The locator is the main accessory of the regulating valve, usually used in conjunction with pneumatic regulating valves. It receives the output signal of the regulator and then controls the pneumatic regulating valve with its output signal. When the regulating valve acts, the displacement of the valve stem is fed back to the locator through a mechanical device, and the valve position is transmitted to the upper system through an electrical signal.
The locator is the main accessory of the control valve. It takes the displacement signal of the valve stem as the feedback measurement signal and the output signal of the controller as the set signal for comparison. When there is a deviation between the two, it changes the output signal to the actuator to make the actuator move, establishing a one-to-one correspondence between the valve stem displacement multiple and the controller output signal. Therefore, the locator constitutes a feedback control system with valve stem displacement as the measurement signal and controller output as the set signal. The manipulated variable of this control system is the output signal from the locator to the actuator.
Electrical valve positioner regulates valve accessories
Selection of technical parameters
1. Action of actuator: L. Straight stroke, R angular stroke
2. Form of action: S single action, D double action
3. Input signal: 4-20mA signal
4. Explosion proof level: ExdII BT6 ExdII CT6 ExiaII CT6 Non explosion proof protection level IP66
5. Option: None
+PTM (built-in valve position feedback)
+PTM (External Valve Position Feedback)
+L/S (built-in limit switch)
+L/S (external limit switch)
+PTM+L/S (built-in valve position feedback and limit switch)
5 Characteristics: 1. High seismic resistance (no impact at 5-200Hz)
2. The electrical interfaces are all in a multi space form, making it easy to connect in any direction
3. Simple calibration and easy implementation of the conversion between positive and negative effects
4. For small actuator mechanisms, vibration can be eliminated by adjusting the air hole flow rate
5. Half split control can be completed without changing parts
6. Designed as a component combination structure for easy maintenance and upkeep
7. Easy to provide feedback links
8. Low air consumption
Application industries: chemical industry, power plants, paper and glass, food and pharmaceuticals, etc
