clearance between the piston and cylinder, and clearance between the piston and cylinder head.

(2) Another one is temperature and friction. It is difficult to describe the maximum use temperature and minimum use temperature of a seal material, because it is the result of the combined influence of a series of factors. For the different working temperatures of the piston and the piston rod, they should be selected differently. Another is the surface roughness of the seal product, the characteristics of the surface, the pressure, the medium, the temperature, the material of the seal, the type of the seal and the speed of movement, which are all factors that affect the seal.

(3)The last one is surface treatment. Experience has shown that the characteristics of the surface of the cylinder piston and piston rod have a great influence on the life of the seal. Surface properties are often defined by the value of surface roughness RA, which is the arithmetic mean of the absolute value of the deviation of the surface shape from the centerline. However, these values ​​do not fully represent the effect of the surface condition on the seal, because even with the same roughness, different surface shape features can cause different degrees of seal wear to the seal.

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