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Knife Gate Valves

Knife gate valves operate on a simple yet effective mechanism. Their primary role is to release trapped air or admit air into the water system, maintaining the right pressure and flow

Introduction

Knife Gate Valves by John Valves

Knife gate valves, as part of John Valves’ extensive product range, are designed for efficiency and durability in challenging industrial environments. These valves are ideal for applications involving thick media, such as slurry and viscous fluids, owing to their ability to cut through such materials easily.

They cater to diverse industrial needs with options in materials like stainless steel and ductile iron. Our valves come in various designs, including semi-lugged or fully-lugged bodies, and feature resilient or metal-seated options to suit different operational requirements.

Available in multiple sizes, from DN 50 to DN 1200, and capable of handling pressures up to PN 10, John Valves’ knife gate valves are engineered for precision and robust performance, ensuring long-term reliability for your industrial processes.

Product or Sales Enquiry

Contact one of our specialists about your specific needs. We aim to respond to your message on the same or next business day.

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Knifegate Valve Products

Knifegate Valve

JOHN FIG 79

Knife Gate Valve
Item Details
Body Material
Cast Ductile Iron
Body Coating
-
Trim
316 Stainless Steel, EPDM
Pressure Range
PN2-PN10 (Higher Available)
Size Range
DN80-DN1500
Flange Connection
AS4087 / AS2129 Table E / ANSI / Others
End Connection
-
Options
Pneumatic / Electric Actuators / Chainwheel / Shaft Extension / Seat Materials
Knifegate Valve

JOHN FIG 78

Knife Gate Valve
Item Details
Body Material
Stainless Steel (CF8M)
Body Coating
-
Trim
316 Stainless Steel, EPDM
Pressure Range
PN2-PN10
Size Range
DN2-DN1600
Flange Connection
AS4087 / AS2129 Table E / ANSI
End Connection
-
Options
-
Knifegate Valve

JOHN FIG 77

Knife Gate Valve
Item Details
Body Material
Cast Iron
Body Coating
FBE Coated
Trim
316 Stainless Steel, EPDM
Pressure Range
PN3-PN10
Size Range
DN50-DN1600
Flange Connection
AS4087 / AS2129 Table E / ANSI
End Connection
Pneumatic / Electric Actuators / Chain Wheel / Shaft Extension / Seat Material
Options
-

Knife Gate Valve Technical Sheets

Our commitment to the industry to supply quality knife gate valves, we have made these technical sheets available. If you need further information please make a technical enquiry. 

Knife Gate Advantages

Cutting Ability
The gate’s sharp edge handles viscous and abrasive materials, making it ideal for applications like pulp and paper, mining, and wastewater treatment.

Low Pressure Drop
When fully open, the gate is completely out of the flow path, significantly reducing fluid resistance and maintaining steady flow.

Bidirectional Sealing
This feature allows the valve to seal under pressure from both directions, offering greater flexibility in system design.

Compactness
Their design takes up less space, making them suitable for systems with limited room.

Versatility
They are effective in various settings, including slurry, dry bulk, and powder applications.

Ease of Maintenance
The straightforward design simplifies repairs and replacements, reducing downtime and maintenance costs.

Industry Uses

John Valves’ air valves are essential in various industries and are known for their reliability and precision. These valves, from municipal water systems and wastewater treatment to agriculture and industrial processes, ensure efficient, safe fluid management. This introduction highlights how our air valves meet the unique challenges across various sectors, demonstrating their versatility and importance in enhancing operational efficacy.

Pulp and Paper Industry

Essential for handling pulp mixtures and controlling the flow of paper slurry, where their cutting action is beneficial for dealing with fibrous materials.

Mining and Mineral Processing

Used for thick, abrasive slurries common in mineral extraction processes. Their robust design is ideal for the harsh conditions of mining operations.

Wastewater Treatment

Effective in controlling the flow of sludge and waste, particularly useful in applications where solids are suspended in liquid.

Chemical Industry

Their ability to handle corrosive and abrasive flows makes them suitable for various chemical processing applications.

Food and Beverage Industry

Utilised in processes requiring hygienic conditions, especially for viscous products or where solids are present in liquids.

Power Plants

Invaluable in ash handling systems, where their durability and ability to handle abrasive materials are crucial.

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Frequently Asked Valve Questions

If would like to know more, please get in touch and we’ll be happy to answer your questions.

Knife gate valves are specialised valves used for controlling the flow in systems that handle materials like slurry, pulp, or wastewater. Their design enables them to cut through such materials effectively.

These valves have a gate that moves vertically to start or stop the flow. The gate’s sharp edge allows it to cut through solid-containing media, making it ideal for viscous fluids.

Typically made from robust materials like stainless steel or ductile iron, these valves are designed to withstand harsh conditions, including corrosive or abrasive flows.

They are not ideal for throttling as the partial opening can cause damage to the gate and the seat, leading to rapid wear and tear.

Maintenance involves regular cleaning to prevent build-up, routine inspections for wear and damage, and lubrication of moving parts to ensure smooth operation.

Unlike standard gate valves, knife gate valves have a sharpened edge on the gate to slice through solid materials, making them more suitable for specific types of media.

They are typically used in low to medium pressure environments due to their design, which is not optimal for handling high pressure.

Their robust construction and sharp gate make them effective in handling abrasive materials without significant wear and tear.

Yes, when manufactured with the appropriate materials and design, they are suitable for use in the food and beverage industry.

Available in a range of sizes, typically from DN 50 to DN 1200, to suit various pipeline dimensions and flow requirements.