Electric pneumatic valve positioner

electric pneumatic valve positioner is a major attachment of pneumatic control valve, pneumatic valve stem it will displacement signal as the input of the feedback signal, as set in the controller output signal, comparing, when there is deviation, change of its output signal to the actuator, the actuator, pneumatic valve rod displacement is established and the corresponding relation between the controller output signal. The small make up to introduce the electric pneumatic valve positioner.
, electric pneumatic valve positioner is to adjust the control system of high quality requirements, need to improve the positioning accuracy and increase the reliability of the pneumatic valve adjustment.
, installation is on both ends of the pneumatic valve differential pressure is greater than the MPa. Air pressure is increased by increase the output force, starter, overcome the fluid on the vision of the pneumatic valve core force reduce the error in the trip.
, in order to avoid external leakage, when the flow fluid contained in the high temperature and high pressure, low temperature, toxic, flammable, explosive and other state will often filler extrusion was sealed, the use of pneumatic friction between stem and packing increases, at this time with a locator can overcome the time delay.
, when fluid viscous fluid containing suspended solid or fluid, the use of pneumatic valve positioner can reduce fluid lever moving resistance.
and locator also has overcome the control signal transmission lag, improves the response speed of movement of pneumatic valve.
and improve regulating the flow of the pneumatic valve flow characteristics.
, when a single regulator control two actuators can be used when the locator, as a low routine action, another height. Accept low input signal and high input signal respectively, achieving the process control mode.