The electric actuated butterfly valve is a combination of a quarter-turn butterfly valve and an electric actuator which helps open, close, or position the valve remotely. The actuator used depends on torque, size, pressure, and control needs.The which is Speciality Valve offers configurations for water, wastewater, power, chemical, oil and gas, and industrial utility applications.
Technical Details and Configuration
The complete valve assembly can be specified according to the pipeline and electrical requirements.
- Nominal Size: DN50 - DN1200, according to design
- Rating Pressure: PN10, PN16, PN25 ASME Class 150, according to valve type
- Valve Type: Centric, Double Offset or other Butterfly designs
- Operation: Electric quarter-turn
- Actuator Type: On-off, modulating or intelligent
- Rotation: 90 degrees
- End Connections: Wafer, lugged or double flanged
- Mounting: ISO 5211 where applicable
- Power Supply: 24 V DC, 24 V AC, 110 V AC, 220/230 V AC or 380/400/415 V AC
- Frequency: 50 Hz or 60 Hz
- Phase: Single-phase or three-phase
- Control Signal: On-off, 4 to 20 mA or 0 to 10 V
- Protection: IP67, with IP68 available for selected actuators
- Ambient Temperature: Approximately minus 20 degrees C to plus 70 degrees C, actuator dependent
- Actuator Torque: Selected according to valve size, differential pressure and seating load
Materials Used in Construction
Material selection depends on the fluid, temperature, pressure and corrosion conditions of the installation.
- Body: Cast Iron, Ductile Iron, Carbon Steel, CF8 or CF8M
- Disc: Stainless Steel, CF8, CF8M, Duplex Stainless Steel or Aluminium Bronze
- Stem: SS420, SS431, SS304, SS316 or 17-4 PH
- Seat: EPDM, NBR, PTFE, FKM or metal seat
- Bearings: PTFE type or other material as specified for low
- Coating: Fusion-bonded epoxy or other protective coating
Electric Actuator Options
The actuator can be equipped with features suited to the way the valve will be operated in the plant.
- On-Off Actuation: Remote opening and closing
- Modulating Actuation: Intermediate valve positioning for flow regulation
- Manual Override: Allows operation during power loss or maintenance
- Limit Switches: Provides open and closed position indication
- Position Feedback: Potentiometer or 4 to 20 mA feedback where required
- Local Controls: Open, stop and close controls on compatible actuators
- Torque Protection: Protects against excessive operating load
- Fail-Safe Options: Battery-backed or other emergency positioning arrangements where specified
- Communication: Modbus and other digital communication options on compatible intelligent actuators
Performance Features
- Quarter-turn operation for relatively quick valve movement
- Remote operation from control panels or automation systems
- On-off and modulating configurations
- Defined travel limits through the electric actuator
- Valve position indication
- Bi-directional sealing in applicable designs
- Compact arrangement compared with many multi-turn valve assemblies
- Suitable for indoor or outdoor installation with appropriate enclosure protection
- Actuator torque matched to the valve operating load
Typical Industrial Services
Electric actuated butterfly valves are commonly used where remote operation or automated isolation is required.
- Water Treatment: Automated isolation across treatment and distribution lines
- Wastewater Plants: Isolation around treatment and pumping equipment
- Power Generation: Cooling-water and utility systems
- Oil and Gas: Compatible process and utility pipelines
- Chemical Processing: Automated isolation of compatible process fluids
- Desalination: Seawater and treated-water services
- Marine Systems: Cooling-water and utility applications
- Industrial Utilities: Automated handling of water, air and compatible fluids
The correct electric actuator is determined by valve torque, power supply, control signal, operating mode and environmental conditions. For automated pipeline requirements, Speciality Valve, the best offers configurations suited to different industrial services.
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