Knife gate valve is a valve that realizes medium cutoff or flow control through the vertical movement of knife-type gate plate. Its core functions include:
Quickly cut off fluid: The knife-shaped gate can be closed quickly to achieve emergency cutoff or maintenance isolation to prevent leakage (such as emergency response to chemical accidents);
Processing complex media: The sharp blade of the gate can cut off impurities such as fiber, pulp, slag and other impurities, and is suitable for media containing solid particles (≤60% solid content), high viscosity or corrosive media;
Adjust flow and pressure: Adjust the flow by controlling the opening of the gate and assist in stabilizing the pressure of the pipeline system
Applications
| Industry | Applications | Applicable media examples |
|---|---|---|
| Mining and Metallurgy | Coal preparation in mines, tailings discharge, metal powder transportation | Ore slurry, tailings, coal slime, metal slag slurry |
| Environmental Engineering | Sewage treatment plant slurry pipeline, sedimentation tank sewage, wastewater treatment system | Sludge, wastewater containing suspended matter, fiber impurities |
| Papermaking Industry | Pulp transportation, waste pulp treatment | High-concentration pulp, wood pulp, waste pulp |
| Chemicals and Energy | Acid and alkali solution transportation, power station ash removal system, petrochemical pipeline | Corrosive liquids, ash slurries, oil products containing particles |
| Food and medicine | Conveying of viscous materials (such as jam, syrup), pharmaceutical raw material pipelines | High viscosity fluid, sterile media |
Performance advantages
Anti-clogging ability: Full-bore straight-through flow channel design (DN50~DN1200), the gate cuts impurities to avoid pipeline blockage; Low flow resistance characteristics: When opened, the gate is completely separated from the flow channel, and the fluid resistance is only 30% of the traditional valve, which is suitable for large flow delivery; High sealing: Elastic rubber (EPDM, NBR) or metal hard seal, leakage rate ≤10⁻⁶ mbar·l/s, meeting harsh working conditions; Convenient maintenance: Simple structure, fast disassembly and assembly, low replacement cost of wearing parts (such as sealing rings).
Selection points
Medium characteristics: Metal hard seals are selected for hard particles, and stainless steel valve body + fluororubber seals are selected for corrosive media; Working parameters: High temperature (＞150℃) requires metal composite seals, and high pressure (PN16) requires reinforced valve body structure; Drive mode: Small diameter (DN≤300) can be manually operated, and large diameter or automation system requires electric/pneumatic actuators.
Knife gate valves have become the core control equipment for complex media pipelines due to their strong adaptability, widely covering the needs of cutting off, regulating and safety protection in industrial processes.】
