Linear stroke positioner

◆ Locator:

YT-1000R, YT-1000L, YT-1200R, YT-1200L

◆ Overview:

Valve positioners, classified by structure into pneumatic valve positioners, electro-pneumatic valve positioners and intelligent valve positioners, are the main accessories of control valves and are usually used in conjunction with pneumatic control valves. They accept the output signals from the regulator and then control the pneumatic control valve with their output signals. When the control valve operates, the displacement of the valve stem is fed back to the valve positioner through a mechanical device. The valve position status is transmitted to the upper-level system via electrical signals.

◆ Working principle:

The valve positioner is a major accessory of the control valve. It takes the valve stem displacement signal as the input feedback measurement signal and the controller output signal 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 act, establishing a one-to-one correspondence between the valve stem displacement and the controller output signal. Therefore, the valve positioner forms a feedback control system with the displacement of the valve stem as the measurement signal and the output of the controller as the setting signal. The operating variable of this control system is the output signal of the valve positioner to the actuator.

◆ Compatible varieties:

Common actuators are classified into pneumatic actuators and electric actuators, and they can be further divided into linear stroke and angular stroke types. It is used for automatically or manually opening and closing various valves, air dampers, etc.