Firstly, the sealing performance of high-pressure servo valve is directly related to the efficiency, response speed and service life of the system. Because its working pressure is often as high as tens of MPa, if the sealing performance is not good, it will not only lead to hydraulic oil leakage, affect the control accuracy of the system, but also cause environmental pollution and security risks. Therefore, in the process of design and manufacture, various measures must be taken to ensure its good sealing performance.
I. Precision Machining and Assembly Technology
The internal structure of high-pressure servo valve is complex, mainly composed of valve core, valve sleeve, spring, electromagnetic coil and other components. In order to achieve a good sealing effect, the mating gap between the valve core and the valve
sleeve must be controlled at micron level. Through the use of high-precision CNC machine tools for processing, and the use of honing, grinding and other finishing processes, to ensure that the surface smoothness and parallelism of parts meet the design requirements. In addition, strict assembly process and clean assembly environment can also effectively prevent impurities from entering the sealing area and affecting the sealing performance.
Second, the sealing material and structural design
The choice of sealing material is very important to the sealing ability of high pressure servo valve. At present, the commonly used sealing materials include high-performance materials such as fluororubber (FKM) and polytetrafluoroethylene (PTFE), which have good high temperature resistance, corrosion resistance and aging resistance. At the same time, reasonable sealing structure design, such as lip seal ring, O-ring or combined sealing structure, can enhance the contact
pressure of sealing surface, improve compression resistance and prevent leakage.
Third, the coordination of dynamic seal and static seal
In the working process of servo valve, there are both static sealing between fixed parts and dynamic sealing caused by spool movement. In order to solve the problem of dynamic sealing, seals with low friction coefficient are usually used to reduce the motion resistance and maintain good sealing performance. In addition, some high-end servo valves will also adopt hydraulic balance design, so that the sealing surface will automatically fit under high pressure, thus improving the sealing reliability.
Fourth, regular maintenance and testing
Even if the design and manufacture are more precise, the sealing performance of high-pressure servo valve may decrease after long-term operation. Therefore, regular maintenance and inspection are indispensable. By using high-precision detection equipment, such as leakage detector and pressure tester, potential leakage problems can be found in time and repaired to ensure the continuous and stable operation of the equipment.
To sum up, the sealing performance guarantee of high-pressure servo valve is a systematic project, involving material selection, structural design, processing technology and post-maintenance and many other aspects. Only by strictly controlling each link can we truly realize efficient and reliable sealing in high-pressure environment and provide solid guarantee for the stable operation of hydraulic system.