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Difference between wafer gate valve and gate valve
Release Date:
2025-07-31
The flat gate valve, featuring parallel gate plates, low flow resistance, and pigging advantages, is suitable for long-distance transmission pipelines; the wedge gate valve, with its wedge-shaped structure providing forced sealing, is more suitable for high-pressure, high-temperature clean conditions.
The core differences between flat gate valves and ordinary gate valves (mainly wedge gate valves) are as follows:
Gate plate structural differences
Flat gate valve: The gate plate consists of two flat plates parallel to the direction of the medium flow, with sealing surfaces parallel to the pipeline centerline. During opening and closing, the gate plate remains in contact with the valve seat at all times. Some designs include flow guide holes to enable pipeline cleaning functions.
Ordinary gate valve (wedge type): The gate plate is wedge-shaped (V-shaped), with sealing surfaces angled relative to the pipeline centerline, relying on wedge force to achieve sealing.
Differences in sealing principles
Flat gate valve:
Bidirectional sealing: Relies on medium pressure to push the gate plate (or spring/expansion mechanism) against the valve seat, forming a double seal.
Self-cleaning: The sealing surfaces scrape off impurities during opening and closing, and the flow guide hole design prevents particles from entering the valve cavity.
Wedge gate valve:
Forced sealing: The stem thrust increases the normal force on the wedge surface, making sealing more reliable under high temperature and high pressure;
Prone to jamming: Thermal expansion/contraction or impurity accumulation may cause the gate plate to jam.
Special design comparison
Flow guide hole: Only present in flat gate valves, enabling pigging and stable flow of the medium;
Grease injection structure: Flat gate valves can inject sealing grease to repair damaged sealing surfaces, while wedge gate valves do not have this function.
Flat gate valves, with parallel gate plates, low flow resistance, and pigging advantages, are suitable for long-distance transmission pipelines; wedge gate valves, with forced sealing from the wedge structure, are more suitable for high-pressure, high-temperature clean conditions.
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