Quanxing Valves’ DN1600 large-diameter high-pressure swing ball valves were successfully delivered for the upgrade of the circulation system at the Yinghang Power Plant

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Recently, the PN40 large-diameter high-pressure two-way swing ball valve developed by Quanxing Valve Group (with a diameter of up to DN1600 mm) was successfully manufactured. It passed the strict tests conducted by the **Pump and Valve Product Quality Supervision and Inspection Center, and has since been sent to a large power plant for use in its circulating water system. This breakthrough product solves the worldwide challenge of metal sealing under high-pressure and large-diameter conditions, marking a new milestone for China in the field of large-diameter high-pressure valves. The large-diameter, high-pressure two-way swing ball valve with PN40 rating and DN1600mm size, developed by Quanxing Valve Group, has overcome numerous technical challenges. This valve features a pure-metal-to-pure-metal construction, with a dual-floating all-metal seal design for the valve seat. This structure ensures that the valve can achieve a zero-leakage seal in both directions even under high-pressure conditions. The product features a unique eccentric design that allows the sphere to separate from the valve seat instantly during opening and closing, enabling friction-free rotation and effectively solving the problems of valve seat wear and sticking caused by friction in traditional valves. The valve core of the sealing pair is provided with a compensation amount; when the valve seat wears out, turning it a little more during closing still ensures reliable sealing, thereby significantly extending its service life. In terms of manufacturing processes, advanced techniques such as space plasma spraying are used for the valve sealing surfaces to create cemented carbide gradient functional materials that possess both high strength and wear resistance, enabling them to function in severe environments over a certain temperature range. The DN1600mm large-diameter high-pressure two-way rotary ball valve, which has been successfully manufactured, will be used in the circulating water system of a large power plant. This operating condition requires the valve to not only possess high-pressure sealing capabilities but also be able to withstand the erosive wear caused by media containing particles. Compared to traditional valves, this rotary ball valve boasts superior shear and self-cleaning capabilities, which effectively prevent valve clogging; it is particularly suitable for applications involving particulate media. The circulating water system in power plants has extremely high requirements for the reliability of valves, as a failure in these valves can lead to the shutdown of the entire plant. The products of Quanxing Valve Group feature a \"hard-to-hard\" sealing structure and an eccentric design, which effectively solves the problems of easy wear and leakage of the sealing surfaces in traditional valves under conditions of high pressure differences and media containing particles. The successful application of this valve provides the power industry with a more reliable and durable valve option, while also laying a solid foundation for China’s manufacturing sector to replace imported valves in the high-end valve market.