DN200 Knife Gate Valve, Ductile Iron GGG40, 8 Inches, Slurry

Key Specifications / Features

The DN200 Knife Gate Valve Supplier offers a robust slurry knife gate valve designed for handling abrasive and viscous media. This valve features a durable GGG40 ductile iron body, ensuring strength and reliability. With a DN200 size (equivalent to 8 inches) and rated for a pressure of PN10 (Class 150 LB), it is equipped with wafer ends for easy installation and manual operation for user-friendly control.

The integral slurry valve is a full-bore design, with the entire valve body flow channel lined in wear-resistant polyurethane. This prevents the flushing medium from contacting the metal body, significantly extending its wear resistance and service life. With a full-bore passage matching the pipeline's inner diameter, the medium flows smoothly without generating eddy currents, reducing erosion. When fully opened, the valve plate is lifted into the valve chamber, avoiding direct contact with the medium and further prolonging the disc's lifespan.

Technical Specification

» Structure: Bidirectional knife gate valve
» Nominal Diameter: NPS 2–24 Inch DN50–DN600)
» Design Pressure: PN10, PN16, Class 150 LB
» Working Pressure: 10.3 bar (150 PSI)
» Operating Pressure: 6.2 bar (90 PSI)
» Body Material: GGG40, ASTM A351 CF8, CF8M, Special Alloys, etc.
» Seat Material: EPDM (120°C), NBR (80°C)
» Flange Standard: GB/T 9113.1, JB/T 79.1, HG 20592, ASME B16.5, EN 1092-1
» Face-to-Face: MSS SP-81
» Operation: Manual, Pneumatic, Electric, Hydraulic
» Temperature Range: -29°C to 120°C

Product Features

The integral slurry valve features multiple enhancements for durability and efficiency. A self-cleaning disc design incorporates a valve plate scraper inside the sleeve, which automatically cleans the plate surface during up-and-down movement, preventing material buildup, increased operating torque, or blockage. The integrated elastomeric filler, molded from wear-resistant, high-rebound rubber, ensures a tight seal with both the stuffing box and polyurethane liner, delivering improved sealing performance, extended lifespan, and simplified replacement. The valve seat adopts a self-flushing structure that prevents slurry sedimentation at the bottom, guaranteeing zero leakage upon closure. For maintenance, the removable seat and upper sealing structure allow worn liners or seals to be replaced on-site, restoring the product to its original service life at just 15–20% of the full valve replacement cost.