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Pneumatic valve positioner classification | | effect principle
by：AIRWOLF
2020-10-14
Pneumatic valve positioner classification, principle of the pneumatic valve positioner, pneumatic valve positioner role
pneumatic valve positioner is one of the electric pneumatic pneumatic valve accessories, is a major attachment of pneumatic actuator, pneumatic valve positioning effect. Pneumatic valve positioner and electric actuator constitute control unit and after commissioning the installation, all kinds of pneumatic valve will be assembled into electric pneumatic valve, pneumatic valves or used in a variety of industrial automation of the process control field.
【 Pneumatic valve positioner classification 】 According to the structure:
pneumatic pneumatic valve positioner, electric pneumatic valve positioner and intelligent pneumatic valve positioner.
according to the direction of the action:
one-way pneumatic valve positioner and two-way pneumatic valve positioner. One-way pneumatic valve positioning is used in piston type actuators, pneumatic valve positioner is only one direction, two-way pneumatic valve positioner effects on both sides of the piston cylinder actuator, in both directions.
symbol on signal:
are action pneumatic valve positioner and reaction of pneumatic valve positioner. Pneumatic valve positioner is role of the input signal increases, the output signal will increase, therefore, the gain is positive. Reaction of pneumatic valve positioner of the input signal increases, the output signal decreases, and thus, gain is negative.
according to the input signal difference:
ordinary pneumatic valve positioner and field bus electric pneumatic valve positioner. Ordinary pneumatic valve positioner of the input signal is to simulate air pressure, voltage or current signal, the fieldbus input signal of electric pneumatic valve positioner is fieldbus digital signal.
according to the functional difference:
ordinary electric pneumatic valve positioner and intelligent electric pneumatic valve positioner. General electric pneumatic valve positioner no CPU, therefore, do not have intelligence, can't handle the intelligent operation. Intelligent electric pneumatic valve positioner with CPU, can handle the relevant intelligence operations, for example, can be carried out prior to passage of the nonlinear compensation, such as field bus electric pneumatic valve positioner can also function modules, such as PID implement corresponding operation.
【 Working principle of the pneumatic valve positioner.
pneumatic valve positioner accept regulator output signal, and then the controller output signal proportional to the output to the actuator. Pneumatic valve stem when mobile later, its displacement child through mechanical device negative feedback effect on pneumatic valve positioner, so it is with actuators to form a closed loop system. Accept control system or controller command signal ( It is commonly 4 ~ 20 ma) , through internal electrical switching device, the input source signal into the pressure of the pneumatic valve actuator required, so that the pneumatic valve open to the corresponding position. In the process of output pressure pneumatic valve action, as a result of the existence of the locator feedback pole, detect whether locator action in place, after putting in place the locator will be according to the feedback stable output pressure, which have the effect of positioning.
electric pneumatic valve positioner of the input signal is the standard current or voltage signal, for example, 4 ~ 20 ma current signal or 1 ~ 5 v voltage signal, etc. , within the electric pneumatic valve positioner converts electrical signals to electromagnetic force, and then the output signal to toggle pneumatic control valve.
smart electric pneumatic valve positioner it will control pneumatic valve to adjust output current signal is converted to drive the gas signal, according to the regulation of pneumatic valve pneumatic valve stem friction at work, the unbalanced force of medium pressure fluctuations, pneumatic valve opening corresponding to the control room of the output current signal. And the corresponding parameters can be set of intelligent configuration, reach the purpose of improving control pneumatic valve performance.
【 Pneumatic valve positioner role 】
( 1) Increase the thrust of the actuator. ( 2) To speed up the movement of the actuator. ( 3) Improve the adjusting flow rate characteristics of pneumatic valve.
( 4) Its realization process control. Process and control, two locator manipulation by a regulator, each locator work interval is determined by the relay point.
in addition to the above, the locator can make actuators by two action proportional action, can change to adjust the action of pneumatic valve form, or the need for electricity in the transform composite control.
related products: pneumatic regulating pneumatic ball valve pneumatic butterfly valve
pneumatic valve positioner is one of the electric pneumatic pneumatic valve accessories, is a major attachment of pneumatic actuator, pneumatic valve positioning effect. Pneumatic valve positioner and electric actuator constitute control unit and after commissioning the installation, all kinds of pneumatic valve will be assembled into electric pneumatic valve, pneumatic valves or used in a variety of industrial automation of the process control field.
【 Pneumatic valve positioner classification 】 According to the structure:
pneumatic pneumatic valve positioner, electric pneumatic valve positioner and intelligent pneumatic valve positioner.
according to the direction of the action:
one-way pneumatic valve positioner and two-way pneumatic valve positioner. One-way pneumatic valve positioning is used in piston type actuators, pneumatic valve positioner is only one direction, two-way pneumatic valve positioner effects on both sides of the piston cylinder actuator, in both directions.
symbol on signal:
are action pneumatic valve positioner and reaction of pneumatic valve positioner. Pneumatic valve positioner is role of the input signal increases, the output signal will increase, therefore, the gain is positive. Reaction of pneumatic valve positioner of the input signal increases, the output signal decreases, and thus, gain is negative.
according to the input signal difference:
ordinary pneumatic valve positioner and field bus electric pneumatic valve positioner. Ordinary pneumatic valve positioner of the input signal is to simulate air pressure, voltage or current signal, the fieldbus input signal of electric pneumatic valve positioner is fieldbus digital signal.
according to the functional difference:
ordinary electric pneumatic valve positioner and intelligent electric pneumatic valve positioner. General electric pneumatic valve positioner no CPU, therefore, do not have intelligence, can't handle the intelligent operation. Intelligent electric pneumatic valve positioner with CPU, can handle the relevant intelligence operations, for example, can be carried out prior to passage of the nonlinear compensation, such as field bus electric pneumatic valve positioner can also function modules, such as PID implement corresponding operation.
【 Working principle of the pneumatic valve positioner.
pneumatic valve positioner accept regulator output signal, and then the controller output signal proportional to the output to the actuator. Pneumatic valve stem when mobile later, its displacement child through mechanical device negative feedback effect on pneumatic valve positioner, so it is with actuators to form a closed loop system. Accept control system or controller command signal ( It is commonly 4 ~ 20 ma) , through internal electrical switching device, the input source signal into the pressure of the pneumatic valve actuator required, so that the pneumatic valve open to the corresponding position. In the process of output pressure pneumatic valve action, as a result of the existence of the locator feedback pole, detect whether locator action in place, after putting in place the locator will be according to the feedback stable output pressure, which have the effect of positioning.
electric pneumatic valve positioner of the input signal is the standard current or voltage signal, for example, 4 ~ 20 ma current signal or 1 ~ 5 v voltage signal, etc. , within the electric pneumatic valve positioner converts electrical signals to electromagnetic force, and then the output signal to toggle pneumatic control valve.
smart electric pneumatic valve positioner it will control pneumatic valve to adjust output current signal is converted to drive the gas signal, according to the regulation of pneumatic valve pneumatic valve stem friction at work, the unbalanced force of medium pressure fluctuations, pneumatic valve opening corresponding to the control room of the output current signal. And the corresponding parameters can be set of intelligent configuration, reach the purpose of improving control pneumatic valve performance.
【 Pneumatic valve positioner role 】
( 1) Increase the thrust of the actuator. ( 2) To speed up the movement of the actuator. ( 3) Improve the adjusting flow rate characteristics of pneumatic valve.
( 4) Its realization process control. Process and control, two locator manipulation by a regulator, each locator work interval is determined by the relay point.
in addition to the above, the locator can make actuators by two action proportional action, can change to adjust the action of pneumatic valve form, or the need for electricity in the transform composite control.
related products: pneumatic regulating pneumatic ball valve pneumatic butterfly valve
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