Rotex and Rotork valve positioners for precise process control applications
Positioners & Actuators Fundamentals:
- Actuators are devices that move valves (linear or rotary) using pneumatic or electric power. They take a control signal and physically change the valve's position.
- Positioners are control accessories mounted on actuators. They ensure the valve's actual position exactly matches the controller's command signal (e.g., 4-20 mA), improving accuracy and response.
- Applications: Essential in process control (oil & gas, power, pharma, chemical industries) to regulate flow, pressure, temperature, etc.
- Signal: 3-15 psi pneumatic
- Power: Compressed air only
- Accuracy: ±1% of span
- Applications: Basic process control
- Signal: 4-20 mA electrical
- Power: Air + 24V DC
- Accuracy: ±0.5% of span
- Applications: Modern DCS systems
- Signal: Digital protocols
- Power: Air + 24V DC
- Accuracy: ±0.2% of span
- Applications: Advanced process control
Rotex Key Products:
- Rotex RTX1000 Electro Pneumatic Valve Positioner - High accuracy positioning
- Rotex Make 90° Rotary Pneumatic Actuator - Quarter-turn valve operation
- Rotex Pneumatic Actuators - Various sizes and torque ratings
- Rotex Accessories - Limit switches, solenoid valves, position transmitters
Rotex Features:
- High positioning accuracy
- Robust construction for harsh environments
- Easy calibration and setup
- Low air consumption
- Wide temperature range operation
Key Features:
- Input Signal: 3-15 psi pneumatic
- Supply Pressure: Up to 7 bar
- Accuracy: ±1% of span
- Mounting: Direct or reverse acting
Applications:
- Basic control valves
- Oil & gas applications
- Water treatment plants
- Power generation
YT-1000 Series:
- Input: 4-20 mA
- Accuracy: ±0.5%
- Response: Fast
- Display: Analog
YT-1050 Series:
- Input: 4-20 mA with HART
- Accuracy: ±0.25%
- Diagnostics: Basic
- Display: Digital LCD
Common Features:
- IP66/67 protection
- Wide temperature range
- Intrinsic safety options
- Easy calibration
| Series |
Model Numbers |
Key Features |
Communication |
Applications |
| Basic Smart |
YT-2500, YT-2550 |
LCD display, Basic diagnostics |
4-20 mA + HART |
General process control |
| Advanced Smart |
YT-2501, YT-2600 |
Advanced diagnostics, Data logging |
HART, Foundation Fieldbus |
Critical processes |
| High Performance |
YT-3300, YT-3301, YT-3303 |
High accuracy, Fast response |
Multiple protocols |
Precision control |
| Special Series |
YT-3100, YT-3400, YT-3450 |
Special applications |
Various options |
Special environments |
| Latest Generation |
YT-3700/3750 |
Wireless, IoT ready |
WirelessHART, IoT |
Modern plants |
Pneumatic Actuators
- Types: Piston, Diaphragm, Rotary vane
- Power: Compressed air (4-7 bar)
- Speed: Fast response
- Applications: Most process valves
- Fail-safe: Spring return, air-to-open/close
Electric Actuators
- Types: Quarter-turn, Multi-turn, Linear
- Power: 24V DC, 110/220V AC
- Control: On/off, Modulating
- Applications: Remote locations, No air supply
- Features: Position feedback, Torque limiting
- Motion: Straight line push/pull
- Stroke: 10mm to 500mm+
- Force: Up to 50,000 N
- Valves: Globe, Gate, Diaphragm
- Motion: 90° rotation
- Torque: 10 Nm to 10,000 Nm
- Speed: 1-30 seconds/90°
- Valves: Ball, Butterfly, Plug
- Motion: Multiple rotations
- Torque: High torque output
- Speed: 10-100 rpm
- Valves: Gate, Globe, Control
Positioner & Actuator Selection Guide
Key Selection Parameters:
- Valve Type: Linear, Rotary quarter-turn, Multi-turn
- Power Source: Pneumatic, Electric, Hydraulic
- Control Signal: 4-20 mA, 3-15 psi, Digital
- Speed/Response: Required stroking speed
- Force/Torque: Required to operate valve
Special Considerations:
- Fail-safe: Fail-open, Fail-closed, Locked
- Environment: Temperature, Corrosion, Hazardous area
- Smart Features: Diagnostics, Communication, Data logging
- Maintenance: Accessibility, Service requirements
- Mounting: Direct, Reverse, Side-mounted
Application Matrix:
| Industry |
Recommended Positioner |
Actuator Type |
Special Requirements |
| Oil & Gas |
YT-3300 Smart Digital |
Pneumatic with spring return |
ATEX certified, High reliability |
| Power Generation |
YT-1050 Electro-Pneumatic |
Electric modulating |
High temperature, Fast response |
| Chemical Process |
YT-2500 Smart Positioner |
Pneumatic diaphragm |
Corrosion resistant, Precise control |
| Water Treatment |
YT-1200 Pneumatic |
Electric on/off |
IP68 protection, Low maintenance |
| Pharmaceutical |
YT-3400 Sanitary |
Electric with feedback |
Clean design, Easy cleaning |
