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MINIMIZING FRICTION
Positioners minimize friction effects of valve stem packing and the resulting hysteresis. This is especially beneficial for high temperature packing materials like graphite.
INCREASES USAGE OF 4-20 mA ELECTRONIC SIGNALS
I/Ps can be located in the positioner that is on the valve.
ACCURACY
Positioners allow for fine control with better resolution and accuracy through full use of signal. This offsets the variation of the actuator’s range spring rate, which can vary ±8%.
INCREASED RESPONSE TIME
Positioners increase the response time to a change in the process. This allows for faster loading and venting.
NEGATES FLOW-INDUCED REACTIONS TO HIGHER PRESSURE DROPS
This compensates for internal force imbalances.
INCREASED FLEXIBILITY
Permits use of piston actuators with high instrument air supply pressures.
SELECTION OF ACTUATOR BENCHSET RANGES THAT AREN'T MATCHING
Positioners facilitate selection of actuator benchset ranges that aren’t “matching” or “multiple ratioing” from the signal. For example, using a 3-15 psig signal with a valve benchset of 10-35 psig signal. However, if the larger value of the benchset is above 15-18 psig, a positioner is technically required.
ALLOWS FOR SPLIT-RANGING
This gives you the ability to use one controller for two valves; 4-12 mA and 12-20mA.
CHARACTERIZATION CAMS
Positioners allow for incorporation of characterization cams to vary from the rotary control valve’s inherent character to a formed characteristic.
SEATING FRICTION
Overcomes seating friction effects at travel below 10%, allowing throttling near the “closed” position in a rotary control valve.
Valve positioners are available in three different configurations; pneumatic, analog I/P, and smart or digital positioners. Any of these would be a great addition to your system(s). The automation of a valve positioner will increase your plant efficiency, saving time and money while reducing downtime.
What else can I help you with?
whats the Construction of a Positioner Assembly?
Before going into the calibration process, it is important to understand the design of a positioner assembly. The following pointers will help you understand it better. The positioner assembly of a control valve consists of a flapper-nozzle, cam linkage, summing beam, and spring and a diaphragm interlinked together with the help of mechanical linkages. The summing beam is connected between the cam-spring linkage and the bellow. The action of cam-spring is directed by the pressure applied by the flapper-nozzle, which eventually triggers the motion of the summing beam. The diaphragm displays the applied and exerting pressure on/by the flapper assembly.
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