The difference between knife gate valve and ordinary gate valve

secureluokai June 19, 2025

I. Working Nature
Knife Gate Valve
Definition: A high-pressure quick-cutoff valve designed for instantaneous shut-off of pipeline fluids in emergency situations, hence also known as a “quick shut-off valve”.
Functional Features: Primarily used to rapidly cut off gases, liquids, and other media in pipelines, serving as a critical safety component for pipeline systems.
Common Gate Valve
Definition: A general-purpose pipeline valve mainly used for controlling fluid flow and regulating flow rates.
Functional Features: Lacks quick-cutoff design; achieves flow regulation through the lifting of the valve disc, suitable for conventional flow control scenarios.
II. Structural Characteristics
Knife Gate Valve
Structural Components: Composed of a valve body, blade-shaped disc, and transmission device, with a simple and compact design.
Technical Advantages:
The blade-shaped disc quickly cuts through the medium flow during shut-off, ensuring excellent sealing performance;
Integrates both cutoff and flow control functions, suitable for precise operations under high-pressure conditions.
Common Gate Valve
Structural Components: Includes a valve body, bonnet, disc (disc-shaped or cylindrical), and transmission device, with a relatively complex structure.
Technical Features:
The disc adjusts the flow area by lifting, enabling stepwise flow control;
Moderate sealing performance, but high long-term operational reliability due to stable structure.
III. Application Scenarios
Knife Gate Valve
Applicable Scenarios:
High-pressure emergency cutoff scenarios: Such as gas transmission pipelines, high-pressure steam networks, etc., to quickly block media and prevent leakage or accident escalation;
Precise flow control scenarios: Used in chemical, petroleum, and other industrial process pipelines due to its good sealing and regulation capabilities.
Common Gate Valve
Applicable Scenarios:
Conventional flow regulation fields: Such as water treatment pipelines, compressed air systems, and other scenarios with no special requirements for cutoff speed;
Economic Advantages: Widely used in municipal, building water supply/drainage, and other civil/industrial fields due to mature structure and low cost.
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