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A power positioner is an apparatus that is positioned on the actuator and exerts or decreases air pressure as required to ensure that the valve is brought into the proper position.
In the absence of a power positioner, the actuator receives the control signal directly. Installed positioners intercept this signal and then send an alternative signal to the actuator. Power positioners improve the accuracy and speed of the actuator response, enabling more precise control over the process variable.
Because a power positioner’s duty is to ensure that the valve is in the proper location, it also aids in overcoming friction and other issues that can influence control valve performance, as well as deadband and non-linearity. Power positioners can also, if necessary, boost or reverse an input signal.
Positioners come in three different varieties: positioners that use air. The controller sends a pneumatic (air) signal to these components, which then send a pneumatic signal to the actuator.
Electro-pneumatic or analog positioners. In this instance, the input signal is electrical as opposed to pneumatic smart or digital positioners. A digital signal rather than an analog one is received by these positioners.
The Global Power Positioners market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
To properly and in reaction to a demand signal, industry needs muscle to regulate process valves, dampers, and feed mechanisms. In innumerable applications, from steel mills to refineries, where positioning speed and precision are taken for granted, Emerson’s Rosemount Analytical pneumatic power positioners have been meeting these stringent control requirements for many years.
Power positioners from Rosemount Analytical are produced in cylinder sizes ranging from 2-1/2 to 8 inches in diameter, with strokes ranging from 5 to 14 inches. For wall, swivel, or floor mounting, they are available in thrust and torque types.
They can also be customized with accessories like limit switches, position transmitters, heated enclosures, air failure locks, and characterized cams that provide motion that is a function of the input signal. The 2-1/2 x 5 positioner is tiny.
