This delivery covers a DN400 bevel gear operated Y-pattern pressure seal butt-weld globe valve, primarily designed for main steam and hot reheat steam systems in 1,000 MW-class thermal power generation units. It is suitable for medium shut-off and system isolation under severe operating conditions involving high temperature, high pressure, and frequent thermal cycling, and is strictly designed, manufactured, and tested in accordance with ASME B16.34, JB/T 3595 power plant valve standards, and project technical specifications.

DN400 blue Y-pattern pressure seal butt-weld globe valve, equipped with a bevel gear operating mechanism, for use in high-temperature and high-pressure main steam pipelines in large thermal power plants.

The valve body is manufactured from ASTM A217 WC9 chromium-molybdenum heat-resistant cast alloy steel, while ASTM A182 F91 and other heat-resistant forged alloy steels may also be selected according to project technical specifications and pressure-retaining component requirements. Combined with a pressure self-tightening seal structure and a bevel gear reduction mechanism, the sealing force applied to the bonnet sealing ring increases as the internal valve pressure rises, effectively improving sealing reliability under high-pressure operating conditions.

The Y-pattern low-flow-resistance passage reduces abrupt changes in the flow direction of the steam medium, effectively lowering flow resistance, pressure loss, and medium erosion in large-diameter pipelines. The bevel gear operating mechanism significantly reduces the opening and closing torque required for the DN400 large-diameter valve, ensuring stable operation, reliable shut-off, and long-term performance under operating conditions involving temperatures of approximately 570°C, ultra-high pressure, and frequent thermal cycling.

Backed by intelligent manufacturing and stringent quality control, DAQIAN Valves has established a reliable, stable, and trustworthy project delivery system within the global industrial valve supply chain.

Every DAQIAN valve undergoes rigorous material inspection, nondestructive testing, dimensional inspection, pressure testing, and functional testing to ensure continuously stable and reliable operation under varying and severe operating conditions, consistently meeting and exceeding customer expectations.

Sincere thanks to our global customers and partners for their long-term trust and support.

DAQIAN Valves is committed to delivering not only products, but also quality, trust, and long-term value—Connecting the World, Creating Prosperity Together.

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