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How is the direct and reverse action of a smart valve positioner distinguished?
Release time:
2026-04-07 15:22
Perhaps everyone is familiar with Smart Valve Positioner We may not know much about it, but that’s perfectly fine—let the editor walk you through it and show you how the distinctions are made. Let’s take a look at everything this chapter has to offer.
A positive action occurs when an increase in the control signal causes the valve stem to move downward, whereas a negative action occurs when the same increase causes the valve stem to move upward. The valve positioner is a key accessory for control valves and is typically used in conjunction with pneumatic control valves. The pneumatic control valve is then governed by its output signal; as the valve moves, a mechanical linkage feeds back the stem displacement to the valve positioner. The valve’s position status is transmitted to the higher-level system via electrical signals.
The smart valve positioner requires no manual adjustment; it automatically detects the control valve’s zero point, full-scale range, and friction coefficient, and then automatically sets the positioner’s control parameters. The valve opening (stem travel) is determined by the combined effect of the signal pressure and the spring force. In theory, the stem position should correspond to the equilibrium between these two forces.
However, in practical applications, other forces come into play, primarily the frictional force on the valve stem and the thrust exerted by the process fluid on the valve plug. These factors cause the valve opening to deviate from its theoretical position. A valve positioner can be regarded as a servo control system in which the control signal serves as the setpoint and the mechanical feedback of the valve stem displacement acts as the measured variable, thereby maintaining the desired functional relationship between the valve opening and the control signal. The foregoing is the distinction we have outlined; we hope it will prove helpful.
2020-01-19
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