Views: 0 Author: J-VALVES Publish Time: 2024-08-22 Origin: Site
In the field of modern industry, as an important fluid control equipment, gate valves are widely used in multiple industries such as petroleum, natural gas, chemical engineering, and electric power. Sealing performance is one of the key indicators for measuring the quality of gate valves and directly affects the safety and reliability of the system. With the continuous progress of technology, the sealing structure design of gate valves is also constantly innovating to meet increasingly stringent working condition requirements and environmental protection requirements.
Limitations of traditional sealing structures.
The traditional sealing structure of gate valves mainly relies on two methods: metal sealing and soft sealing. Metal sealing usually uses stainless steel or alloy materials to achieve a tight fit of the sealing surface through precision processing. However, metal seals may experience a decline in sealing performance in high-temperature,high-pressure, or low temperature environments. Especially under frequent opening and closing conditions, the sealing surface is prone to wear, leading to an increased risk of leakage. Soft seals mostly use materials such as rubber and polytetrafluoroethylene. Although the sealing performance is better, the high-temperature resistance and corrosion resistance are relatively weak, and it is easy to deform under high-pressure working conditions, affecting the sealing effect.
To overcome the limitations of traditional sealing structures, in recent years, researchers and engineers have developed a series of new sealing structure designs, significantly improving the sealing performance and service life of gate valves.
The double sealing structure is an innovative design that combines the advantages of metal sealing and soft sealing. On the basis of metal sealing, a layer of flexible graphite or polytetrafluoroethylene sealing layer is added. This design not only utilizes the high strength and high temperature resistance of metal sealing, but also further improves the reliability and flexibility of sealing with the help of the elasticity of the soft sealing layer. The double sealing structure is particularly suitable for extreme working conditions such as high pressure, high temperature or low temperature, and can effectively prevent medium leakage and prolong the service life of valves.
The hydraulic sealing structure is a new design that realizes sealing by using hydraulic principles. It sets up a hydraulic cylinder inside the valve body and uses the pressure of hydraulic oil to tightly press the sealing ring on the valve seat to achieve sealing. The hydraulic sealing structure has the characteristics of large sealing force and stable sealing performance. It is especially suitable for gate valves with high pressure and large diameter. In addition, the hydraulic sealing structure can also be remotely controlled through an external hydraulic system, further improving the convenience and safety of operation.
