Quarter-turn Electrical Actuators
Product Overview
Quarter-turn electrical actuators are motor-driven devices used to automate the operation of valves or dampers that require a 90° rotational movement to open or close. These actuators convert electrical energy into mechanical torque to control the position of quarter-turn valves such as ball valves, butterfly valves, and plug valves.
They are widely used in industrial automation systems to improve operational efficiency, safety, and precision. Quarter-turn electric actuators can be integrated with control systems such as SCADA (Supervisory Control and Data Acquisition), PLC (Programmable Logic Controller), and DCS (Distributed Control System) for remote monitoring and control.
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How it works (simple explanation)
A quarter-turn electric actuator operates through the following basic steps:
- Electrical Signal Received – The actuator receives a command signal from a control system or manual switch.
- Motor Activation – An electric motor inside the actuator starts rotating.
- Gear Reduction – The motor rotation passes through a gearbox that increases torque and reduces speed.
- Output Shaft Rotation – The gearbox turns the output shaft 90° (quarter turn).
- Valve Operation – The shaft is connected to a valve stem, opening or closing the valve.
- Position Feedback – Limit switches or position sensors stop the actuator at the required position and send feedback to the control system.
This automated movement allows precise and reliable control of fluid flow.
What it measures
Quarter-turn electrical actuators themselves do not measure process variables but monitor and control valve position and actuator status.
Typical monitored parameters include:
- Valve position (open, closed, intermediate)
- Motor current
- Torque
- Actuator temperature
- Operational status (running, fault, standby)
- Travel limit position
Key advantages
- High Precision Control – Accurate valve positioning.
- Automation Ready – Easily integrates with PLC, SCADA, and DCS systems.
- Low Maintenance – Electric actuators require less maintenance compared to pneumatic systems.
- Energy Efficient – Power is consumed only during valve movement.
- Safe Operation – Eliminates need for compressed air systems.
- Remote Operation – Allows centralized monitoring and control.
- Compact Design – Suitable for space-constrained installations.
Applications
Quarter-turn electrical actuators are widely used in many industries:
- Oil & Gas pipelines
- Water and wastewater treatment plants
- Power generation facilities
- Chemical and petrochemical processing
- HVAC systems
- Food and beverage processing
- Marine and offshore installations
- Industrial automation systems
Typical controlled equipment includes:
- Ball valves
- Butterfly valves
- Plug valves
- Dampers
Installation
Proper installation ensures reliable performance and long service life.
Typical installation steps:
- Mounting
- Attach the actuator to the valve using an ISO 5211 mounting flange.
- Shaft Alignment
- Ensure the actuator output shaft is correctly aligned with the valve stem.
- Electrical Wiring
- Connect power supply and control wiring according to manufacturer specifications.
- Limit Switch Adjustment
- Set open and closed travel limits.
- Functional Testing
- Test actuator operation and verify correct valve movement.
- Integration with Control System
- Connect signals to PLC or SCADA system for remote monitoring.
Technical Specifications
Parameter | Specification |
Actuator Type | Quarter-Turn Electric |
Rotation Angle | 0° – 90° |
Output Torque Range | 50 Nm – 10,000 Nm |
Power Supply | 24 VDC / 110 VAC / 220 VAC / 380 VAC |
Motor Type | AC or DC Electric Motor |
Control Signal | On/Off, Modulating (4–20 mA or 0–10 V) |
Position Feedback | Limit switches / potentiometer / encoder |
Protection Rating | IP65 – IP68 |
Mounting Standard | ISO 5211 |
Operating Temperature | -20°C to +70°C |
Housing Material | Aluminum alloy / stainless steel |
Communication Protocol | Modbus, Profibus, HART (optional) |