OS&Y Rising Stem Gate Valve Z41T-10 DN250 PN10 HT200 Cast Iron Flanged Copper Seal

The DN250 Z41T-10 rising stem gate valve is a flanged shut-off valve manufactured with an HT200 grey cast iron body and a copper alloy wedge sealing surface. It is designed for water supply and drainage systems where a tight, dependable shut-off with low flow resistance is required. The outside screw and yoke (OS&Y) construction raises the stem visibly when the valve opens, giving operators a clear indication of the disc position at a glance. The DN250 valve is produced to the Chinese national standard with flanged end connections and is operated manually through a handwheel, making it a simple and reliable choice for municipal waterworks, building services and industrial pipelines. YUXIN manufactures this DN250 model with precision machining, strict shell testing and careful assembly so that every unit delivers stable performance and a long service life.

• HT200 Cast Iron Body: The high-strength grey cast iron shell is rigid, wear resistant and economical, providing stable pressure bearing capacity for water pipeline service.
• Rising Stem (OS&Y) Design: The outside screw stem rises above the yoke when opened, allowing visual confirmation of the open or closed position and easy lubrication of the thread.
• Copper Alloy Wedge Seal: The bronze wedge and seat ring form a reliable metal-to-metal hard seal, resistant to erosion and suitable for frequent operation.
• Stainless Steel Stem and Brass Nut: The stem is made of stainless steel or copper rod with a brass nut, giving smooth operation, corrosion resistance and a long working life.
• Flanged End Connections: PN10 flanges with standard drilling allow direct installation onto GB or DIN pipework using conventional gaskets and fasteners.
• Manual Handwheel Operation: The sturdy handwheel provides smooth, easy opening and closing without the need for power supply, suitable for outdoor and remote installations.
• Factory Direct Support: As a manufacturer, YUXIN supplies customised DN250 sizes, special flange drilling and batch production with stable lead times.

The DN250 Z41T-10 gate valve is widely used in water supply and drainage networks, water conservancy projects, building services, chemical plants, petroleum facilities, pharmaceutical workshops, sewage treatment stations and power generation systems. The DN250 bore is commonly used on secondary distribution mains and large building supply risers. In a municipal water main the valve isolates pipeline sections for maintenance; in a pumping station it protects pumps and meters during start-up and shut-down; in an industrial plant it provides dependable shut-off for process water and cooling circuits. The sturdy cast iron body, copper alloy sealing and corrosion resistant stem make the DN250 model suitable for raw water, treated water and mild effluent duties where a tight shut-off and low pressure drop are required.

Each DN250 valve is wrapped with flange covers to protect the sealing faces, then packed in a standard export wooden case with foam cushioning according to the valve weight and shipping route. YUXIN holds ISO 9001:2015 quality management certification and performs 100 percent shell and seat pressure testing before dispatch. Samples are welcomed for evaluation, and the factory can adjust DN250 dimensions, flange drilling and surface coating on request. For detailed drawings, test certificates and quotation, please contact our export team directly.