Wafer-Type Knife Gate Valve
Features: The valve itself has no flanges. Long bolts are inserted through mounting holes in the valve to "clamp" the valve between two pipe flanges.
Advantages: Shortest length, lightest weight, and lowest cost.
Disadvantages: Disassembly and maintenance require the removal of bolts at both ends of the pipe.
Applications: The most commonly used connection method, suitable for pipelines with tight space.
Flanged Knife Gate Valve
Features: Flanges are built into both ends of the valve body and bolted to the pipe flange.
Advantages: Stable connection, reliable seal, and easy disassembly and maintenance.
Disadvantages: Length and weight are greater than wafer-type valves, leading to higher cost.
Applications: Large-diameter, high-pressure pipelines, or where frequent disassembly is required.
Bevel Gear Knife Gate Valve
Note: Bevel gears are a type of actuation (a manual type, but less labor-intensive), not a connection method. They are often combined with flanges or wafer connections for larger-diameter valves, making operation easier.
Welded Knife Gate Valve
Applications: For permanent, leak-proof pipe connections.
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