Large-Diameter Flanged Check Valve H44T-16Q DN250 PN16 Copper Core Swing Ductile Iron

This DN250 (10") flanged swing check valve belongs to the H44T-16Q copper core series, recognized for its robust QT450 ductile iron body, copper alloy sealing surfaces and simple swing-disc mechanism. Rated at PN16 with German standard style flanged ends, it is supplied ready for installation in municipal water networks, building services and general industrial pipelines where one-way flow control and reliable anti-backflow performance are essential.

• QT450 Ductile Iron Body: The valve body and bonnet are cast from QT450-10 ductile iron, delivering high tensile strength and excellent impact resistance while remaining lighter and more economical than cast steel for water service.
• Copper Alloy Disc & Seat: The swing disc and seat ring are machined from copper alloy (brass), providing a stable metal-to-metal hard seal surface that resists corrosion, scaling and repeated opening cycles in water media.
• PN16 Flanged Connection: Flanged end connections are drilled to ISO 7005-2 / DIN PN16 patterns, allowing quick, secure installation between standard pipeline flanges with conventional gaskets and bolting.
• Single Disc Swing Structure: The single-disc swing design opens fully under forward flow and closes automatically when flow reverses, giving dependable one-way protection with minimal flow resistance.
• Straight-Through Full Flow: A straight-through, round-body (round belly) passage keeps pressure drop low and allows the valve to handle suspended particles better than lift-type check valves.
• Factory Direct Supply: As a source factory with large stock of finished valves, we offer short lead times, customization of body marking, packaging and coating, plus responsive after-sales service.

Construction: The valve consists of a ductile iron body, a hinged copper alloy disc assembly and a renewable seat ring. The disc swings on a sturdy hinge pin; when upstream pressure exceeds downstream pressure the disc lifts off the seat and flow passes freely, and when flow stops or reverses, the disc returns to the closed position under its own weight and back pressure, forming a tight metal-to-metal seal. No springs or external actuators are required, which simplifies maintenance and reduces the risk of mechanical failure over the service life.

Applications: The valve is also a common choice for oil field surface water injection, sewage treatment plant inlet and outlet piping, and irrigation pumping stations, protecting pumps and meters from backflow damage.

Packaging & Quality Assurance: Every valve is hydrostatically shell tested at 2.4 MPa and seat tested at 1.76 MPa in line with GB/T 13927 and API 598 requirements before dispatch. Exterior surfaces receive anti-rust primer with blue or black finishing paint; flange faces are protected with wooden or plastic covers. Small sizes are packed in cartons with foam inserts and palletized, while larger diameters are secured in plywood wooden cases with internal foam supports, ready for sea freight. Our factory operates under ISO 9001 quality management and offers a 12-month warranty against manufacturing defects.

Customization: We accept OEM production with customer brand marking on the body, customized paint color, special flange drilling standards (ANSI, DIN, GB), and alternative disc materials. Please let us know your nominal size, quantity and application when inquiring so we can recommend the most economical specification.