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Ceramic Knife Gate Valve

Ceramic Knife Gate Valve

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.
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Product Description

Core Performance

 

• Super Wear Resistance: Ceramic hardness HRA85–95, wear resistance 10 times+ that of ordinary metals, extremely strong resistance to particle erosion.

• Strong Corrosion Resistance: Resistant to strong acids, strong alkalis, salts, and organic solvents, virtually unaffected by corrosion.

• High Temperature Resistance: Applicable temperature range -40℃ to 300℃, excellent thermal stability.

• Reliable Sealing: Hard seal + protective lip structure, prevents shearing by hard objects, long-term zero leakage.

• Compact Structure: Ultra-short structure, lightweight, flexible installation, and easy maintenance.

• Drive Methods: Manual, pneumatic, electric, hydraulic, etc.

 

Applicable Working Conditions

 

• Mining and Metallurgy: Slurry, coal slurry, tailings, filter residue

• Power Industry: Fly ash, slag, desulfurization slurry

• Chemical Industry: Strong acids and alkalis, corrosive slurries, solid-liquid two-phase flow

• Papermaking: Pulp, black liquor, feed-water mixtures

• Environmental Protection: Sludge, sewage, mud, solid-containing wastewater

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Related Products

Concealed Plate Knife Gate Valve

Concealed Plate Knife Gate Valve

Structural Features

• Concealed valve stem: The drive screw is hidden inside the valve body/support, not exposed.

• The gate moves up and down within the valve cavity, resulting in a cleaner appearance.

• Generally a clamp-type connection, flange type is also available.

• Sealing is mostly soft seal (rubber) or hard metal seal.

• Drive methods include manual, pneumatic, and electric.

Slurry Valve

Slurry Valve

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

Polyurethane Knife Gate Valve

Polyurethane Knife Gate Valve

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

Penetration-Type Knife Gate Valve (Two-Way Sealing)

Penetration-Type Knife Gate Valve (Two-Way Sealing)

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.

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