Rubber Sealing Manufacturer

What is an oil seal?

The oil seal is to prevent liquid or solid particles from leakage from the interlocking gap or other impurities and steam from intruding into the machine.

The best storage temperature is under 30 ℃, which can prevent the oil seals from aging because of the high temperature.

Performance of oil seals

1. Good compatibility:
   To avoid soaking in hydraulic oil long-term that will easily swell, dissolve or brittle hardening, etc., to reduce the role of sealing.
2. Improve the sealing:
   even in a high-pressure and high-temperature working environment, the leakage of the oil seal also has no effect.
3. Extended service life:
   Hydraulic oil seals should have good wear resistance, flexibility, pressure resistance, heat resistance, and cold resistance so that the service life grows.
4. Friction resistance:
   Reduce the dragging and other undesirable phenomena in low-pressure conditions in hydraulic equipment, and have a low static and dynamic friction resistance so that the friction coefficient should be stable.
5. Easy to manufacture and installation:
   Hydraulic oil seals should be easy to manufacture and install, the price should not be high, and there should be lower machining accuracy requirements for installation grooves.

How does the oil seal?

1. Oil seals must be protected from strong light exposure to prevent seals from being eroded by ozone in the air or prematurely aged.
2. The oil seal must exist in a sealed environment to avoid contact with moisture or dust in the air.
3. The best storage temperature for oil seals is below 30°C to avoid high-temperature aging of the seals.

The factors that affect the performance of various oil seals are different. For example, the influencing factors of mechanical seals may include temperature, moving direction, wear, and pressure.

How to select the proper oil seal?

Most users will select the oil seal according to the sample size and color and may not be able to select the right product. The following procedures are recommended to select the accuracy of the oil seal.

1. Direction of motion:
   Determine the location and mode of action of the oil seal, such as reciprocating, rotating, helical or stationary.
2. Oil seal focus:
   Example: The sealing effect is in the rod or in the piston.
3. Temperature:
   Deciding the material according to the original machine instructions or evaluating the operating temperature according to the actual working environment.
4. Pressure level:
   Check the data from the original machinery instructions or observe the original oil seal hardness and structure to infer work pressure level.
5. Size:
   Most users will purchase by used sample. After using a period, it will significantly affect the original size by temperature, pressure and wear and other factors.

It can only be a reference according to the used sample. The better method is to measure the oil seal installation space; the accuracy will be higher.

Oil seals installation precautions

1. Whether the associated surface of the piston, cylinder, and guide sleeve is clean,burr-free, and edgeless or not.
2. It is suitable for coaxial pistons and cylinders, whether in vertical or horizontal installation. Excessive eccentricity may damage the seal.
3. The mounting tool must be smooth and free of edges and sharp corners to ensure the seals are not damaged during installation.
4. The installation speed should follow the procedure steps, or it may damage the seal.
5. Apply a small amount of lubricating oil on the surface of the seals, and the cylinder will install easily. After installation, it can not leave grease on. Otherwise, it will affect the sealing performance.

Influencing factors of oil seal

Oil seals have a crucial effect on the operation of machinery. As long as one of the oil seals is not functional, it will affect the performance of the hydraulic or pneumatic machinery.

The most important factors affecting the oil seal

1. Pressure:
   The level of pressure will change with the length of the cycle. The higher the pressure, the greater the effect on seal performance, Material, speed, the gap between the piston and the cylinder, and the gap between the piston and the cylinder head.
2. Surface characteristics:
   The surface characteristic is defined by the value of the surface roughness RA. RA is the arithmetical mean of the surface shape deviated from the absolute value of the centerline. The values do not necessarily imply that the oil seal affects the surface condition. Because of the same roughness and different surface shapes, it can result in different wear patterns on the oil seal.
3. Temperature:
   It is difficult to describe the use of oil seal materials at the maximum temperature and minimum temperature. It is the result of comprehensive effects. The operating temperatures of the piston and the piston rod are different.It needs to distinguish the difference. The roughness of the oil seal surface, pressure, temperature, material, and speed will affect the sealing.

Oil seals damage reasons

1. Wear:
   Oil seal wear is mainly related to parts of the surface, movement speed, and different materials to adapt to different movement speeds.
2. Corrosion:
   Oil seals soften and dissolve because of intermediaries infiltrating or selecting the wrong material.
3. Aging:
   Oil seal material will be hardened by temperature. If the oil seal is too high, it can not normally fill the gap with the parts, resulting in a leak.
4. Extrusion:
   Oil seals result in a leak because of too much pressure, so evaluate the hardness of the oil seals and whether the gap is too large with the installation.

This can occur if the selection of the wrong type, processing, or installation.