Several reasons and treatment methods for poor sealing of sealing rings

Rubber sealing rings often leak oil, water, oil, etc., which are mainly caused by various reasons inside and outside the seals. The following sealing ring manufacturers summarize several reasons for poor sealing of sealing rings and corresponding treatment methods:

1. Hydraulic shock

There are many factors that cause hydraulic shock, such as the excavator bucket suddenly hitting a stone, and the moment when the crane lifts or puts down a heavy object. In addition to external factors, for high-pressure and high-flow hydraulic systems, when the actuator (hydraulic cylinder or hydraulic motor, etc.) is switched, if the reversing valve performance is not very good, it is easy to produce hydraulic shock. The instantaneous high pressure generated by hydraulic shock may be several times the system working pressure, so the high pressure will tear the oil seal or partially squeeze into the gap in a very short time, causing serious damage. Generally, the oil cylinder with hydraulic shock should be installed with a buffer ring and a retaining ring on the piston rod.

2. Movement speed

When the movement speed is very low (0.03m/s), the stability of the equipment operation and whether there is a "creeping" phenomenon should be considered. When the movement speed is very high (>0.8m/s), the oil film that acts as a lubricant may be damaged, and the rubber seal ring will generate friction and heat due to poor lubrication, which greatly reduces its life.

3. Working medium

In addition to strictly selecting the working medium according to the manufacturer's recommendations, it is essential to keep the working medium clean. Aging or contamination of the oil will not only cause component failure in the system, accelerate the aging and friction damage of the oil seal, but also the dirt may scratch or embed in the oil seal, making the rubber seal ring seal ineffective. Therefore, it is necessary to check the quality and cleanliness of the oil regularly and replace the oil filter or oil according to the equipment maintenance specifications. The air remaining in the cylinder will burn or even carbonize through high-pressure compression. To avoid this, the hydraulic system should be exhausted at the beginning of operation. The hydraulic cylinder should also run slowly at low pressure for a few minutes to confirm that the residual air in the oil can be discharged before it can work normally.

4. Side load

The support ring must generally be installed on the piston to ensure that the cylinder can withstand a larger load. The rubber seal and the support ring play completely different roles, and the rubber seal cannot replace the load of the support ring. Hydraulic cylinders with lateral forces must add support rings with strong bearing capacity (metal rings can be used when overloaded) to prevent leakage and abnormal wear of the oil seal under eccentric conditions.

The above is a summary of several reasons for the poor sealing of the sealing ring and the corresponding treatment methods. I hope it can be helpful to you!

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