How is the sealing performance of high-pressure ball valves guaranteed through design and materials?

The sealing performance of high-pressure ball valves is directly related to the safety, stability and efficiency of the entire hydraulic system. In order to ensure that high-pressure ball valves can maintain excellent sealing performance under various extreme working conditions, we have made in-depth considerations and optimizations in design and material selection. By utilizing the pressure of the medium and through ingenious structural design, the valve body, valve cover and other components can fit more closely under high pressure to reduce the risk of leakage. For example, if a double sealing ring design is adopted, even if one sealing ring fails due to wear or aging, the other sealing ring can continue to provide effective sealing, greatly improving the reliability of the valve. Multi-stage sealing structures such as stuffing boxes and O-rings are adopted to ensure that there is no leakage at the valve stem. At the same time, considering the friction and wear caused by the movement of the valve stem, wear-resistant materials are selected and a reasonable lubrication system is designed.
The sealing surface is ground and polished with high precision to ensure that the surface roughness is extremely low and reduce the possibility of medium penetration. If a conical or spherical sealing surface is used, the sealing contact area is increased by adjusting the angle and curvature of the sealing surface to improve the sealing effect. Design tiny elastic deformation areas on the sealing surface. When the medium pressure increases, these areas can automatically adjust to keep the sealing surface close.
Design a fireproof sealing structure, such as a fireproof sealing ring made of metal and graphite composite, to ensure that the valve can still maintain sealing in the event of a fire. Considering the explosive environment that the high-pressure ball valve may face, an explosion-proof structure is designed, such as adding exhaust holes and discharge channels to prevent explosions caused by excessive internal pressure.
Choose wear-resistant and corrosion-resistant materials such as high-performance cemented carbide, ceramics or silicon carbide to ensure that the sealing surface remains smooth and intact after long-term use. For special media, such as high temperature, high-pressure steam or corrosive liquids, choose special alloys or composite materials that are more resistant to high temperature and corrosion.
Choose polymer materials such as polytetrafluoroethylene (PTFE), polyperfluoroethylene propylene (FEP) or reinforced polytetrafluoroethylene (RPTFE), which have good elasticity and chemical stability and can adapt to changes in different media and temperatures. For high temperature or corrosive media, choose high temperature and corrosion-resistant rubber or elastomer materials, such as fluororubber, ethylene propylene rubber, etc.
According to the working pressure, medium characteristics and temperature range, choose the appropriate metal material, such as stainless steel, carbon steel, alloy steel, etc. Stainless steel is widely used in food, pharmaceutical and other industries due to its good corrosion resistance; carbon steel and alloy steel are suitable for heavy industries such as petroleum and chemical industry due to their high strength. For special environments, such as high temperature, high pressure or highly corrosive media, select special alloy materials, such as nickel-based alloys, titanium alloys, etc.
The products are precision-processed by advanced CNC machine tools and machining centers to ensure the dimensional accuracy and shape accuracy of each valve component. Heat treatment is performed on key components, such as quenching and tempering, to improve the hardness and wear resistance of the material. Non-destructive testing such as X-ray and ultrasonic testing is performed on the valve to ensure that there are no defects and cracks inside. Strict sealing performance tests are performed on the valve before leaving the factory, including pressure testing, leakage testing, etc., to ensure that the valve is leak-free within the specified pressure range.
The sealing performance of the high-pressure ball valve is jointly guaranteed by careful design optimization, selected material selection, and strict manufacturing process and quality control. These measures ensure that the high-pressure ball valve can maintain excellent sealing performance under various extreme working conditions, providing a strong guarantee for the safe, stable and efficient operation of the hydraulic system.