Knife Gate Valves

Knife gate valves are engineered to cut through dense and abrasive slurries without clogging, preventing material buildup that could otherwise hinder the flow. The sharp-edged gate design slices through thick, viscous materials, ensuring smooth operation even in the most challenging conditions. This feature prevents frequent clogging, improving the efficiency of operations in industries such as mining, wastewater treatment, and pulp and paper. The valve’s design also minimizes material adhesion to internal components, further reducing maintenance needs and preventing blockages. 

Valve Type

Unidirectional or bidirectional knife gate valve for slurry, pulp, or abrasive media handling.

Flow Regulation Method

Linear throttling by moving gate across flow path, controlling medium passage effectively.

Differential Pressure Range

Operates efficiently under differential pressures up to 10 bar, depending on valve size.

Hydraulic Authority Recommendation

Best suited for low to moderate authority systems requiring full bore shut-off control.

Valve Characteristic Curve

Exhibits linear or quick opening characteristic for consistent control during valve movement.

Product Description

The valve’s design incorporates high-performance sealing systems that ensure a complete shut-off, even when dealing with hazardous or corrosive fluids. Knife gate valves maintain a tight seal under high pressures and extreme conditions, preventing leaks that could lead to environmental hazards or safety risks. This sealing capability is crucial in industries where even minor leaks can result in significant operational disruptions or regulatory penalties. The robust seal prevents material leakage during operation and at the point of shut-off, ensuring consistent and safe performance. 

Test Point Configuration

Standard port locations for pressure, flow, and leak testing during operation and maintenance.

Maximum Allowable Flow Velocity

Up to 5 m/s for liquids and 15 m/s for gases under standard conditions.

Leakage Class (per EN 12266-1)

Class A to Class D available, based on sealing element and seat design.

Body Material Options

Carbon steel, stainless steel, duplex steel, and cast iron for different service conditions.

Design Pressure Class

Commonly PN10, PN16, or ANSI Class 150 for industrial fluid handling systems.

Thermal Expansion Compatibility

Designed with seat and stem flexibility to accommodate moderate thermal expansion variances.

Installation Sensitivity

Can tolerate minor misalignments; proper alignment improves seal life and operation.

Control Accuracy

Moderate control precision suitable for on/off or throttling services in process systems.

Position Repeatability

High repeatability up to ±1% with actuator and positioner feedback integration.

Technical Advantages

Knife gate valves are built with durable materials like stainless steel and specialized alloys that resist corrosion and wear. These materials extend the operational lifespan of the valve, reducing the frequency of replacements and minimizing the total cost of ownership. With fewer maintenance requirements and extended service life, knife gate valves offer a highly cost-effective solution for industries that require continuous, reliable operation. This durability also leads to reduced downtime and operational disruptions, allowing for smoother, more efficient long-term performance. 

Knife gate valves are designed to minimize operational complexity. Their straightforward actuation systems—whether manual, pneumatic, or electric—ensure easy integration into a variety of systems. The simplicity of the valve design reduces the need for specialized training and streamlines maintenance procedures, ultimately lowering operational costs. The ease of operation reduces the risk of human error and enhances system reliability. With fewer moving parts, these valves offer greater reliability and reduced wear, leading to enhanced operational efficiency and cost savings over time. 

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Industry Applications

Pulp and Paper

Employed for controlling fibrous slurries in paper mills, cutting through high-viscosity pulp to maintain consistent flow without blockages.

Chemical Processing

Ideal for handling corrosive and abrasive chemicals, providing leak-tight isolation and minimizing material degradation in high-pressure systems. 

Power Generation

Used in coal handling and ash removal systems to control high-density slurries, ensuring reliable isolation under demanding thermal conditions. 

Food and Beverage

Handles viscous food products, slurries, and pulps, ensuring smooth flow control without contamination or degradation of the material. 

Oil and Gas

Utilized for controlling slurries and fluids in pipeline and extraction systems, offering effective isolation and minimal maintenance under high pressures.

Pharmaceutical

Provides tight shut-off for handling active ingredients and chemical slurries in processing environments, maintaining sterile conditions and preventing cross-contamination.

Minimal Maintenance Requirements

Knife gate valves require significantly less maintenance compared to other valve types, thanks to their robust construction and efficient sealing mechanisms. The design reduces the occurrence of wear on internal components, resulting in fewer maintenance interventions. Their advanced sealing materials minimize the risk of leakage and ensure longevity, further reducing maintenance needs. 

Knife gate valves provide versatile solutions that can be customized to fit a wide range of industries. Whether dealing with corrosive chemicals, high-viscosity liquids, or abrasive slurries, these valves offer reliable performance. Their adaptability to diverse applications—such as mining, power generation, wastewater treatment, and chemical processing—ensures they can meet the specific needs of various sectors. 

Knife Gate Valves

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Check all our Frequently Asked Question

How do Frigate's knife gate valves ensure reliable performance in high-temperature environments?

Frigate’s knife gate valves are designed with high-temperature resistant materials such as stainless steel and alloys that provide thermal stability. The gate is engineered to maintain tight sealing even under extreme heat, preventing leaks. Advanced sealing technology and heat-treated components extend the valve’s lifespan under continuous high-temperature operation. These design features ensure consistent performance in industries such as power generation and steel manufacturing.

What makes Frigate's knife gate valves suitable for handling abrasive slurries in the mining industry?

Frigate’s knife gate valves utilize hardened materials like tungsten carbide and specialized coatings, making them highly resistant to abrasive slurries. The sharp-edged gate design ensures that thick slurries are efficiently cut and flow is not obstructed. Additionally, the valve body is reinforced to withstand the wear caused by continuous interaction with abrasive particles. This combination of features reduces maintenance and improves operational efficiency in mining and mineral processing.

How does Frigate’s knife gate valve minimize maintenance in wastewater treatment plants?

Frigate’s knife gate valves feature a robust design with self-cleaning mechanisms that minimize the accumulation of solids and sludge. The materials used, including corrosion-resistant alloys, ensure that the valves perform well in harsh wastewater environments. The simple yet effective actuator mechanism reduces the need for frequent adjustments or replacements. This results in lower maintenance costs and fewer service disruptions in wastewater treatment facilities.

What is the advantage of Frigate’s knife gate valves in handling corrosive chemicals in the chemical processing industry?

Frigate’s knife gate valves are made from premium corrosion-resistant materials like duplex steel and PTFE seals, offering reliable performance in the chemical industry. The design allows for precise control over hazardous, corrosive fluids while maintaining a leak-tight seal. This minimizes the risk of contamination or fluid loss, which is critical in chemical processing. Frigate’s valves are engineered to withstand aggressive chemicals without compromising safety or reliability.

How do Frigate's knife gate valves help in reducing operational downtime in heavy-duty applications?

Frigate’s knife gate valves are designed with high-strength materials and precise engineering, allowing them to handle harsh environments with minimal wear. Their rugged construction ensures they are less prone to failure, reducing the need for frequent repairs. Additionally, Frigate’s valves are easy to maintain, with straightforward designs that allow for quick part replacements. These factors combined result in reduced operational downtime in industries like power generation and steel production.

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LOCATIONS

Global Sales Office

818, Preakness lane, Coppell, Texas, USA – 75019

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

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Knife Gate Valves

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