Electric Actuated Knife Gate Valves Description
Electric knife gate valve is a valve that uses an electric actuator to drive the gate to move vertically. Its opening and closing parts are knife-shaped or wedge-shaped gates. The movement direction is perpendicular to the fluid flow direction. It is only used for full-open or full-closed fluid cutoff control and cannot adjust the flow.
Structural composition Core components Valve body: Usually chamber-free design, made of cast iron, stainless steel or alloy steel, to enhance pressure resistance and corrosion resistance. Gate plate: Knife-shaped or wedge-shaped structure, the bottom is designed to be blade-shaped (5°-50° wedge angle), which can cut off fibers, slurries and other media; the elastic gate can be slightly deformed to adapt to the deviation of the sealing surface. Seal assembly: The sealing surface is made of carbide surfacing or elastic materials (such as O-rings), and some models support bidirectional sealing. Electric actuator: Integrated motor, deceleration mechanism and control module to achieve remote automated operation.
Auxiliary design
The valve stem surface is hardened (such as hard chrome plating) to prevent wear; some models are equipped with an anti-blowout valve stem structure to improve safety.
Working principle
Opening and closing process: The electric actuator drives the valve stem to rise and fall vertically, driving the gate and the valve seat to fit (close) or separate (open), cutting off or conducting the medium.
Sealing mechanism:
Self-sealing: When closed, the medium pressure presses the gate against the valve seat to form a seal (suitable for low-pressure scenarios).
Forced sealing: Relying on external driving force (such as electric actuator) to press the gate and the valve seat (suitable for high-pressure or high-precision scenarios)
Electric Knife Gate Valves specification
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Item |
Electric Knife Gate Valves | ||
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Applicable Standards |
GB, DIN, ANSI, ASME, JIS, API |
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Size Range |
DN15 to DN200 |
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Operating Pressure |
10bar, 16bar, 20bar, 40bar, 64bar, Class 150, Class 300 |
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Body Material |
Stainless Steel 304/316/316L |
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Temperature Of Media Normal Type |
-22℉ to 356℉ |
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High-Temperature Type |
-22℉ to 842℉ |
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End Connection |
Flange |
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Gate Valve Body Design Standard |
API600 / DIN3352 / KS B2361 / GB/T 12234 |
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Suitable Media |
Water, Air, Oil, Gas, Steam, Pulp, etc. |
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Voltage |
DC-12V, 24VAC-24V, 110V, 220V, 380V |
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Actuator Type |
ON OFF Type, Modulating Type or Intelligent Type |
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Application |
Food & Beverage, Water & Wastewater, Ultra Pure Water, Desalination, Chemical, Textile, Pharmaceutical, Pulp & Paper, Mining, Boiler and Power Industries |
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Electric Actuated Knife Gate Valves
Pain points and solutions
Challenges of high wear and corrosive media
Pain points: Traditional valves are prone to wear and leakage in slurry and corrosive media.
Solutions: Use carbide sealing surfaces, PTFE coatings or all-metal structures to improve wear resistance and corrosion resistance.
Blocking problems with particle/fiber media
Pain points: Fibers and solid particles can easily cause valves to get stuck or seal failure.
Solutions: The knife-type gate design can cut fibers and scrape the sealing surface to keep the flow channel unobstructed.
Sealing requirements under high pressure and high temperature environments
Pain points: High temperature and high pressure conditions increase the risk of deformation of the sealing surface.
Solutions: Optimize the wedge angle design (such as elastic valve seats), disperse the pressure load, and ensure sealing reliability under high temperature.
Automation and remote control requirements
Pain points: Manual operation is inefficient, and remote intervention is required in high-risk environments.
Solution: Integrate electric actuators to support remote centralized control and automatic adjustment (such as flow and pressure parameters), and improve the intelligence level of industrial systems. Maintenance costs and downtime losses
Pain points: Frequent valve failures lead to production line stagnation. Solution: Modular design simplifies the disassembly process, and wear-resistant materials reduce maintenance frequency and reduce comprehensive use costs.
Applications
Environmental protection and sewage treatment: Cut off sewage containing fiber and solid impurities to prevent pipeline clogging.
Mining and metallurgy: Control the transportation of high-viscosity or particle-containing media such as slurry and mud.
Chemical and food industry: Sanitary design for corrosive media or high-cleanliness fluid management (must meet material certification standards).
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