Welded power plant shut-off valves are designed for use in water and steam systems within thermal power plants. The small-caliber series, ranging from DN10 to DN40, features a compact and simple structure, making maintenance straightforward. These valves utilize a portable packing chamber and valve body design, ensuring reliable performance under high-pressure conditions. The valve body is manufactured from carbon steel or chromium-molybdenum-vanadium steel, while the sealing surfaces are surfaced with cobalt-based alloys to enhance wear resistance and durability. The stem is treated with anti-corrosion nitriding or electroless nickel plating to improve its resistance to harsh environments.
For larger diameters, from DN50 to DN100, the welded power plant shut-off valves also feature a robust flange connection between the valve body and cover, using metal toothed gaskets for a secure seal. This design ensures high rigidity and long service life, even under extreme operating conditions. The materials used remain consistent—carbon steel and chromium-molybdenum-vanadium steel—while the sealing surfaces continue to benefit from cobalt-based alloy surfacing. Additionally, the stud bolts on the flange are phosphated for enhanced corrosion protection and improved mechanical properties. These valves are ideal for critical applications in power generation, offering reliability, ease of maintenance, and long-term performance.
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