The electric soft-seal butterfly valve is an industrial valve that combines an electric actuator with a soft-seal structure. It uses electric power to achieve rapid opening and closing of pipeline media and flow regulation. It is widely used in water supply and drainage systems in industries such as water plants, power plants, steel plants, paper mills, chemicals, and food processing.
Structural Features
Valve Body and Connection Method
Nominal diameters range from DN50 to DN2000, supporting flange or wafer connections. The compact structure saves installation space.
Valve body materials include ductile iron, carbon steel, or stainless steel to suit various operating conditions.
Dish Plate and Sealing System
Soft Seal: Utilizes elastic materials such as nitrile rubber (NBR, applicable temperature -40℃~90℃), fluororubber (FKM, applicable temperature -20℃~200℃), or polytetrafluoroethylene (PTFE). Excellent sealing performance and low leakage are achieved, but temperature resistance is limited.
Double Eccentric Structure: The eccentric design reduces friction between the dish and seat, extending service life and providing a "tightening as it closes" sealing function.
Bidirectional Sealing: Installation is not restricted by the direction of media flow and can be installed in any direction.
Butterfly Plate: Circular or elliptical design, rotating around the valve stem axis (0°-90°) to control flow. Materials are mostly stainless steel or nylon-coated, offering corrosion resistance and high strength.
Sealing Method:
Electric Actuator
Driven by a motor, the rotary motion is converted into linear or rotary motion of the valve stem via a reducer, driving the butterfly plate to open and close.
Supports on/off type (fully open/fully closed) and regulating type (0°-90° stepless adjustment). Equipped with a control module, it can receive 4-20mA current signals or 0-10V voltage signals for remote automated control.
Protection level up to IP67, suitable for harsh environments.
Working Principle
- Opening Process: The electric actuator receives an opening signal, driving the motor to rotate. Through the reducer, it rotates the valve stem and butterfly plate 90°, aligning the butterfly plate parallel to the pipeline axis, allowing free flow of the medium.
- Closing Process: The electric actuator receives a closing signal, driving the motor to rotate in the opposite direction, rotating the butterfly plate perpendicular to the pipeline axis, blocking the flow of the medium.
- Flow Regulation: The regulating electric actuator can precisely control the opening of the butterfly plate according to the input signal, achieving stepless regulation of the media flow.
Performance Advantages
- Rapid Opening and Closing, Labor-Saving Operation: Full opening or closing can be achieved by rotating the butterfly plate 90°, with low operating torque and fast response.
- Excellent Sealing Performance: The soft sealing material has good fit and low leakage, conforming to GB/T13927-92 standard.
- Compact Structure, Easy Installation: The valve body is small and lightweight, saving installation space; the clamp-on connection provides reliable sealing and convenient maintenance.
- Strong Corrosion Resistance: The valve body can be made of stainless steel or coated with an anti-corrosion coating, suitable for corrosive media.
- High Degree of Automation: Supports remote control and automated operation, and can be integrated with DCS, PLC, and other control systems to achieve intelligent management.
- Large Flow Capacity: The butterfly plate adopts a frame structure, with a large flow area and low flow resistance, suitable for high flow conditions.
Applications
- Water Treatment Industry: Used for flow regulation and cutoff in sewage treatment and water supply pipelines, such as pump station outlets and pipeline branch control.
- Power Industry: Used for flow regulation in boiler feedwater and steam pipelines, such as turbine bypass systems and heater drain pipes.
- Petrochemical Industry: Used for precise control of media such as crude oil and chemical raw materials, such as reactor feeding and product diversion.
- Metallurgical Industry: Suitable for pipelines transporting high-temperature media (such as blast furnace gas and converter gas), such as dust removal systems and gas recovery pipelines.
- Other Industries: Widely used in textiles, papermaking, food, pharmaceuticals, shipbuilding, light industry, environmental protection, and other fields to meet fluid control needs under different operating conditions.