Export Office: 21Floor, No.5 Nanhai Zhi Road,Qingdao, Shandong ,China
Work Shop: Beian Industrial zone, Qingdao,Shandong,China
+86 532 88550858
Martin
Knife gate valves, also known as slurry gate valves or knife-type slurry valves, are essential components in industrial fluid control systems. Their unique design and excellent performance make them indispensable in handling complex working conditions across various industries.
Hard-seal Knife Gate Valve
These valves use metal sealing surfaces such as stainless steel or hard alloys. They offer high hardness and wear resistance and are suitable for high-temperature, high-pressure, and corrosive media environments.
Soft-seal Knife Gate Valve
Soft seals use elastic materials like rubber or PTFE. They provide excellent elasticity and sealing performance to prevent leakage effectively and are ideal for applications with high sealing requirements.
Manual Knife Gate Valve
Operated manually via a handwheel or lever. These are simple to operate and cost-effective but require more labor effort, making them suitable for small pipelines or systems with infrequent operation.
Electric Knife Gate Valve
Driven by an electric motor through a control system for remote operation. These valves offer convenience and a high level of automation, ideal for large-scale systems requiring frequent actuation.
Pneumatic Knife Gate Valve
Powered by compressed air using pneumatic actuators. They feature fast response times and high reliability, suitable for flammable, explosive, high-temperature, or high-pressure environments.
Hydraulic Knife Gate Valve
These utilize hydraulic cylinders for actuation and deliver strong output force with smooth operation. They are best suited for large-diameter or high-pressure pipelines.
Parallel Knife Gate Valve
The gate plate moves vertically between parallel sealing surfaces. This structure is simple and easy to manufacture but has relatively lower sealing performance. It is used in low-pressure large-diameter pipelines.
Wedge Knife Gate Valve
The wedge-shaped gate enhances sealing by tightening against the seat. These valves provide superior sealing performance suitable for medium to high-pressure systems.
In the closed position, the gate plate lies within the valve body tightly pressed against the seat using its wedge-shaped bottom edge to block fluid flow completely. The stem moves downward through the actuator mechanism increasing contact pressure on the seat surface to enhance seal integrity.
To open the valve, the actuator raises the stem which lifts the gate away from the seat gradually opening up fluid passageways without significantly impeding flow due to its streamlined knife-like design.
Knife gate valves serve critical roles across multiple industries; in pulp and paper production, they cut through fibrous pulp and manage wastewater, while in petrochemical plants, they withstand corrosive, pressurized fluids. The mining industry relies on their wear resistance and self-cleaning action for abrasive slurries, and municipal drainage systems use them for rapid flow control of stormwater and sewage to mitigate floods. Furthermore, they meet the hygienic demands of food and beverage processing with easy-clean designs and ensure continuous operation in power plants by handling extremely abrasive fly ash in ash handling systems.
Made from cast steel, iron, or stainless steel. It’s strong against inside pressure. It holds all parts safely in exact-made spaces. Flanged ends connect to pipes easily.
Shaped like a blade with slanted edges. It cuts through thick liquids easily. Materials can be carbon steel for normal use or stainless/alloy steels for harsh or rough settings.
Connects the actuator to the gate. It moves the gate up and down. Usually made of stainless steel for strength and rust protection, even in tough pipe liquids.
Has seat rings (rubber, PTFE, or metal) and packing glands with graphite, asbestos, or PTFE. These stop leaks at the stem and keep the valve strong in hot or cold changes.
Options include handwheels (simple), electric motors (automatic), pneumatic cylinders (quick), or hydraulic pistons (strong). You pick based on how often it’s used, safety, or load needs.
As a leading manufacturer specializing in steel valves since 1994, FLUIDO provides custom-made knife gate valve solutions tailored precisely to your technical requirements—from material selection through actuation design—backed by ISO9001-certified quality assurance systems and CE-approved product lines exported globally across 35+ countries/regions worldwide. Contact us today at info@fluidovalve.com for your free quote!
