Main Parameters
• Pressure: Primarily PN10 and PN16
• Temperature: Generally ≤ 120℃
• Diameter: DN50～DN1000 (Very common)
• Seal: Soft seal and hard metal seal
• Drive method: Handwheel, bevel gear, pneumatic, electric
Applicable Media
• Sewage, sludge, mud, slurry
• Pulp, fiber, mineral slurry
• Dust, fly ash, powder
• Wastewater treatment plants, paper mills, mines, metallurgy, ash and slag pipelines
Structural Features
• Mostly adopt a knife gate structure (knife-type slurry valve)
• Straight flow path with no dead angles, less prone to slurry accumulation and slag blockage
• Valve body, gate, and sealing surfaces are all treated with wear-resistant materials
• Common materials: polyurethane lining, wear-resistant alloy, ceramic, wear-resistant rubber
• Connections are mostly wafer type or flange type, predominantly for large diameters
Core Structure
• Valve Body: Ductile iron/WCB, fully lined with polyurethane (PU)
• Gate: Stainless steel (304/316/2205) + polyurethane coating
• Sealing: Polyurethane seat (soft seal)
• Connection: Wafer type / Flange type
• Drive: Manual, pneumatic, electric, bevel gear
Structural Features
• The gate is longer than the valve body, allowing it to completely penetrate the valve body during opening and closing.
• It has a guide bracket at the top and generally an outlet cover/discharge port at the bottom.
• The gate operates more stably, without deviation or bending.
• Mostly wafer or flange type, providing greater overall rigidity.
• Driven manually, pneumatically, or electrically.
Ceramic knife gate valves (also known as ceramic knife-type gate valves) are special valves that combine a knife gate valve with a high-performance ceramic seal. The core seal and flow components are made of toughened alumina/silicon carbide ceramic, while the valve body is typically made of carbon steel (WCB) or stainless steel (304/316L).
Structure and Principle
• The opening and closing element is a knife-edged gate, moving perpendicular to the media flow direction, cutting media containing particles and fibers through shearing.
• The gate rises and falls within a side guide groove, and the bottom lug tightly presses against the valve seat, eliminating cavities, slag accumulation, and jamming.
• The valve seat commonly uses a protective lip ceramic ring + O-ring to achieve a bidirectional hard seal, with a leakage level reaching ANSI Class VI.
