Valve
positioner also named pneumatic positioner valve , is the main
part of comtrol valve£¬in general, use with the pneumatic
positioner valve , It accepts the regulator output signal£¬than
comtrol the pneumatic control valve by it's output signal,£¬when
after control valve acting , the displacement of stem through
mechanical device feelback to valve positioner,£¬The
valve position status signals through signals pass to epistatic
systems.
¡¡The working principle of valve positioner as follow:
¡¡valve positioner is one of main part of comtrol
valve ,It is to stem displacement signal as the input signal measured
feedback,then to compare , when the totwo have deviation ,change
to the output signal of actuators£¬make the actuator
action, establish one-to-one mapping relation between stem displacement
and the controller output signal.As a result, valve positioner
composition is measured by displacements of the stem,£¬with
the controller outputs for setting signal feedback control systems.The
manipulated variables of feedback control system is output signals
that valve positioner to actuator.
¡¡The structure of valve positioner:
¡¡According to the structure and working principle
of the valve positioner, we usually divided into pneumatic valves
positioner, electric valves positioner and intelligent type valve
positioner three types.
¡¡The main characteristics of valve
positioner is increase the output power of comtrol valve , to
solve the problem that adjust the signal transmission lagged behind
, accelerate stem movement speed, valve linearity got bigger,
solve the stem of friction oversize and eliminate the excessive
unbalanced force, ensure correct positioning regulator.¡¡
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