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Knife Gate Valve

Knife Gate Valve

African Valve is a renowned Knife Gate Valve Manufacturer in South Africa, offering robust and compact valves built to handle viscous, corrosive, and solid-laden media. Our knife gate valves are ideal for tight shutoff in slurry, wastewater, and pulp applications, thanks to their sharpened gate edge that cuts through thick fluids and media with high solids content.

Function & Working

Knife gate valves operate by lifting a sharp-edged gate vertically to control the flow. When open, the gate is fully withdrawn from the flow path, minimizing pressure drop. Upon closing, the blade slices through media, ensuring a tight seal. This makes them particularly effective in systems where clogging or media buildup is a concern.

Advantages

  • Efficient shut-off in thick and slurry-type media

  • Minimal pressure drop in full-open position

  • Low operating torque requirements

  • Compact design suitable for tight spaces

  • Easy maintenance with replaceable seats and seals

Types Offered

  • Unidirectional Knife Gate Valve

  • Bi Directional Knife Gate Valve

  • Slurry Knife Gate Valve

  • Flanged Knife Gate Valve

  • Through Conduit Knife Gate Valve

Industries Served

  • Mining and Mineral Processing

  • Wastewater Treatment Plants

  • Paper and Pulp Industry

  • Food and Beverage

  • Power Plants

  • Cement and Steel Plants

  • Chemical Slurry Applications

Key Components

  • Gate Blade – Sharp stainless steel disc to cut through thick or fibrous media

  • Body – Cast or fabricated in corrosion-resistant alloys

  • Seat Rings – Replaceable elastomer or metal for tight shut-off

  • Stem – Rising or non-rising design depending on installation space

  • Packing Gland – Prevents external leakage around the stem

  • Actuator Mount – Supports manual or automated operation

Technical Specifications

  • Design Standards: MSS SP-81, TAPPI TIS 405-8, ISO 9001

  • Body Materials: WCB (ASTM A216), CF8 (SS304), CF8M (SS316), Cast Iron, Duplex, Super Duplex, Alloy 20, Hastelloy, Inconel

  • Trim Options: SS304, SS316, EPDM, NBR, PTFE, Stellite

  • Pressure Ratings: Class 150 to 600 / PN6 to PN100

  • Size Range: DN50 to DN1200

  • End Connections:

    • Flanged (Drilled to ANSI, DIN, or JIS standards)

    • Lugged (For precise alignment and bolting)

    • Wafer type (Compact and lightweight installation)

  • Actuation Options: Manual handwheel, pneumatic cylinder, electric actuator, or hydraulic actuator

  • Special Features:

    • Full bore, low-turbulence design

    • Resilient or metal seats

    • Dust boots for stem protection

    • Designed and tested by a leading Knife Gate Valve Manufacturer in South Africa

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