Notice of Liquid O-Rings and influence of friction on Liquid O-Rings

Precautions for use

1. When the piston rod is impossible to be chamfered and threaded, please use the following figure for installation, and pay attention to prevent damaging the liquid O-rings.

2. When installing the liquid O-rings into the groove, please take care not to use the liquid O-rings to twist during installation.

3. When installing liquid O-rings, please apply sealing medium to groove and liquid O-rings.

4. In principle, liquid O-rings should not be reused.

5. When installing the liquid O-rings as it is, keep the inside of the machine clean. Please do not use cleaning liquid and gasoline to prevent the rubber from swelling.

6. When using liquid O-rings and groove size, due to the combination of size tolerance, sagging of groove inner diameter may occur as shown in the figure below. Please do not bite liquid O-rings during installation.

liquid O-rings are used in all kinds of pipes. What kind of influence will friction bring to liquid O-rings?

In the sealing device, friction will wear the liquid O-rings and affect the sealing. The degree of wear mainly depends on the size of static friction. When the liquid pressure is small, the friction size of the liquid O-rings depends on its compression shrinkage. When the working fluid is under pressure, the friction increases with the increase of the pressure of the conveying pipeline. When the working pressure is less than 20MPa, it is approximately linear. When the pressure is greater than 20MPa, the increase of liquid O-rings and metal contact area will slow down gradually, and the friction will increase correspondingly.

In general, the service life of liquid O-rings is tight with the increase of hydraulic pressure, and the pressure of the transmission pipeline is strictly controlled. The increase of friction in the process of installation results in the heat of friction between the installation rotation and the liquid O-rings. Because most liquid O-rings are made of rubber, their thermal conductivity is very poor. Therefore, friction heat will lead to aging of rubber and loss of liquid O-rings seal.

Friction can also cause damage to the surface of the liquid O-rings, reducing the amount of compression. Serious friction will damage the surface of liquid O-rings, and the loss of sealing will affect the safety of pipeline. So friction will seriously affect the liquid O-rings seal.

liquid O-rings is suitable for all kinds of mechanical equipment, in the specified temperature, pressure and different liquid and gas medium, in the static or moving state of the sealing effect. In machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, engineering machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery and other instruments, a large number of types of seal elements are applied. liquid O-rings are mainly used for static and reciprocating seals. For rotary motion seals, only for low speed rotary seals. liquid O-rings are usually installed on seals with rectangular cross-section of outer ring or inner ring. liquid O-rings still play a good role in sealing and shock absorption in oil, acid, grinding, chemical erosion and other environments. Therefore, liquid O-rings are the most widely used hydraulic and pneumatic transmission systems for sealing.

The O-ring has its own sealing function without periodic adjustment. When it is used for sliding sealing, its sealing performance can not be affected by the direction of movement. It is small in size and easy to use. Because of its large adaptability, it has a wide range of applications. However, it is easy to deform when the pressure peak reaches a certain pressure, which may extrude the gap. In aviation and water conservancy engineering, it should Use more.