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작성자애드마왕 조회 1회 작성일 2022-06-29 04:28:09 댓글 0

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What are Valve Positioners?

Learn about the basic functionality and overall benefits to using valve positioners.
luis humberto ruiz betanzos : Los posicionadores, como los que ve aquí, son dispositivos que nos permiten regular con precisión la válvula de control en el punto de ajuste deseado. Muchos estilos están disponibles dependiendo del tipo de válvula de control que tenga. Todos los posicionadores requieren dos cosas para su correcto funcionamiento, entrada y retroalimentación. Inputo es la señal de control que proporciona un punto de ajuste. La retroalimentación indica la posición actual de la válvula. Echemos un vistazo más de cerca a la posición u operación en esta animación. La entrada es proporcionada por una señal de control neumático a un fuelle. A medida que aumenta la entrada, el fuelle se expandirá y actuará sobre una viga. La viga gira y mueve la aleta en reacción a una boquilla a medida que la aleta en relación con una boquilla a medida que la posición de la aleta ha cambiado, la presión de la boquilla cambia y opera un relé neumático. En este punto, simplemente tenemos un transductor de presión a presión para la entrada. Para convertirlo en un posicionador debemos tener comentarios. La retroalimentación asegura que la válvula de control está respondiendo a la entrada y que la posición de la válvula corresponde a la señal de entrada dada. En esta animación, los componentes mecánicos proporcionan la retroalimentación desde la válvula de control al posicionador. Estamos utilizando un accesorio de leva a un brazo que gira a medida que la válvula se mueve. La retroalimentación también en el haz y es una fuerza opuesta a la señal de entrada en el fuelle. Si se realiza un aumento en la entrada al dispositivo, el fuelle volverá a accionar el rayo y moverá el rayo y acercará la aleta a la boquilla. A medida que aumentan las presiones de la boquilla y la salida, la válvula se mueve y la retroalimentación de la leva actúa en el lado opuesto de la viga, alejando la aleta de la boquilla. La viga es un componente sumador. Tanto la entrada como la retroalimentación se aplican al haz de suma y al área constantemente comparadas entre sí. Si las fuerzas son iguales, la relación de la boquilla y la aleta permanece estable y la presión de salida del dispositivo es constante. La posición de la válvula se mantiene. Si se produjera un cambio en una de las fuerzas, la aleta se ajusta nuevamente en relación con la boquilla y la presión de salida cambia hasta que ambas fuerzas cambien hasta que ambas fuerzas se vuelvan a igualar. Si se realiza un aumento en la entrada al dispositivo, el fuelle volverá a accionar el rayo y moverá el rayo y acercará la aleta a la boquilla. A medida que aumentan las presiones de la boquilla y la salida, la válvula se mueve y la retroalimentación de la leva actúa en el lado opuesto de la viga, alejando la aleta de la boquilla. La viga es un componente sumador. Tanto la entrada como la retroalimentación se aplican al haz de suma y al área constantemente comparadas entre sí. Si las fuerzas son iguales, la relación de la boquilla y la aleta permanece estable y la presión de salida del dispositivo es constante. La posición de la válvula se mantiene. Si se produjera un cambio en una de las fuerzas, la aleta se ajusta nuevamente en relación con la boquilla y la presión de salida cambia hasta que ambas fuerzas cambien hasta que ambas fuerzas se vuelvan a igualar. Si el posicionador está calibrado adecuadamente, la posición de la válvula corresponderá a una señal de control dada. Por ejemplo, en esta animación se usa una señal de control de 3 a 15 PSIG para la entrada. A 3 psig nuestra válvula está completamente abierta, a 9 psig el recorrido será del 50% y a 15 psig la válvula está completamente cerrada. El posicionador le da a la válvula de control la capacidad de superar la fricción de la válvula y la fuerza del proceso que puede causar desviaciones de posición. Existen muchos beneficios adicionales al usar el posicionador de la válvula de control además de la posición del vástago. Los posicionadores de precisión a menudo se seleccionan para lograr el control de la aceleración de los actuadores de pistón, para acomodar señales de control no compatibles, para asegurar el cierre adecuado de la válvula de control, para permitir el rango de rango dividido y para cambiar la característica de ganancia de la válvula de control.
luis humberto ruiz betanzos : The feedback ensures that the control valve is responding to the input And that the valve position corresponds to the given input signal. In this animation the feedback is provided from the control valve to the positioner by mechanical components
Pasi Rahko : Great video. Well explained how control valve positioners work and the benefits of using them. Many thanks.
luis humberto ruiz betanzos : Positioners, like the ones you see here, are devices that allow us to accurately throttle the control valve at a desired setpoint. Many styles are available depending on the type of control valve you have. All positioners requiere two things for proper operation, input and feedback. Input is the control signal that provides a set point. Feedback indicates the current valve position. Let's take a closer look at position or operation in this animation. Input is provided by a pneumatic control signal to a bellows. As input is increased the bellows will expanded and act on a beam. The beam pivots and moves flapper in reaction to a nozzle as the flapper in relation to a nozzle as the flapper position has changed the nozzle pressure changes and operates a pneumatic relay. At this point we simply have a pressure to pressure transducer for input. To make it a positioner we must have feedback. The feedback ensures that the control valve is responding to the input and that the valve position corresponds to the given input signal. In this animation the feedback is provided from the control valve to the positioner by mechanical components. We're using a cam attachment to an arm that rotates as the valve strokes. The feedback also on the beam and is an opposing force to the input signal in the bellows. If an increased in input is made to the device, the bellows will again action the beam and move the beam and move the flapper closer to the nozzle. As nozzle and output pressures increase, the valve moves and feedback from cam acts on the opposite side of the beam moving the flapper away from the nozzle. The beam is summing component. The input and the feedback are both applied to the summing beam and area constantly compared to each other. If the forces are equal, the nozzle and the flapper relationship remains stable and the output pressure from the device is constant. The valve position is then maintained. If a change to one of the forces should occur, the flapper is again adjusted in a relation to the nozzle and output pressure change until both forces are change until both forces are once again equalized. If the positioner is properly calibrated, the valve position will correspond to a given control signal. For example, in this animation a 3 to 15 PSIG control signal is used for the input. At 3 psig our valve is fully open, at 9 psig travel will be 50% and at 15 psig the valve is fully closed. The positioner gives the control valve the ability to overcome valve friction and process force thet may cause position deviations. There are many additional benefits to using control valve positioner other than just stem position. Accuracy postioners are often selected to achieve throttling control of piston actuators, to accommodate non-compatible, control signals, to ensure proper shut off of the control valve, to enable split range ranging, and to change the gain characteristic of the control valve.
Mathew Carmichael : Another great video. That was an excellent visual animation of the feedback cam and flapper/nozzle relationship for a 3582.

How Pneumatic Control Valve Works | Control Valve Actuator Types | Control Valve Positioner Types

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What is a Control Valve and How does it Work? We would almost always like to have control over different parameters of the process like temperature, pressure, level, and so on.

To achieve this, obviously, we need a controller like Programmable Logic Controller or PLC for short.

We also need some sensors and transmitters to send data over to PLC. Finally, we need a piece of equipment to carry out the PLC’s commands which usually called “Final Control Element.” A Final Control element can be a pump, a heater, a control valve, and so on.

In this video, we will learn about the control valves, their operation mechanism, and components in an easy-to-understand method.

After this video, you'll have a great understanding of:

➡ Control valve basics (What are control valve components?)
➡ Most applicable control valves in the industry (such as globe valves)
➡ How Pneumatic Control Valve works
➡ Control valve actuator types
➡ Control valve positioner types
➡ I to P transducers (or I to P converters) and their applications

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SECTIONS of this video:

0:00 what is a Final Control Element? (Control valve as a Final Control Element)
1:07 what are control valve applications?
1:40 control valve components
2:40 control valve application example
3:39 what is an Electro-Pneumatic Positioner?
4:11 how an Electro-Pneumatic Positioner works
6:10 control valve positioner types
7:15 digital control valve positioner advantages
7:48 standalone I to P transducer
8:06 schematic of different types of positioners
8:16 control valve actuator types and their advantages

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What is a Directional Control Valve? (5/2 Solenoid Valve)
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DCS vs PLC: 5 Important Differences between PLC and DCS
https://upmation.com/plc-vs-dcs/

NO vs NC: 5 Practical and Important Points about NO and NC contacts
https://upmation.com/no-and-nc/

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#IndustrialAutomation #ControlValve #ControlValveParts
Roel Joseph Cruz : This video deserves an oscar nomination, really simple and straight-forward explanations! Hope to see you guys making more video like this in the future. Thank you!
MD Shabeer Ahmed : Good explanation, I have a question, how the pump starts, if the control valve is 30% open will run at full speed or it will bypass the liquid through by pass line
Harish Menon R : I am an instructor in the instrumentation field.
Amazing presentation with simple and powerful animations.
Eagerly waiting for new videos and Lot to study from you sir.
Łukasz Wieczorek : Thanks for this. I was about to compare difference in P&ID notation, and according to this, there are always three lines to the valve: pneumatic supply, electric, software link or penumatic controller line, and postioner-actuator feedback signal. Cannot really understand why all control valve sets are shown with two only- without supply line.
Harish Menon R : Need classes on different types of transmitters for flow, pressure, level etc.
Very good presentation. Simple and powerful too

파워제넥스 포지셔너 켈리브레이션

EP POSITIONER CALIBRATION
EP 포지셔너 켈리브레이션 방법

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#positioner

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