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
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.
Contact one of our specialists about your specific needs. We aim to respond to your message on the same or next business day.
Knifegate Valve Products
Valve Details
| 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 |
Valve Details
| 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 |
- |
Valve Details
| 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.
- Coming Doon, Enquire for details.
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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Read Article >Frequently Asked Valve Questions
If would like to know more, please get in touch and we’ll be happy to answer your questions.
What are Knife Gate Valves?
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.
How Do Knife Gate Valves Work?
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.
What Materials are Used for Knife Gate Valves?
Typically made from robust materials like stainless steel or ductile iron, these valves are designed to withstand harsh conditions, including corrosive or abrasive flows.
Can Knife Valves Be Used for Throttling?
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.
How Are Knife Gate Valves Maintained?
Maintenance involves regular cleaning to prevent build-up, routine inspections for wear and damage, and lubrication of moving parts to ensure smooth operation.
Difference Between Knife and Standard Gate Valves?
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.
Are Knife Valves suitable for High-Pressure Applications?
They are typically used in low to medium pressure environments due to their design, which is not optimal for handling high pressure.
Can Knife Valves Handle of Abrasive Materials?
Their robust construction and sharp gate make them effective in handling abrasive materials without significant wear and tear.
Can Knife Valves Be Used in the Food Industry?
Yes, when manufactured with the appropriate materials and design, they are suitable for use in the food and beverage industry.
What Sizes Do Knife Gate Valves Come In?
Available in a range of sizes, typically from DN 50 to DN 1200, to suit various pipeline dimensions and flow requirements.
