(1) Used for important regulating systems with high requirements for regulating quality to improve the positioning accuracy and reliability of regulating valves.

　　(2) Used in situations where the pressure difference between the two ends of the valve is large (△ p>1MPa). By increasing the air source pressure and increasing the output force of the actuator, the imbalance force generated by the liquid on the valve core is overcome, and the stroke error is reduced.

　　(3) When the medium being adjusted is high temperature, high pressure, low temperature, toxic, flammable, or explosive, in order to prevent external leakage, the packing is often pressed tightly. Therefore, the friction between the valve stem and the packing is relatively large. At this time, using a locator can overcome the time delay.

　　(4) When the adjusted medium is a viscous fluid or contains solid suspended solids, using a locator can overcome the resistance of the medium to the movement of the valve stem.

　　(5) Used for regulating valves with large diameters (Dg>100mm) to increase the output thrust of the actuator.

　　(6) When the distance between the regulator and the actuator is over 60m, using a locator can overcome the transmission delay of the control signal and improve the valve's action response speed.

　　(7) Used to improve the flow characteristics of the regulating valve.

　　(8) When a regulator controls two actuators to implement split range control, two locators can be used to receive low input signals and high input signals respectively. If one actuator operates in low range and the other operates in elevation, it constitutes split range adjustment.

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