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Dongguan Mingzhen Rubber & Plastic Products Co., Ltd.

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Dongguan Minz Rubber & Plastics Co., Ltd.

Add.: No.4, New Industrial Road, Shipai Tangwei, shipai town, Dongguan City
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Several Factors Affecting the Sealing Performance of O-ring

Release time:

2018-06-09 12:30

Source:

1. Movement speed
When the movement speed is very low (<0.03 m/s), the smoothness of the equipment operation and whether there is a "crawling" phenomenon should be considered. When the movement speed is very high (>0.8 m/s), the oil film that plays the role of lubrication may be destroyed, and the oil seal may not get good lubrication and friction and heat, resulting in a greatly reduced life.
It is recommended that polyurethane or rubber-plastic oil seals work in the speed range of 0.03 m/s ~ 0.8 m/s.
2. Temperature
Low temperature will reduce the elasticity of polyurethane or rubber oil seal, resulting in leakage, and even the whole oil seal becomes hard and brittle. High temperature will make the oil seal volume expansion, soften, resulting in a rapid increase in friction resistance and pressure resistance of the oil seal during movement. It is recommended that the continuous working temperature range of polyurethane or rubber-plastic oil seal is -10 ℃ ~ 80 ℃.
3. Working pressure
The oil seal has a minimum starting pressure (minimum service pressure) requirements. Low pressure work must use low friction performance, starting resistance of small oil seal. Below 2.5MPa, polyurethane oil seal is not suitable; high pressure to consider the oil seal pressure deformation, need to use anti-extrusion retaining ring, groove processing also has special requirements.
In addition, oil seals of different materials have different optimal working pressure ranges. The optimum working pressure range for the polyurethane oil seal is 2.5~31.5MPa.
The influence of temperature and pressure on the sealing performance is interrelated, so we should consider it comprehensively.
4. Working medium
In addition to selecting the working medium in strict accordance with the manufacturer's recommend opinions, it is important to keep the working medium clean. The aging or pollution of the oil will not only cause the failure of the components in the system, accelerate the aging and abrasion of the oil seal, but also the dirt in it may scratch or embed the oil seal, causing the seal to fail. Therefore, the oil quality and cleanliness must be checked regularly, and the oil filter or oil must be replaced according to the maintenance specifications of the equipment. The air remaining in the oil in the oil cylinder will be compressed by high pressure to produce high temperature to burn out the oil seal and even carbonize it. In order to avoid this situation, exhaust treatment should be carried out at the beginning of hydraulic system operation. The hydraulic cylinder should also run at low pressure and slow speed for a few minutes to confirm that the residual air in the oil has been discharged before it can work normally.
5. Lateral load
Generally, the piston must be equipped with a support ring to ensure that the cylinder can withstand a large load. The seal and the support ring have completely different functions, and the seal cannot replace the support ring load. The hydraulic cylinder with lateral force must be added with a support ring with strong bearing capacity (metal ring can be used under heavy load) to prevent the oil seal from leaking and strange wear caused by working under eccentric conditions.
6. Hydraulic impact
There are many factors that produce hydraulic impact, such as the moment when the excavator bucket suddenly hits the stone, the crane lifts or puts down the heavy object. In addition to the factors, for high-pressure and large-flow hydraulic systems, the implementation of components (hydraulic cylinders or hydraulic motors, etc.), if the 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 working pressure of the system. Such a high pressure will tear the oil seal or squeeze it partially into the gap in a very short time, causing serious damage. Generally, the buffer ring and retaining ring shall be installed on the piston rod of the hydraulic impact cylinder. The buffer ring is installed in front of the oil seal to absorb most of the impact pressure, and the retaining ring prevents the oil seal from squeezing into the gap under high pressure and the root is bitten.

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