Flanged Swing Check Valve H44T DN65 PN16 QT450 Ductile Iron Body Copper Alloy Seat

The H44T DN65 swing check valve is a flanged non-return valve manufactured with a QT450 ductile iron (GGG50) body and a precision-machined copper alloy seat ring. It is designed to prevent reverse flow in horizontal water pipeline systems where reliable one-way media movement is required. The round-body casting distributes pressure evenly across the shell, while the swing disc opens fully under forward flow to keep head loss low and closes automatically the moment flow reverses. Every DN65 valve is produced to the Chinese national standard with flanged end connections, making installation between standard pipe flanges quick and straightforward. This valve series is widely selected for clean water supply, sewage transfer, cooling water circuits and other neutral liquid services that demand dependable backflow protection over a long working life.

YUXIN factory controls the complete production chain from ductile iron melting and casting to machining, assembly and pressure testing. The DN65 swing check valve body is cast from QT450 spheroidal graphite iron, a material recognised for its high tensile strength, good elongation and excellent resistance to impact and corrosion. The internal seat uses a copper alloy ring that resists erosion from water flow and provides a tight metal-to-metal closure surface. Because the valve has no complex actuating mechanism, it requires virtually no maintenance after installation and can operate for years in buried, pit or indoor pipeline applications. Each unit is finished with a blue anti-corrosion paint coat that protects the external surface during transport, storage and outdoor installation.

• QT450 Ductile Iron Body: Spheroidal graphite cast iron shell delivers high strength, pressure resistance and corrosion resistance for long-term pipeline service.
• Copper Alloy Seat Ring: The DN65 valve uses a wear-resistant copper alloy seating surface that maintains a dependable seal and resists erosion by flowing media.
• Flanged End Connections: Standard flanged design simplifies alignment, bolting and disassembly during installation, inspection and maintenance.
• Swing Disc Low Head Loss: The full-bore swing disc opens smoothly under forward flow, keeping pressure drop minimal in the DN65 line.
• Round Body Pressure Distribution: The rounded casting profile distributes internal pressure evenly and improves resistance to water hammer.
• Automatic Backflow Prevention: The disc closes automatically when flow stops or reverses, protecting pumps, meters and upstream equipment.
• Strict Quality Inspection: Each valve is shell and seat tested under pressure before delivery, with certificates available on request.

The DN65 H44T ductile iron swing check valve is widely used in municipal water supply and drainage networks, water conservancy projects, building water systems and industrial pipelines. It is also a proven choice for chemical plants, petroleum facilities, pharmaceutical factories, sewage treatment stations and power generation plants where reliable one-way flow control protects rotating equipment and prevents media backflow. For a DN65 line carrying clean water, cooling water, raw sewage or other neutral liquids under normal temperature, this flanged swing check valve offers an economical and durable solution. It can be installed in pump discharge lines, branch pipelines, metering stations and storage tank outlets to stop return flow automatically without the need for an external power supply or operator action.

Customisation is available for the DN65 series. As a source factory with more than ten years of valve production experience, YUXIN can machine special flange drillings, adjust face-to-face dimensions, supply alternative body materials or provide larger and smaller diameters according to project drawings and technical questionnaires. Large warehousing capacity ensures that popular sizes including DN65 are kept in stock and can be dispatched quickly after order confirmation.

Every DN65 check valve is pressure tested in accordance with the relevant GB standard before packing. The factory applies strict incoming material inspection, dimensional control during machining and final shell and seat testing to guarantee leak-free performance. Valves are individually protected with flange covers and packed in standard export cartons or plywood cases according to size, with the blue painted surface further shielded to prevent scratches during long-distance sea or air freight. The YUXIN quality management system is certified to ISO 9001:2015, and test certificates, material certificates and inspection reports can be supplied with the shipment. With a minimum order quantity of one piece, buyers are welcome to request samples, mixed-size containers and OEM packing, and the sales team typically replies to technical enquiries within 12 hours.