What are the classifications of valve positioners? The following editor will give you a specific introduction.

According to the direction of action, it can be divided into one-way valve positioner and two-way valve positioner. When the one-way valve positioner is used in a piston type actuator, the valve positioner only works in one direction, and the two-way valve positioner acts on both sides of the cylinder of the piston type actuator and works from two directions.

According to the gain sign of the valve positioner output and input signal, it is divided into positive acting valve positioner and reverse acting valve positioner. When the input signal of a positive-acting valve positioner increases, the output signal also increases, so the gain is positive. When the input signal of the counteracting valve positioner increases, the output signal decreases, so the gain is negative.

According to the input signal of the valve positioner is analog signal or digital signal, it can be divided into ordinary valve positioner and fieldbus electric valve positioner. The input signal of ordinary valve positioner is analog air pressure or current, voltage signal, and the input signal of field bus electrical valve positioner is the digital signal of field bus.

According to whether the valve positioner has CPU or not, it can be divided into ordinary electric valve positioner and intelligent electric valve positioner. Ordinary electric valve positioners do not have a CPU, so they are not intelligent and cannot process related intelligent calculations. The intelligent electric valve positioner has a CPU, which can process related intelligent calculations, for example, it can perform nonlinear compensation of the forward channel, and the fieldbus electric valve positioner can also be equipped with PID and other functional modules to realize the corresponding calculations.