Japan Azbil yamatake valve positioner azbil avp300-rsd3a AVP100
AVP102 AVP300 AVP301 AVP302 AVP307
product description
The 300 Series receives a DC current signal from control devices
and controls pneumatic valves. In addition to this basic function, the 300 Series has
communication capabilities, automatic configuration program, and
self diagnostics functions that will greatly increase productivity
and the efficiency of plant operation. The model AVP301 has a valve travel transmitter function which
transmits a 4-20 mA DC signal. The model AVP302 has a HART communication protocol.
specification
| Brand name | Azbil |
| Model | AVP300-RSD3A |
| Output signal | 4～20mA |
| Supply air pressure | 140~700Kpa |
| Applicable actuator | Pneumatic single and double acting, linear and rotary motion
actuator |
| Flow characteristics | Linear, Equal percentage, Quick opening |
| Material | Cast aluminum |
| Color | Dark blue |
| Weight | 2.5kg |
Yamatake valve positioner working principle:
Yamatake valve positioner is the main control valve accessories, it
will stem the displacement feedback signal as the input signals, as
set in the controller output signal, comparing, when there is
deviation, change of its output signal to the actuator, the
actuator movement, the valve stem is established between the
displacement and the controller output signal to corresponding
relation. Therefore, the valve positioner consists of a feedback
control system with stem displacement as the measurement signal and
controller output as the setting signal. The control variable of
the control system is the output signal of the valve positioner to
the actuator.
① It is used for the important regulating system with high quality
requirements to improve the positioning accuracy and reliability of
the regulating valve.
② for both ends of the valve pressure difference (4p> 1MPa).
The output force of the actuator is increased by increasing the
pressure of the gas source to overcome the unbalanced force of the
liquid on the spool and reduce the stroke error.
③ when the medium is adjusted for high temperature, high pressure,
low temperature, toxic, flammable, explosive, in order to prevent
external leakage, often the packing is pressed very tightly, so the
friction between the stem and the packing is large, at this time
the positioner can overcome the time delay.
④ the medium is adjusted for viscous fluid or containing solid
suspended solids, the positioner can overcome the resistance of the
medium to the stem movement.
⑤ for large diameter (Dg> 100mm) control valve to increase
the output thrust of the actuator.
⑥ when the distance between the regulator and the actuator is more
than 60m, the positioner can overcome the transmission lag of the
control signal and improve the reaction speed of the valve.
⑦ to improve the meteor characteristics of the regulating valve.
⑧ when a regulator controls two actuators to implement range
control, two positioners can be used to accept low input signals
and high input signals respectively, then one actuator low range
action, the other elevation action, which constitutes range
regulation.
