What is Electric Wafer Butterfly Valve
Aug 15, 2025
Core Structure and Working Principle
The electric wafer butterfly valve consists of an electric actuator mechanically connected to a wafer butterfly valve body, designed with lightweight and compactness as core principles56.
Electric Actuator
Receives control system signals (e.g., 4–20 mA current or 0–10 V voltage) to drive the motor, transmitting rotational motion to the valve stem via gears or worm gear mechanisms for 0°–90° rotation control614.
Equipped with position feedback devices for real-time monitoring of stem position and ensuring opening precision. Certain models support Modbus protocol for remote monitoring and diagnostics615.
Wafer Butterfly Valve Body
Soft Sealing:
Sealing rings embedded around the valve body or disc use materials like Nitrile Rubber (–40℃ to 90℃) or Fluorocarbon Rubber (–20℃ to 200℃), suitable for low-pressure media such as water/air715.
Metal Hard Sealing:
Triple-offset structure employs valve seats and discs made of stainless steel with varying hardness (e.g., cobalt-based hard alloy welding), resisting wear and high temperatures (≤425℃) for steam/oil applications69.
Bidirectional sealing capability meets Leakage Class VI standards911.
Disc:
Mounted along the pipeline diameter; rotates about its axis (90° rotation for full opening). Disc thickness is the sole source of flow resistance, with a drag coefficient <0.3, saving 15%–20% energy compared to gate valves1115.
Valve Body:
Cylindrical channel design eliminates internal bolts/links, reducing media stagnation risk.
Wafer connection allows direct installation between pipeline flanges without additional supports56.
Performance Advantages: Efficiency, Reliability, Adaptability
Rapid Actuation & Precise Control
90° rotation completes opening/closing (adjustable action time: 15–60 seconds). Supports analog (4–20 mA/0–10 V) and digital signals for DCS integration614.
Actuators feature overload protection and manual override for power failures614.
Low Flow Resistance & High Flow Capacity
Minimal pressure drop and high linearity in flow control, ideal for large-diameter pipelines (DN50–DN1200)1115.
Compact Structure & Easy Maintenance
30%–50% lighter than flange-type valves, installable in any orientation56.
Modular design simplifies disassembly. Key maintenance:
Inspect sealing surface wear; replace soft seals every 3 years.
Clear scaling from metal sealing surfaces periodically714.
High-Temperature & Corrosion Resistance
Triple-offset metal seals endure ≤100,000 cycles with near-zero friction911.
Valve materials (carbon steel/stainless steel/ductile iron) and nickel-alloy hard seals resist corrosive media (e.g., acids/alkalis)614.
Typical Applications
Building Materials Industry
Controls dust-laden hot gases (≤300℃) in cement kiln exhaust systems14.
Metallurgical Industry
Rapid shutoff for blast furnace cooling water circuits (≤2.5 MPa pressure)13.
Power Industry
Manages corrosive flue gas (≤300℃) in coal-fired plant desulfurization systems. Sealing tests: 1.1×PN; strength tests: 1.5×PN14.
Mining Scenarios
Ventilation systems for dusty air regulation, leveraging bidirectional sealing to prevent backflow11.
Municipal Engineering
Wastewater treatment aeration systems (≥DN300) for energy-efficient airflow control1315.
Key Selection Parameters
Nominal Diameter (DN)
Range: DN50–DN1200. Large diameters (≥DN400) use segmented discs to reduce torque by 30%1415.
Pressure Rating (PN)
Common grades: PN0.6/1.0/1.6/2.5 MPa (e.g., Model D973H-6C: max. 0.6 MPa)614.
Temperature Range
Soft seals: NBR (–40℃ to 90℃), FKM (–20℃ to 200℃)7.
Metal seals: ≤425℃ (special materials: ≤650℃)911.
Media Compatibility
Corrosive media: Stainless steel body + nickel-alloy seals (e.g., PTFE-lined D971F46 for strong acids/alkalis)815.
Particulate-laden media: Abrasion-resistant rubber (NBR) or hard metal seals1113.
Control Mode
On/Off type: Simple open/close (e.g., D971X-16Q soft-seal valve)7.
Modulating type: 4–20 mA signal for proportional flow control (e.g., D973H-16P smart hard-seal valve)
