Showing the single result

Uni Directional Knife Gate Valve

South American Valve is a leading Uni Directional Knife Gate Valve Supplier in Bolivia. A unidirectional knife gate valve is a type of valve designed specifically for handling thick, viscous fluids, or fluids with high solid content, such as slurry, wastewater, or pulp. It is called “unidirectional” because it allows flow in only one direction and provides a tight seal to prevent backflow. The construction of a unidirectional knife gate valve typically consists of a sharp-edged blade or gate that moves perpendicular to the flow direction to control the fluid flow. The gate is usually made of stainless steel or other durable materials to withstand the harsh conditions of the process.

The valve body is usually a cast metal or fabricated steel structure with a port or opening where the gate can move up and down. When the gate is in the closed position, it creates a tight seal against the valve seat, preventing any flow through the valve. The operation of a unidirectional knife gate valve involves the use of an actuator, such as a handwheel, pneumatic cylinder, or electric motor, to move the gate. When the actuator is engaged, it raises the gate, allowing the fluid to pass through the valve. To close the valve, the actuator lowers the gate, creating a seal against the seat.

South American Valve is a leading  Uni Directional Knife Gate Valve Supplier in Bolivia. The design of the gate and seat of a unidirectional knife gate valve is such that it minimizes the risk of clogging or trapping of solids in the valve during operation. This makes it particularly suitable for applications where slurry, suspended solids, or other challenging fluids need to be controlled. Unidirectional knife gate valves are commonly used in industries such as mining, wastewater treatment, power generation, chemical processing, and pulp and paper manufacturing. They are favored for their ability to handle abrasive and corrosive fluids while providing reliable shut-off and flow control capabilities.


  • Excellent Shut-Off Capability: Unidirectional knife gate valves provide a tight seal when closed, preventing any backflow or leakage. The sharp-edged gate design and tight sealing mechanism ensure reliable shut-off even in high-pressure or high-solids applications, reducing the risk of process disruptions or environmental concerns.
  • Handling of Viscous and Solid-Laden Fluids: These valves are specifically designed to handle thick, viscous fluids and fluids with high solid content, such as slurry or pulp. The robust gate construction and large flow area allow for effective passage of challenging fluids, minimizing the risk of clogging or blockages in the valve.
  • Corrosion and Abrasion Resistance: Unidirectional knife gate valves are typically constructed from materials that offer excellent corrosion and abrasion resistance, such as stainless steel or cast iron with corrosion-resistant coatings. This ensures the valves can withstand the corrosive or abrasive nature of the fluids being handled, extending their service life and reducing maintenance requirements.
  • Compact Design: Knife gate valves have a compact design, making them suitable for applications with limited space or installation constraints. They can be easily integrated into existing piping systems, reducing the need for extensive modifications or space requirements.
  • Easy Maintenance and Replacement: Knife gate valves are designed for easy maintenance and replacement of components. The gate and seat can be easily accessed and replaced, minimizing downtime during maintenance activities. This enhances the overall operational efficiency and reduces maintenance costs.
  • Cost-Effective Solution: Unidirectional knife gate valves often offer a cost-effective solution compared to other valve types for applications involving viscous or solid-laden fluids. Their robust design, long service life, and low maintenance requirements contribute to reduced lifecycle costs.
  • Versatile Actuation Options: Knife gate valves can be actuated using various methods, including handwheels, pneumatic cylinders, or electric motors, providing flexibility in operation and control. The choice of actuation allows for efficient and precise fluid flow regulation based on specific process requirements.
  • Wide Range of Applications: Unidirectional knife gate valves find applications in diverse industries, including mining, wastewater treatment, pulp and paper, chemical processing, power generation, and more. Their versatility and capability to handle challenging fluids make them suitable for a wide range of processes.


  • Mining and Minerals: Knife gate valves are used in mining operations for handling abrasive slurries, tailings, and mineral concentrates. They can handle high-pressure and high-temperature applications, making them suitable for mine dewatering, slurry transport, and concentrate thickening.
  • Wastewater Treatment: In wastewater treatment plants, knife gate valves are used for controlling the flow of sludge, sewage, and other waste materials. They are often used in processes such as sludge dewatering, grit handling, and clarifier underflow control.
  • Pulp and Paper: Knife gate valves are used in the pulp and paper industry for handling pulp, paper stock, and other fibrous materials. They are commonly found in applications like pulp screening, stock preparation, and wastewater treatment in paper mills.
  • Chemical Processing: Knife gate valves are employed in chemical processing plants where corrosive or abrasive fluids need to be controlled. They are used for handling chemicals, acids, corrosive slurries, and other challenging substances in processes such as chemical dosing, mixing, and filtration.
  • Power Generation: In power plants, knife gate valves are utilized for controlling the flow of ash slurry, coal slurries, and bottom ash. They are commonly found in applications like ash handling systems, coal-fired boilers, and flue gas desulfurization (FGD) processes.
  • Food and Beverage: Knife gate valves can be used in the food and beverage industry for handling viscous food products, such as sauces, pastes, and pulps. They are employed in processes like food processing, dairy production, and fruit and vegetable processing.
  • Petrochemical and Refining: Knife gate valves are suitable for handling heavy oils, petroleum slurries, and refinery waste streams in petrochemical and refining plants. They are used in processes like tank bottom drainage, catalyst handling, and sludge disposal.
  • Construction and Dredging: Knife gate valves are utilized in construction projects and dredging operations for handling sand, gravel, and other sediments. They are commonly used in processes like sediment control, slurry pipelines, and dredge spoil disposal.


  • Body: Carbon Steel, Ductile Iron, SS316
  • Knife: SS304, SS316
  • Disc: SS304, SS316L
  • Wedge: SS304, SS316, SS316L
  • Packing: PTFE
  • Seal Ring: Polyurethane, EPDM, NBR, VITON
  • Yoke: SS304, SS316
  • Packing Gland: CF8, WCB
  • Nominal Size: DN50 to DN450
  • Nominal Pressure: Class150 to Class30, PN10
  • End Type: Wafer Type, Lug Type
  • Operation: Handwheel, Electric Actuated, Pneumatic Actuated


  • Body
  • Gate
  • Seat
  • Stem
  • Actuator
  • Bonnet