The role of the pneumatic pneumatic valve positioner and classification?

the function of pneumatic pneumatic valve positioner is accept pneumatic regulator output signal, and then produce and regulator output signal is proportional to the pressure signal, is used to control pneumatic pneumatic valve adjustment. A wide variety of pneumatic pneumatic valve positioner, according to its working principle can be divided into balance type displacement and force ( Moment) Balance type two kinds big.
the function of pneumatic pneumatic valve positioner is accept pneumatic regulator output signal, and then produce and regulator output signal is proportional to the pressure signal, is used to control pneumatic pneumatic valve adjustment.
is a wide variety of pneumatic pneumatic valve positioner, balance type according to its working principle can be divided into displacement and force ( Moment) Balance type two kinds big.